Cisco CCNP Service Provider 300-510 Questions & Answers

• Question 131:

  Refer to the exhibit.

  

  P1 and PE3 Cisco IOS XR routers are directly connected and have this configuration applied. The BGP session is not coming up. Assume that there is no IP reachability problem and both routers can open tcp port 179 to each other. Which two actions fix the issue? (Choose two.)

  A. Change MD5 to HMAC-SHA1-12

  B. Change MD5 to HMAC-ESP

  C. Change MD5 to SHA-1

  D. Change MD5 to HMAC-MD5

  E. Remove the send and accept lifetime under key 1

  Correct Answer: AD

  Reference: https://www.cisco.com/c/en/us/td/docs/routers/crs/software/crs_r4-0/security/configuration/guide/sc40crsbook_chapter5.html

• Question 132:

  Refer to the exhibit.

  

  Which router does R1 install as an alternate next hop when trying to reach R3 if LFA is enabled?

  A. R5

  B. R3

  C. R4

  D. R2

  Correct Answer: D

• Question 133:

  What is enabled by default on Cisco IOS-XR routers and cannot be disabled?

  A. SSH server

  B. Multicast routing

  C. IPv4 and IPv6 CEF

  D. IPv6 routing

  E. CDP

  F. BFD

  Correct Answer: C

  Before using the BGP policy accounting feature, you must enable BGP on the router (CEF is enabled by default).

• Question 134:

  Refer to the exhibit.

  

  CE1 and CE2 cannot communicate through the service provider BGP peering is established between PE1 and PE2. IS-IS is the only routing protocol running in the service provider core. What step can be done to troubleshoot the issue?

  A. Switch the IGPs running in the core from IS-IS to OSPF to support a Cisco MPLS TE tunnel from PE1 to PE2.

  B. Configure BGP between CE and PE routers.

  C. Confirm that IS-IS is running with metric-style narrow.

  D. Verify the MPLS LSPs.

  Correct Answer: C

• Question 135:

  Refer to the exhibit.

  

  Router 1 has attempted to establish a Cisco MPLS TE tunnel to router 2, but the tunnel has failed. Which statement about this configuration is true?

  A. Router 1 must define an explicit path to router 2

  B. Router 1 and router 2 must define the RSVP bandwidth reserved on the physical interfaces

  C. Router 2 must have a tunnel interface created with router 1 as the destination

  D. Router 1 must have Cisco MPLS TE enabled on interface gigabitethernet0/1

  Correct Answer: D

• Question 136:

  Which two methods represent IPv6 tunneling implementations? (Choose two.)

  A. IPv6 over GRE tunneling

  B. manually configured tunnels

  C. automatic tunnels

  D. 6to4 tunneling

  E. IPv6 over an IPv4 tunnel over MPLS

  Correct Answer: BC

• Question 137:

  What must occur before an (S,G) entry can be populated in the multicast routing table?

  A. The (*,G) entry must have timed out

  B. The (*,G) entry OIL must be null

  C. The router must be directly connected to the multicast source

  D. The parent (*,G) entry must be created first

  Correct Answer: D

• Question 138:

  Refer to the exhibit.

  

  A network operator must inject a Level 1 route from XR2 (10.16.16.0/24) into the ISIS topology.

  Which configuration allows the injection in a way that XR3 and XR1 have a valid and working route for 10.16.16.0/24?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: D

  L1 route injected by XR2 won't be advertised to XR1, since L2 routes are NOT leaked to L1 by default. An [L2-L1] route leak policy should be configured on L1/L2 router (XR3).

• Question 139:

  Refer to the exhibit.

  

  An engineer is troubleshooting an OSPF issue. Router 1 has a neighbor relationship with router 2. Only router 1 classful EIGRP routes can be seen on router 2. In order for all EIGRP routes to be redistributed correctly, which action should be taken?

  A. Router 1 must have the keyword subnets included in the redistribution command for all EIGRP routes to be redistributed.

  B. Router 1 must remove the AS number 1 from the redistribution command for all EIGRP routes to be redistributed.

  C. Router 1 must have the keyword ospf-metric included in the redistribution command for all EIGRP routes to be redistributed.

  D. Router 1 must have the keyword metric-type 1 included in the redistribution command for all EIGRP routes to be redistributed.

  Correct Answer: A

• Question 140:

  Which cost is the default when redistributing routes from BGP to OSPF?

  A. 20

  B. 1

  C. infinite

  D. automatic

  Correct Answer: B

  Reference: http://www.ciscopress.com/articles/article.asp?p=27573