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Q61. Refer to the exhibit. 

Router A and router B are physically connected over an Ethernet interface, and IS-IS is configured as shown. Which option explains why the IS-IS neighborship is not getting formed between router A and router B? 

A. same area ID 

B. same N selector 

C. same domain ID 

D. same system ID 

Answer: D 

Explanation: 

With IS-IS, the LSP identifier is derived from the system ID (along with the pseudonode ID and LSP number). Each IS is usually configured with one NET and in one area; each system ID within an area must be unique. The big difference between NSAP style addressing and IP style addressing is that, in general, there will be a single NSAP address for the entire router, whereas with IP there will be one IP address per interface. All ISs and ESs in a routing domain must have system IDs of the same length. All routers in an area must have the same area address. All Level 2 routers must have a unique system ID domain-wide, and all Level 1 routers must have a unique system ID area-wide. 

Reference: http://www.cisco.com/en/US/products/ps6599/products_white_paper09186a00800a3e6f.sh tml 


Q62. What is the maximum number of classes that MQC can support in a single policy map? 

A. 512 

B. 256 

C. 128 

D. 64 

Answer: B 


Q63. Refer to the exhibit. 

You have just created a new VRF on PE3. You have enabled debug ip bgp vpnv4 unicast updates on PE1, and you can see the route in the debug, but not in the BGP VPNv4 table. 

Which two statements are true? (Choose two.) 

A. VPNv4 is not configured between PE1 and PE3. 

B. address-family ipv4 vrf is not configured on PE3. 

C. After you configure route-target import 999:999 for a VRF on PE3, the route will be accepted. 

D. PE1 will reject the route due to automatic route filtering. 

E. After you configure route-target import 999:999 for a VRF on PE1, the route will be accepted. 

Answer: D,E 

Explanation: 

The route target extended community for VPLS auto-discovery defines the import and export policies that a VPLS instance uses. The export route target sets an extended community attribute number that is appended to all routes that are exported from the VPLS instance. The import route target value sets a filter that determines the routes that are accepted into the VPLS instance. Any route with a value in its import route target contained in its extended attributes field matching the value in the VPLS instance’s import route target are accepted. Otherwise the route is rejected. 


Q64. Which statement is true regarding UDLD and STP timers? 

A. The UDLD message timer should be two times the STP forward delay to prevent loops. 

B. UDLD and STP are unrelated features, and there is no relation between the timers. 

C. The timers need to be synced by using the spanning-tree udld-sync command. 

D. The timers should be set in such a way that UDLD is detected before the STP forward delay expires. 

Answer: D 

Explanation: 

UDLD is designed to be a helper for STP. Therefore, UDLD should be able to detect an unidirectional link before STP would unblock the port due to missed BPDUs. Thus, when you configure UDLD timers, make sure your values are set so that unidirectional link is detected before “STP MaxAge + 2xForwardDelay” expires. 

Reference: http://blog.ine.com/tag/stp/ 


Q65. DRAG DROP 

Drag and drop the EIGRP term on the left to the corresponding definition on the right. 

Answer: 


Q66. Refer to the exhibit. 

How many LSDBs will router A have? 

A. 0 

B. 1 

C. 2 

D. 3 

Answer: D 


Q67. Which three parameters must match to establish OSPF neighbor adjacency? (Choose three.) 

A. the process ID 

B. the hello interval 

C. the subnet mask 

D. authentication 

E. the router ID 

F. the OSPF interface priority 

Answer: B,C,D 


Q68. Refer to the exhibit. 

For which reason could a BGP-speaking device in autonomous system 65534 be prevented from installing the given route in its BGP table? 

A. The AS number of the BGP is specified in the given AS_PATH. 

B. The origin of the given route is unknown. 

C. BGP is designed only for publicly routed addresses. 

D. The AS_PATH for the specified prefix exceeds the maximum number of ASs allowed. 

E. BGP does not allow the AS number 65535. 

Answer: A 

Explanation: 

BGP is considered to be a 'Path Vector' routing protocol rather than a distance vector routing protocol since it utilises a list of AS numbers to describe the path that a packet should take. This list is called the AS_PATH. Loops are prevented because if a BGP speaking router sees it's own AS in the AS_PATH of a route it rejects the route. 


Q69. Which two statements about OSPF are true? (Choose two.) 

A. External type 2 routes are preferred over interarea routes. 

B. Intra-area routes are preferred over interarea routes. 

C. External type 1 routes are preferred over external type 2 routes. 

D. External type 1 routes are preferred over intra-area routes. 

E. External type 2 routes are preferred over external type 1 routes. 

Answer: B,C 


Q70. A company is multihomed to several Internet providers using EBGP. Which two measures guarantee that the network of the company does not become a transit AS for Internet traffic? (Choose two.) 

A. Prepend three times the AS number of the company to the AS path list. 

B. Add the community NO_EXPORT when sending updates to EBGP neighbors. 

C. Write AS-path access-list which permits one AS long paths only and use it to filter updates sent to EBGP neighbors. 

D. Add the community NO_EXPORT when receiving updates from EBGP neighbors. 

Answer: C,D 

Explanation: 

By default BGP will advertise all prefixes to EBGP (External BGP) neighbors. This means that if you are multi-homed (connected to two or more ISPs) that you might become a transit AS. Let me show you an example: 

R1 is connected to ISP1 and ISP2 and each router is in a different AS (Autonomous System). Since R1 is multi-homed it’s possible that the ISPs will use R1 to reach each other. In order to prevent this we’ll have to ensure that R1 only advertises prefixes from its own autonomous system. As far as I know there are 4 methods how you can prevent becoming a transit AS: 

Filter-list with AS PATH access-list. 

No-Export Community. 

Prefix-list Filtering 

Distribute-list Filtering 

Reference: http://networklessons.com/bgp/bgp-prevent-transit-as/