The CCIE RS coaching is carried out at CCIE coaching universities, which has tutors, lecturers, and boot camps. Within just the CCIE, you will discover 6 tracks, notably, Storage Networking, Voice and Wi-fi, Routing & Switching, Service Provider, and Security. This examination is considered to be quite tough and excellent one to clear, providing you with technical experience and dedication. This also makes you a member of an exclusive group of pros, makes your resume look grand, and will increase your credibility.

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After receiving the CCIE RS coaching, you might be assumed of to be an knowledgeable in the networking field. Subsequently, if a tough scenario arises, you might be at all times called in to settle the problem. When you will have this certification, you may be acknowledged worldwide for having high qualification inside of the networking and technology industry.

It's essential to understand the general means of CCIE RS coaching examination, so that you will understand the form of exercise which can be needed. This examination consists of two principal elements, the written, and the lab exam. The written half is of two hours size containing a number of-choice question. You'll be able to sit for the lab examination only if you are successful in the written test. The lab examination is an eight-hour one that can take a look at your capacity to put collectively networking and software equipment and your troubleshooting ability. Three years are provided for passing the lab examination, after which you must have to reappear for the written exam before continuing for the lab examination again.

A lot of the candidates showing for your CCIE RS exercise examination do not go on the first attempt. Nonetheless, there is fairly a high price of success in the second attempt. To enhance the probabilities of success in this exam, you should research the subjects that are exam specific. One essential issue to be kept in thoughts is that, after receiving this certificate, you should recertify each two years.

Consider researching concerning the expertise in every area as listed within just the Cisco blueprint. It is actually recommended to have not less than four hundred hours of lab follow utilising a simulated gear as a way for you to succeed within the CCIE security lab exam. Dedicate a part of your day in mastering every topic. You'll find various study materials obtainable available in the market for better understanding of the subjects talked about inside of the blueprint of Cisco. They assist you to in making ready yourself by way of the aid of structured software. You'll be able to spend money on a good workout software, which lets you improve your degree of expertise.

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Router1(config)#crypto isakmp policy 10

Router1(config-isakmp)#encr aes 256

Router1(config-isakmp)#authentication pre-share

Router1(config-isakmp)#group 2

This policy uses 256-bit AES encryption, preshared authentication keys, and group 2 (1024 bit) for Diffie-Hellman (DH) exchange. If we did not configure this, the routers would have to resort to the default parameters, which are 56-bit DES encryption, Rivest Shamir Adleman (RSA) signatures for authentication, and DH group 1 (768 bit). You can see the available policies on a router with the show crypto isakmp policy command:

Router1#show crypto isakmp policy

Global IKE policy

Protection suite of priority 10

        encryption algorithm:   AES - Advanced Encryption Standard (256 bit keys

).

        hash algorithm:         Secure Hash Standard

        authentication method:  Pre-Shared Key

        Diffie-Hellman group:   #2 (1024 bit)

        lifetime:               86400 seconds, no volume limit

Default protection suite

        encryption algorithm:   DES - Data Encryption Standard (56 bit keys).

        hash algorithm:         Secure Hash Standard

        authentication method:  Rivest-Shamir-Adleman Signature

        Diffie-Hellman group:   #1 (768 bit)

        lifetime:               86400 seconds, no volume limit

Router1#

We could have also adjusted the hash algorithm and the lifetime of a particular SA as follows:

Router1(config)#crypto isakmp policy 20

Router1(config-isakmp)#hash md5

Router1(config-isakmp)#lifetime 600

This policy uses the somewhat less secure but faster MD5 hash algorithm and reduces the SA lifetime to 600 seconds (10 minutes). The default hash algorithm is the standard IPSec Secure Hash Algorithm (SHA), and the default lifetime is 86400 seconds (24 hours). Reducing the lifetime forces the routers to renegotiate the various SA parameters, including encryption keys, more frequently. This frequent renegotiation improves security, but at the expense of higher router CPU utilization and possible delays during the renegotiation process.

Then, because we have configured the routers to use pre-shared keys in this policy, we need to define this initial key with the crypto isakmp key command:

Router1(config)#crypto isakmp key TUNNELKEY01 address 172.16.2.1 no-xauth

As you can see, this sets this key only for one IP address, which is the address of the other router. We have included the no-xauth option on the command line to explicitly disable IKE Extended Authentication (XAuth) on the routers, which is not necessary when the peer is another router. ISAKMP can work with either IP addresses or host names to identify devices. So we could have specified this command like this instead:

Router1(config)#crypto isakmp key TUNNELKEY01 hostname Router2.oreilly.com no-xauth

However, to do this, we would also have needed to ensure that the remote device used its hostname when declaring its ISAKMP identity:

Router2(config)#crypto isakmp identity hostname

We avoided this extra complication by simply using IP addresses, which is the default behavior. But you might want to consider using hostnames instead of IP addresses if the network topology means that there could be some ambiguity in which IP address will be used.

There are several useful commands for looking at the ISAKMP functions on your router. The first is show crypto isakmp key, which lists all of the available preshared keys:

Router1#show crypto isakmp key

Keyring               Hostname/Address                   Preshared Key

default               172.16.2.1                         TUNNELKEY01

outer1#

Note that this doesn't mean that there is an active SA using this key, merely that the key is available if required. If you want to see information on active ISAKMP SAs, you should use the following command:

Router1#show crypto isakmp sa

dst             src             state          conn-id slot status

172.16.2.1      172.16.1.1      QM_IDLE              1    0 ACTIVE

Router1#

In this case, you can see that there is an active connection between the two routers shown in the example. The connection ID for this particular SA is shown in the conn-id column. You can use this ID number to clear the SA and force the routers to renegotiate as follows:

Router1#clear crypto isakmp 1

Router1#show crypto isakmp sa

dst             src             state          conn-id slot status

172.16.2.1      172.16.1.1      MM_NO_STATE          1    0 ACTIVE (deleted)

Router1#

This particular ISAKMP SA is now in a deleted state, as the routers begin to renegotiate their ISAKMP parameters. A short time later, they will re-establish a new SA. Note, however, that this is just the ISAKMP SA, which is only needed at call setup time. So the actual IPSec security association is actually still active:

Router1#show crypto ipsec sa

interface: FastEthernet0/0

    Crypto map tag: TUNNELMAP, local addr 172.16.1.1

   protected vrf: (none)

   local  ident (addr/mask/prot/port): (172.16.1.1/255.255.255.255/47/0)

   remote ident (addr/mask/prot/port): (172.16.2.1/255.255.255.255/47/0)

   current_peer 172.16.2.1 port 500

     PERMIT, flags={origin_is_acl,}

    #pkts encaps: 14, #pkts encrypt: 14, #pkts digest: 14

    #pkts decaps: 14, #pkts decrypt: 14, #pkts verify: 14

    #pkts compressed: 0, #pkts decompressed: 0

    #pkts not compressed: 0, #pkts compr. failed: 0

    #pkts not decompressed: 0, #pkts decompress failed: 0

    #send errors 1, #recv errors 0

     local crypto endpt.: 172.16.1.1, remote crypto endpt.: 172.16.2.1

     path mtu 1500, ip mtu 1500

     current outbound spi: 0xDBE0A93(230558355)

     inbound esp sas:

      spi: 0x33CEA934(869181748)

        transform: esp-256-aes ,

Router1#ping 192.168.1.2

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 192.168.1.2, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 8/8/8 ms

Router1#

We can knock down the IPSec session with this command:

Router1#clear crypto session

The next part of the router configuration defines the IPSec transform set, and gives it the name TUNNEL-TRANSFORM to distinguish it from other transform sets that we might want to use for other purposes:

Router1(config)#crypto ipsec transform-set TUNNEL-TRANSFORM ah-sha-hmac esp-aes 256

Router1(cfg-crypto-trans)#mode transport

A transform is simply the operation that IPSec will perform on any matching data packets. There are several possible transforms, which are discussed in Table 12-2.

In the above example, we chose to combine the more secure 256-bit AES encryption with the more reliable SHA authentication system for maximum security on both the AH and ESP portions of the packet. As we said earlier, many of the combinations are not possible (for example, you cannot combine 56-bit DES with 168-bit DES, as it doesn't make sense). The router prevents you from entering impossible combinations.

It's also worth mentioning that, as Table 12-2 mentions, you can use IPSec to do compression of the IP packet payload. This is not commonly done, though, because there are problems with combining encryption with compression.

We note in passing that while the authors of the IPSec RFCs argue eloquently for the separate usefulness of authentication and encryption, in practice we believe that most of the time if your traffic is sensitive enough for one, you should do both. There are rare exceptions. It may be worthwhile authenticating NTP traffic, for example, to ensure that your time sources are valid, while the actual time of day information in the packet payload is not a sensitive piece of information. However, the extra configuration required to do both at the same time on the router is minimal, and if your router's CPU can't easily handle the load of both encrypting and authenticating, it is probably not the right router for the job. So if you are going to either authenticate or encrypt your traffic, we recommend using both together for added security.

In this transform set, we have also instructed the router to use IPSec Transport mode:

Router1(cfg-crypto-trans)#mode transport

By default, IPSec connections will use Tunnel mode, which means that the two devices will set up their own tunnel for IPSec to use. This actually uses the IP-in-IP tunnel protocol that we mentioned in the introduction to this chapter. However, in this example we want to use a GRE tunnel between the routers instead, and simply authenticate and encrypt the GRE packets. This requires Transport mode.

The main reasons for using GRE tunnels instead of IPSec's native tunnel mode are simplicity and flexibility. Using a GRE tunnel between these routers allows us to take advantage of some of the useful GRE features, if we want them.. And the GRE tunnel makes debugging much easier as we can simply disable the encryption and ping through the tunnel, or ping the tunnel destination addresses to verify connectivity without the complications of authentication and encryption. If the other end of this tunnel was a workstation instead of a router , we would have to use Tunnel mode.

The next step is to define a crypto map that combines all of these elements. The following set of commands defines a map called TUNNELMAP. The number following this name is a sequence number, similar to the route map sequence numbers .This allows you to associate many peers with a single router interface, by creating several different map clauses with different sequence numbers, all associated with the same map.

The keyword ipsec-isakmp on the end of the crypto map command tells the router that this map will apply to IPSec connections that use ISAKMP for key management. You could also specify ipsec-manual if you wanted to do the key management manually. But in general, we don't recommend manual key management because it is so much trouble to get right, while ISAKMP automates most of the work for you:

Router1(config)#crypto map TUNNELMAP 10 ipsec-isakmp

% NOTE: This new crypto map will remain disabled until a peer

    and a valid access list have been configured.

Router1(config-crypto-map)#set peer 172.16.2.1

Router1(config-crypto-map)#set transform-set TUNNEL-TRANSFORM

Router1(config-crypto-map)#match address 102

Router1(config-crypto-map)#exit

Router1(config)#access-list 102 permit gre host 172.16.1.1 host 172.16.2.1

The crypto map defines an IPSec peer device by its IP address. If you are using hostnames instead of IP addresses, as we discussed earlier in this recipe, you should specify the peer's hostname instead of an IP address here. The map also selects the appropriate transform set, and matches on a particular set of IP addresses, defined in this case by access-list 102.

The access list tells IPSec what packets it should apply this transform set to. In this case, we specify a source IP address of 172.16.1.1, which is the IP address of the tunnel source, and 172.16.2.1, which is the tunnel's destination address. And because of the gre keyword, this access list will only match on GRE tunnel packets with these source and destination addresses.

Note that on the other router, the peer address is 172.16.1.1, and the access-list reverses the source and destination addresses:

Router2(config)#access-list 102 permit gre host 172.16.2.1 host 172.16.1.1

Then, with all of the IPSec and ISAKMP configuration in place, we can finally create the tunnel and turn on the encryption.

Router1(config)#interface Tunnel1

Router1(config-if)#ip address 192.168.1.1 255.255.255.252

Router1(config-if)#tunnel source 172.16.1.1

Router1(config-if)#tunnel destination 172.16.2.1

Router1(config-if)#exit

Router1(config)#interface FastEthernet0/0

Router1(config-if)#ip address 172.16.1.1 255.255.255.0

Router1(config-if)#ip access-group 101 in

Router1(config-if)#crypto map TUNNELMAP

Router1(config-if)#exit

Router1(config)#access-list 101 permit gre host 172.16.2.1 host 172.16.1.1

Router1(config)#access-list 101 permit esp host 172.16.2.1 host 172.16.1.1

Router1(config)#access-list 101 permit udp host 172.16.2.1 host 172.16.1.1 eq isakmp

Router1(config)#access-list 101 permit ahp host 172.16.2.1 host 172.16.1.1

Router1(config)#access-list 101 deny ip any any log

It's extremely important to notice that we have applied the crypto map to the interface that will be receiving the GRE packets, and not to the tunnel itself. This is because IPSec is encrypting the GRE tunnel packets rather than the payload of those packets. For one thing, the GRE tunnel's payload is not necessarily an IP packet. However, even when they are IP packets, the source and destination IP addresses of the GRE payload could be devices somewhere behind the router. This breaks the essential requirement for IPSec's Transport mode, which is that the source and destination IP addresses must be the devices themselves. So the only way you could successfully apply the crypto map to the tunnel interface would be by using an IPSec tunnel inside of the GRE tunnel, which would not be very efficient.

Also notice the access-list that we have applied to the external interface in this example.

We have done this to more accurately simulate the configuration for running encrypted site-to-site VPNs through the public Internet. In such situations you will need to have some sort of inbound traffic restrictions on your router to block unwanted traffic. This access-list shows the types of packets that you should allow your router to accept from the Internet to support the VPN. You will probably have other rules in practice as well.

The first line of access-list 101 permits the GRE packets themselves. Recall that we will be encrypting the GRE packets, so you are unlikely to see GRE packets in the steady state. However, we like to include a rule like this because it makes troubleshooting easier. As we mentioned above, you can simply remove the crypto map command from the external interfaces and verify connectivity between the tunnel interfaces:

Router1(config)#access-list 101 permit gre host 172.16.2.1 host 172.16.1.1

The second line permits the Encapsulation Security Protocol (ESP), which contains the encrypted packet payloads:

Router1(config)#access-list 101 permit esp host 172.16.2.1 host 172.16.1.1

The next line allows UDP Port 500, which is used by the ISAKMP protocol for establishing the IPSec connection:

Router1(config)#access-list 101 permit udp host 172.16.2.1 host 172.16.1.1 eq isakmp

We also allow Authentication Header Protocol (AHP):

Router1(config)#access-list 101 permit ahp host 172.16.2.1 host 172.16.1.1

You can see that the encryption is working properly by looking at the output of the following command on either router:

Router2#show crypto engine connections active

  ID Interface         IP-Address   State  Algorithm           Encrypt  Decrypt

   3 FastEthernet0/0   172.16.2.1   set    HMAC_SHA+AES_256_C        0    0

2000 FastEthernet0/0   172.16.2.1   set    HMAC_SHA                  0  522

2001 FastEthernet0/0   172.16.2.1   set    HMAC_SHA                859    0

2002 FastEthernet0/0   172.16.2.1   set    AES_256_CBC               0  522

2003 FastEthernet0/0   172.16.2.1   set    AES_256_CBC             859    0

Router2#

This shows that the router has received and decrypted 522 encrypted packets from the peer we defined, and it has sent 859. It also shows we are using the SHA hash algorithm for authentication and 256-byte AES for encryption in the Algorithm column.

CCIE examination entails two assessments, that are a CCIE created look at and a CCIE lab test. In order to endeavor the lab exam, it is advisable to distinct the composed examination. For everybody who is not in the position to crystal clear the created examination the 1st time, you'll want to check out for any hundred and eighty days for retaking it. When clearing the published look at, it is recommended to make an try for that CCIE lab exam in eighteen months. It you're unable to distinct the lab examination, then you will want to re-try within 12 months by having a view to take care of the written examination consequence valid.

It's a time prohibit of two hrs and is also carried out in numerous have a look at centers the world over. The subjects lined throughout the penned exam rely on the specialization or track you decide on. For company supplier, chances are you'll choose from categories like Cable, DSL, IP Telephony, Dial, Articles and other content materials Networking, Optical, WAN switching, and Metro Ethernet. Every prepared test is built in existence within the beta variety at a price of $50 USD.

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A sound passing score is critical to attempt a CCIE Labs examination. Cisco uses the help of proctors to guage the candidates inside preliminary rounds in its CCIE labs located worldwide. Factors are awarded when a criterion is met and grading is carried out implementing some computerized tools. The outcomes of a lab examination are mirrored inside of forty eight hours. A move/fail is projected inside the end end result and in case of a fail, the areas where you're lacking behind are talked about so as to put together properly earlier than a re-try.

Cisco stands out in the discipline of networking by providing a CCIE certification so that you can pursue your education as well as get acknowledged by a reputed organization. The CCIE lab examination can be utilized as being a platform to challenge your capability in varied tracks provided by Cisco. Attempting a lab examination requires rigorous schooling and substantial sense of understanding. The CCIE labs sort step one to your huge potential career.

Router#configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)#interface HSSI0/0

Router(config-if)#encapsulation frame-relay

Router(config-if)#exit

Router(config)#interface HSSI0/0.1 point-to-point

Router(config-subif)#traffic-shape rate 150000

Router(config-subif)#frame-relay interface-dlci 31

Router(config-subif)#exit

Router(config)#end

Router#

Most Frame Relay carrier networks are sufficiently over-provisioned that you can actually use much more capacity than your contractual Committed Information Rate (CIR). So you might want to apply traffic shaping only when you encounter Frame-Relay congestion problems, and then only to reduce the data rate until the congestion goes away:

Router#configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)#interface HSSI0/0

Router(config-if)#encapsulation frame-relay

Router(config-if)#exit

Router(config)#interface HSSI0/0.1 point-to-point

Router(config-subif)#traffic-shape adaptive 10000

Router(config-subif)#frame-relay interface-dlci 31

Router(config-subif)#exit

Router(config)#end

Router#

In this recipe, we don't want to control the entire aggregate traffic flow, and we don't care about the traffic based on application. Here we want to ensure that every Frame Relay PVC using this interface is shaped separately so that they don't overrun the amount of bandwidth purchased from the WAN carrier. If you have 20 PVCs on an interface, it is fine to send the maximum per-PVC bandwidth to all of them simultaneously, but you will suffer from terrible performance problems if you try to send all of that bandwidth through a single PVC.

Usually you will purchase a particular amount of Frame Relay bandwidth, or CIR, from the WAN carrier for each PVC. So the first example shows how you can force the router to only send 150 Kbps through the PVC with DLCI 31. It is important to remember that you can have different CIR values for some PVC's than others. So you may need to have a different Frame-Relay traffic-shaping rate on every PVC.

The second example assumes that a lot of the time there will actually be very little congestion in the carrier's network, so you should be able to safely use some of the excess capacity. The Frame Relay protocol includes the ability to tell devices when there is congestion in the network. There are two types of congestion notifications, which are just noted as flags in the header portion of regular user frames. If a router receives a frame with the Forward Explicit Congestion Notification (FECN) flag set, it knows that the frame encountered congestion on its way from the remote device to the router. If the router receives a frame with the Backward Explicit Congestion Notification (BECN) flag set, this means that a frame encountered congestion on its way from this router to the remote device.

The traffic-shape adaptive command tells the router that when it sees frames with a BECN flag, it should reduce the sending rate on this PVC. By default, this command will back off the sending rate all the way to zero. So in the example, we have specified a minimum rate of 10,000 bps, which would correspond to the CIR for this PVC:

Router(config-subif)#traffic-shape adaptive 10000

In general, this adaptive traffic shaping method is preferred over the static method because it will give you significantly better network performance when the carrier's network is not congested. However, it is important to remember that the precise implementation of FECN and BECN markings is up to the carrier. Some carriers disable these features altogether, while others use them inconsistently. Since most customers ignore these markings, there is often very little reason to ensure that they are accurate.

You should check with your network vendor before implementing adaptive frame-relay traffic shaping. And, in fact, we recommend monitoring your FECN and BECN statistics for a reasonable period of time before implementing, to verify that they are reliable.

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For your CCIE Protection certification, it's essential to register for that prepared examination as part of your area of specialization. The many exams are performed in the Cisco licensed facility, which also accepts price tag for the exam. The price of taking a CCIE penned examination is from $80 to $325. The created examination is supervised and carried out on a computer system. It is of 1 or two hrs paper containing quite a few alternatives, drag and drop thoughts and fill within the blanks. Apart from white boards and markers for calculations, as being a candidate for CCIE Safety coaching examination, you aren't permitted to carry almost every other merchandise for the examination hall.

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Router#configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)#interface HSSI0/0

Router(config-if)#encapsulation frame-relay

Router(config-if)#exit

Router(config)#interface HSSI0/0.1 point-to-point

Router(config-subif)#traffic-shape rate 150000

Router(config-subif)#frame-relay interface-dlci 31

Router(config-subif)#exit

Router(config)#end

Router#

Most Frame Relay carrier networks are sufficiently over-provisioned that you can actually use much more capacity than your contractual Committed Information Rate (CIR). So you might want to apply traffic shaping only when you encounter Frame-Relay congestion problems, and then only to reduce the data rate until the congestion goes away:

Router#configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)#interface HSSI0/0

Router(config-if)#encapsulation frame-relay

Router(config-if)#exit

Router(config)#interface HSSI0/0.1 point-to-point

Router(config-subif)#traffic-shape adaptive 10000

Router(config-subif)#frame-relay interface-dlci 31

Router(config-subif)#exit

Router(config)#end

Router#

In this recipe, we don't want to control the entire aggregate traffic flow, and we don't care about the traffic based on application. Here we want to ensure that every Frame Relay PVC using this interface is shaped separately so that they don't overrun the amount of bandwidth purchased from the WAN carrier. If you have 20 PVCs on an interface, it is fine to send the maximum per-PVC bandwidth to all of them simultaneously, but you will suffer from terrible performance problems if you try to send all of that bandwidth through a single PVC.

Usually you will purchase a particular amount of Frame Relay bandwidth, or CIR, from the WAN carrier for each PVC. So the first example shows how you can force the router to only send 150 Kbps through the PVC with DLCI 31. It is important to remember that you can have different CIR values for some PVC's than others. So you may need to have a different Frame-Relay traffic-shaping rate on every PVC.

The second example assumes that a lot of the time there will actually be very little congestion in the carrier's network, so you should be able to safely use some of the excess capacity. The Frame Relay protocol includes the ability to tell devices when there is congestion in the network. There are two types of congestion notifications, which are just noted as flags in the header portion of regular user frames. If a router receives a frame with the Forward Explicit Congestion Notification (FECN) flag set, it knows that the frame encountered congestion on its way from the remote device to the router. If the router receives a frame with the Backward Explicit Congestion Notification (BECN) flag set, this means that a frame encountered congestion on its way from this router to the remote device.

The traffic-shape adaptive command tells the router that when it sees frames with a BECN flag, it should reduce the sending rate on this PVC. By default, this command will back off the sending rate all the way to zero. So in the example, we have specified a minimum rate of 10,000 bps, which would correspond to the CIR for this PVC:

Router(config-subif)#traffic-shape adaptive 10000

In general, this adaptive traffic shaping method is preferred over the static method because it will give you significantly better network performance when the carrier's network is not congested. However, it is important to remember that the precise implementation of FECN and BECN markings is up to the carrier. Some carriers disable these features altogether, while others use them inconsistently. Since most customers ignore these markings, there is often very little reason to ensure that they are accurate.

You should check with your network vendor before implementing adaptive frame-relay traffic shaping. And, in fact, we recommend monitoring your FECN and BECN statistics for a reasonable period of time before implementing, to verify that they are reliable.

The CCIESecurityTrainingcoaching consists of a created examination to qualify after which the lab test. You might be advised to obtain for the least 3-5 many years of occupation knowledge earlier than wanting this certification.

The examination for your CCIE Safety is of two-hour size with multiple decisions. This is made of hundred problems, that will cover topics equivalent to software package protocols, performing devices, safety technologies, basic safety protocols, and Cisco security purposes. The examination materials are supplied to the spot and you also are not allowed to usher in external reference materials.

Network engineers having a CCIE certificates are thought-about because the pro during the community engineering discipline as well as the masters of CISCO goods. The CCIE has introduced revolution inside of the community field in terms of technically complicated assignments and options considering the mandatory instruments and methodologies. There is certainly a application which updates and reorganizes the instruments to produce superior quality service. There are assorted modes of CCIE Exercise like published examination preparing and effectivity based lab. This aids to reinforce the performance and natural within the trade. CISCO has launched this certification policy in 1993 having a look at to distinguish the highest analysts with the rest.

To be able to be licensed, first of all penned examination have got to be handed once which needs to cross the lab test. CISCO in the slightest degree instances tries to apply absolutely distinct CCIE Education processes for larger performance. There are a number of techniques for the CCIE certification. The primary stage for certification should be to pass a two hours lasting computer primarily based typically MCQ oriented penned exam. For this exam crucial payments must be completed by the use of web based. This examination is associated with exam vouchers and promotional codes. The authenticity on the voucher delivering firm must be effectively identified on the candidates. The promotional code really should be accessed effectively and in case of fraudulent vouchers as well as promotional codes mustn't suitable and CISCO will not repay the value. The candidates have to wait 5 days for your published examination when payment and they cannot sit for that exact exam for the following one hundred eighty days just in case of recertification.

Along with a view to obtain licensed and qualified for that CCIE Instruction some parts are to get remembered accurately. Following passing the written examination the candidates have a very nearly all of eighteen months time for hoping the lab test. In the event the time period exceeds then the authenticity for the created test could be invalid. For that initially timer used to possess CCIE certification the published examination is available within the form of Beta examination with savings out there. Inside the Beta interval the candidates can sit only once for the exam. The outcomes will arrive inside of 6 to eight weeks soon after the examination is around.

Another step for that CCIE certification would be the Lab examination. The shortlisted candidates in the penned examination can entirely implement for your fingers-on lab examination. While there are plenty of composed examination centers of CISCO but nevertheless Lab examination facilities are minimal. It truly is an eight hour fingers-on practical based typically examination whereby the power of troubleshooting and configuring group principally dependent problems and software system are checked. For your scheduling of Lab examination the shortlisted candidates in the previously published exam will have to present the identification quantity alongside passing ranking as well as the date of passing.

The price for Lab examination must be cleared before than ninety days in the scheduled examination. With out the fee the reservation may possibly be cancelled. Immediately after passing the Lab test mixed considering the developed test the candidates can implement for that CCIE certification. By considering

There will have to be some thing that defines the various types of site visitors that you need to prioritize. Normally, the more simple the distinctions are to generate, the better. It's because all of the checks just take router assets and introduce processing delays. The most common guidelines for distinguishing in between visitors sorts utilize the packet's input interface and easy to understand IP header info these kinds of as TCP port figures. The next examples present a way to set an IP Precedence worth of fast (2) for all FTP command visitors that arrives because of the serial0/0 interface, and an IP Precedence of priority (1) for all FTP knowledge visitors. This distinction is feasible as a result of FTP control targeted traffic utilizes TCP port 21, and FTP data works by using port 20.

The new way for configuring this utilizes course maps. Cisco initial released this function in IOS Edition twelve.0(five)T. This process initial defines a class-map that specifies how the router will identify this sort of customers. It then defines a policy-map that really helps make the improvements towards the packet's TOS area:

Router#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#access-list 101 permit any eq ftp any
Router(config)#access-list 101 permit any any eq ftp
Router(config)#access-list 102 permit any eq ftp-data any
Router(config)#access-list 102 permit any any eq ftp-data
Router(config)#class-map match-all ser00-ftpcontrol
Router(config-cmap)#description branch ftp control traffic
Router(config-cmap)#match input-interface serial0/0
Router(config-cmap)#match access-group 101
Router(config-cmap)#exit
Router(config)#class-map match-all ser00-ftpdata
Router(config-cmap)#description branch ftp data traffic
Router(config-cmap)#match input-interface serial0/0
Router(config-cmap)#match access-group 102
Router(config-cmap)#exit
Router(config)#policy-map serialftppolicy
Router(config-pmap)#description branch ftp traffic policy
Router(config-pmap)#class ser00-ftpcontrol
Router(config-pmap-c)#set ip precedence immediate
Router(config-pmap-c)#exit
Router(config-pmap)#class ser00-ftpdata
Router(config-pmap-c)#set ip precedence priority
Router(config-pmap-c)#exit
Router(config-pmap)#exit
Router(config)#interface serial0/0
Router(config-if)#ip route-cache policy
Router(config-if)#service-policy input serialftppolicy
Router(config-if)#exit
Router(config)#end
Router#

For earlier IOS variations, where exactly class-maps ended up not attainable, you've to make use of policy-based routing to change the TOS area within a packet. Making use of this coverage for the interface tells the router make use of this policy to check all incoming packets on this interface and rewrite those that match the route map:Router#configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#access-list 101 permit any eq ftp any
Router(config)#access-list 101 permit any any eq ftp
Router(config)#access-list 102 permit any eq ftp-data any
Router(config)#access-list 102 permit any any eq ftp-data
Router(config)#route-map serialftp-rtmap permit 10
Router(config-route-map)#match ip address 101
Router(config-route-map)#set ip precedence immediate
Router(config-route-map)#exit
Router(config)#route-map serialftp-rtmap permit 20
Router(config-route-map)#match ip address 102
Router(config-route-map)#set ip precedence priority
Router(config-route-map)#exit
Router(config)#interface serial0/0
Router(config-if)#ip policy route-map serialftp-rtmap
Router(config-if)#ip route-cache policy
Router(config-if)#exit
Router(config)#end
Router#

Previously you?ˉre able to tag a packet for extraordinary therapy, you've gotten to acquire an incredibly obvious thought of what kinds of site visitors really need exceptional treatment, along with exactly what sort of extraordinary therapy they are going to have. In the instance, we've made a decision to give a extraordinary priority to FTP site visitors obtained on the particular serial interface. We indicate find out how to do this making use of the two the previous and new configuration techniques.
This will look to become a relatively artificial illustration. Following all, why would you care about tagging inbound page views that you simply have already acquired from a low-speed interface? Actually, one of the most critical concepts for applying QoS in a very network is the fact that you must typically tag the packet as early as feasible, ideally at the edges with the network. Then, because it passes with the network, every single router only has to look at the tag, and isn't going to need to do any supplemental classification. In cases like this, we'd be certain which the FTP website traffic returning in the other direction is tagged through the initially router that gets it. Therefore the outbound customers has currently been tagged, and it is a waste of router assets to reclassify the outbound packets.

A number of organizations ultimately get this concept of marking in the edges just one stage more, and remark just about every acquired packet. This assists to ensure that consumers aren't requesting particular QoS privileges they are not allowed to have. But, you need to be watchful of this seeing that it could oftentimes disrupt authentic markings. To illustrate, a real-time application might probably use RSVP to reserve bandwidth from the network. It truly is really important the packets for this software hold the acceptable Expedited Forwarding (EF) DSCP marking or even the network won't manage them correctly. But nevertheless, you also do not choose to permit other non-real-time applications from this same source hold the similar EF concern amount. So, when you are heading to configure your routers to remark all incoming packets at the edges, always make sure you fully understand what incoming markings are genuine.

In that scenario, the routers are working DLSw to bridge SNA traffic by an IP network. So the routers themselves ultimately formulate the IP packets. This creates a further challenge as you can find no incoming interface. To ensure that recipe works by using nearby policy-based routing. The fact the router makes the packets also gives it a very important gain due to the fact it does not have to look at any DLSw packets which may just come about to pass through.

The advantages of your newer class-map approach aren't apparent in this particular instance, but one of several earliest massive merits seems if you need to work with the more modern-day DSCP tagging scheme. As the mature policy-based routing methodology does not right assistance DSCP, you will have to fake it by setting both the IP Precedence additionally, the TOS independently as follows.

Router(config)#route-map serialftp-rtmap permit 10
Router(config-route-map)#match ip address 115
Router(config-route-map)#set ip precedence immediate
Router(config-route-map)#set ip tos max-throughput

In this case, the packet will wind up with an IP Precedence value of immediate, or 2 (010 in binary), and TOS of max-throughput, or 4 (0100 in binary).

Doing the same thing with the class-map method is much more direct:

Router(config)#policy-map serialftppolicy
Router(config-pmap)#class serialftpclass
Router(config-pmap-c)#set ip dscp af21

Class-maps will also be practical later on in such a chapter when we mention class-based weighted truthful queuing and class-based potential customers shaping.
It is important to notice that all over this entire case in point, we've only set a particular price into your packet's TOS or DSCP discipline. This, by by itself, doesn't influence how the packet is forwarded by the network. To undertake that, it's essential to make certain that as each and every router with the network forwards these marked packets, the interface queues will react appropriately to this info.

At long last, we must always notice that when this recipe reveals two practical ways of marking packets, using Committed Entry Charge (Autobus) attributes. Vehicle tends to become a lot of efficient on increased velocity interfaces.

Central#configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Central(config)#interface Serial0

Central(config-if)#encapsulation frame-relay

Central(config-if)#frame-relay ip tcp header-compression passive

Central(config-if)#exit

Central(config)#end

Central#

This command also works at the subinterface level:

Central#configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Central(config)#interface Serial0.1 point-to-point

Central(config-subif)#frame-relay ip tcp header-compression passive

Central(config-subif)#exit

Central(config)#end

Central#

There are also two different payload compression options. The first uses the FRF.9 Frame Relay compression standard:

Central#configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Central(config)#interface Serial0.1 point-to-point

Central(config-if)#frame-relay payload-compression frf9 stac

Central(config-if)#exit

Central(config)#end

Central#

And the second uses Cisco's proprietary packet-by-packet compression:

Central#configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Central(config)#interface Serial0.1 point-to-point

Central(config-if)#frame-relay payload-compression packet-by-packet

Central(config-if)#exit

Central(config)#end

Central#

The nice thing about the first example in this recipe is that with the passive keyword, the router sends packets with compressed TCP headers only if it receives packets with compressed headers. So if you have a variety of remote sites, some of which have routers that don't support header compression, this can be a useful configuration option. You need to configure the device on at least one end without the passive keyword:

Branch1#configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Branch1(config)#interface Serial0

Branch1(config-if)#encapsulation frame-relay

Branch1(config-if)#frame-relay ip tcp header-compression

Branch1(config-if)#exit

Branch1(config)#end

Branch1#

Note that Cisco recommends shutting down the interface before changing this feature. It is not dangerous, but with some routers you need to reset the interface to ensure that it picks up the new configuration. The cleanest way to do this is to shut it down before making the change, and then bring it back up when you are done.

For the payload compression examples, it is critical to configure the same compression on both ends. This is a subinterface level command, so you can configure each PVC to use compression or not, according to what the device on the other end supports.

In both cases, by default the router will do the compression in a Compression Service Adapter (CSA), if one exists. If the router doesn't have a CSA, then it will use a Versatile Interface Processor (VIP-2) card instead. And, if it doesn't have either of these hardware options, then it will do the compression in software using the router's CPU. Some external Frame Relay Access Devices (FRAD) also include FRF.9 compression, but it is unlikely that you will find a FRAD the supports Cisco's packet-by-packet compression.

The FRF.9 compression command can also take several different options that allow you to force different hardware options. For example, you can force the router to use a particular CSA as follows:

Central(config-if)#frame-relay payload-compression frf9 stac csa 1

Or, if you want to force the router to do the compression in its CPU, you can use the software keyword:

Central(config-if)#frame-relay payload-compression frf9 stac software

The stac keyword in all of these FRF.9 examples specifies the standard Stacker algorithm. In fact, this is the only option available for FRF.9 compression.

In general, we recommend using FRF.9 rather than packet-by-packet compression because it is an open standard, while packet-by-packet will only work with Cisco equipment. There is no noticeable performance difference between the two compression types. Cisco introduced its own packet-by-packet compression method before the FRF.9 standard was available, and continues to support it primarily for backward compatibility.

You can see statistics on the header compression with the following command:

Router#show frame-relay ip tcp header-compression

  DLCI 100       Link/Destination info:  point-to-point dlci

  Interface Serial1:

    Rcvd:    220 total, 219 compressed, 0 errors

             0 dropped, 0 buffer copies, 0 buffer failures

    Sent:    482 total, 481 compressed,

             17001 bytes saved, 229749 bytes sent

             1.7 efficiency improvement factor

    Connect: 16 rx slots, 16 tx slots, 1 long searches, 1 misses

             99% hit ratio, five minute miss rate 0 misses/sec, 0 max

Router#