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Braindumps for "70-441" Exam

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Braindumps for "642-661" Exam

Configuring BGP on Cisco Routers Exam

 Question 1.
Why can using the ip tcp path-mtu-discovery command improve BGP convergence?

A. Smaller MSS sizes may reduce BGP convergence times.
B. BGP is enabled to fragment its large update packets.
C. The BGP memory requirements on routers are reduced.
D. Single packet sizes in TCP sessions are limited.
E. BGP is allowed to use a larger TCP window size.

Answer: A

Question 2.
Refer to the outputs shown in the exhibit. What could be preventing the R1 router from receiving any prefixes from the R2 BGP neighbor?
 
A. R2 is using the wrong AS number in its neighbor 192.168.31.2 remote-as statement.
B. The no sync command is missing on R2.
C. R1 is using the wrong AS number in its neighbor 192.168.31.1 remote-as statement.
D. The no sync command is missing on R1.
E. Both R1 and R2 are not using a loopback address to source their BGP packets.
F. There is a TCP session establishment problem between R1 and R2.

Answer: C

Question 3.
Which configuration will enable the R1 router in the AS51003 sub-AS (member-AS) as a route reflector with neighbors 10.1.1.1 and 10.2.2.2 as its route-reflector clients?

A. ! R1 router bgp 51003 bgp confederation identifier 55111 bgp confederation peers 51001 51002 neighbor 10.1.1.1 remote-as 51001 neighbor 10.2.2.2 remote-as 51002 neighbor 10.1.1.1 routereflector- client neighbor 10.2.2.2 route-reflector-client
B. ! R1 router bgp 55111 bgp confederation identifier 51003 neighbor 10.1.1.1 remote-as 51003 neighbor 10.2.2.2 remote-as 51003 neighbor 10.1.1.1 route-reflector-client neighbor 10.2.2.2 route-reflector-client
C. ! R1 router bgp 55111 bgp confederation identifier 51003 neighbor 10.1.1.1 remote-as 55111 neighbor 10.2.2.2 remote-as 55111 neighbor 10.1.1.1 route-reflector-client neighbor 10.2.2.2 route-reflector-client
D. ! R1 router bgp 51003 bgp confederation identifier 55111 bgp confederation peers 51001 51002 neighbor 10.1.1.1 remote-as 51003 neighbor 10.2.2.2 remote-as 51003 neighbor 10.1.1.1 routereflector- client neighbor 10.2.2.2 route-reflector-client

Answer: D

Question 4.
How does the extended community cost feature influence the BGP best path selection?

A. inserts the cost attribute after the MED attribute comparison, forcing best path route selection if all other preferred route selection criteria are equal
B. selects the BGP route with the highest attached extended community cost value
C. alters the BGP AS exit path selection by adding the link cost to the local preference
D. acts as a best path "tie breaker" when multiple IGP equal cost paths occur
E. reflects the bandwidth of links entering the local AS fromeBGP neighbors (in the MED attribute)

Answer: D

Question 5.
Lab
 
Explanation:
P1R3> enable
P1R3# config terminal
P1R3( config )# router bgp 65001
P1R3( config -router)# no synchronization
P1R3( config -router)# neightbor 10.200.200.12 weight 100
P1R3( config -router)# end
P1R3# clear ip bgp * soft in
P1R3# show ip bgp
P1R3# copy run start

Question 6.
Refer to the partial topology diagram shown.Service Provider 1 (SP1) assigned the customer an AS number of 65275. Service Provider 2 (SP2) assigned an AS number of 65745 to the customer. The customer decides to use AS 65275 internally.Which of the following is the correct partial router configuration to cause updates from CR1 to SP1 to report a source AS of 65275, while updates from CR2 to SP2 report the source AS of 65745 in addition to AS 65275?
 
A. !CR1router bgp 65275neighbor 1.1.1.1 remote-as 65274neighbor 10.1.1.2 remote-as 65275!CR2router bgp 65745neighbor 2.2.2.2 remote-as 65732neighbor 2.2.2.2 local-as 65275neighbor 10.1.1.1 remote-as 65275
B. !CR1router bgp 65275neighbor 1.1.1.1 remote-as 65274neighbor 10.1.1.2 remote-as 65275!CR2router bgp 65275neighbor 2.2.2.2 remote-as 65732neighbor 2.2.2.2 local-as 65745neighbor 10.1.1.1 remote-as 65275
C. !CR1router bgp 65275neighbor 1.1.1.1 remote-as 65274neighbor 1.1.1.1 local-as 
    65745neighbor 10.1.1.2 remote-as 65275!CR2router bgp 65275neighbor 2.2.2.2 remote-as 65732neighbor 2.2.2.2 local-as 65745neighbor 10.1.1.1 remote-as 65275
D. !CR1router bgp 65275neighbor 1.1.1.1 remote-as 65274neighbor 10.1.1.2 remote-as 65275!CR2router bgp 65745neighbor 2.2.2.2 remote-as 65732neighbor 2.2.2.2 local-as 65745neighbor 10.1.1.1 remote-as 65275

Answer: B

Question 7.
Which two statements about a transit AS are correct? (Choose two.)

A. A transit AS uses an IGP like OSPF or ISIS to propagate the external networks within the 
   Transit AS.
B. Routes betweenASs are always exchanged via eBGP.
C. iBGP sessions can be established between non directly connected routers.
D. A transit AS haseBGP connection(s) to only one external AS.
E. Core routers within a transit AS normally use default routing to reach the external networks.

Answer: B, C

Question 8.
Which one of these statements regarding intraconfederation EBGP sessions is correct?

A. Member-AS numbers are removed when a router sends a BGP update over  
    anintraconfederation EBGP session.
B. Anintraconfederation EBGP session behaves like an IBGP session when propagating routing updates.
C. Updates from anintraconfederation EBGP neighbor are subject to the BGP split horizon rule.
D. Intraconfederation EBGP sessions must be established over loopback interfaces.
E. Intraconfederation EBGP neighbors must be directly connected.

Answer: B

Question 9.
When verifying the BGP neighbor relationships on your router, you issue the show ip bgp summary command and there were no results. 

Which of the following could be the problem?

A. The neighbor link is down.
B. All BGP updates from the BGP neighbor were filtered out.
C. The TCP session to the BGP neighbor can't be established.
D. There are no BGP neighbors configured.

Answer: D

Question 10.
Refer to the diagram. 

What should be changed within AS 50001 to improve the route reflector design?
 

A. Remove the IBGP session between the two redundant RRs (R1 and R2).
B. Add an IBGP session between each pair of clients (between R3 and R4, R4 and R5).
C. Make R4 the RR and R1 and R2 its clients. R3 and R5 should be a non-RR/non-client.
D. Add a physical link between R1 and R2.
E. Add a physical link between the clients (R3 and R4, and between R4 and R5).

Answer: D


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