Cisco CCNP Service Provider 300-510 Questions & Answers

• Question 171:

  A network consultant is troubleshooting IS-IS instances to identify why a routing domains is having communication problems between the two instances. Which description of the possible cause of issues in the routing domain is true?

  A. The same interface cannot be advertised in two different IS-IS instances

  B. The IS-IS "ISP" and "ISP2" instances are unrelated and unable to intercommunicate

  C. The configured IS-IS NSEL value is not allowing the routing systems to establish a neighborship

  D. The interface mode ip router is-is command was not included in the script

  Correct Answer: A

  Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_isis/configuration/xe-3s/irs-xe-3s-book/irs-instance-vrf.html

• Question 172:

  Refer to the exhibit.

  

  After troubleshooting an OSPF adjacency issue, routers 1, 2, and 3 have formed OSPF neighbor relationships. Which statement about the configuration is true?

  A. Router 2 receives a Type 5 LSAs from router 1 for its connected subnets

  B. Router 2 uses router 3 as the next hop for 192.168.0.0/24

  C. Router 2 uses router 1 as the next hop for 192.168.0.0/24

  D. Router 2 receives a Type 7 LSAs from router 3 for its connected subnets

  Correct Answer: C

  From IOS 15.1(2)S onwards, Cisco uses the OSPF path selection order is O > O IA > N1 > E1 > N2 > E2 https://www.cisco.com/c/en/us/support/docs/ip/open-shortest- path-first-ospf/212608-ospf-external-path-selection-external-t.html

• Question 173:

  Refer to the exhibit.

  

  A network operator is getting the route for 10.11.11 0/24 from two upstream providers on #XR3. The network operator must configure #XR3 to force the 10.11.11.0/24 prefix to route via next hop of 10.0.0.9 as primary when available. Which of these can the operator use the routing policy language for, to enforce this traffic forwarding path?

  A. weight of 0 on the prefix coming from 192.168.0.2

  B. lower local preference on the prefix coming from 192.168.0.2

  C. higher local preference on the prefix coming from 192.168.0.1

  D. weight of 100 on the prefix coming from 192.168.0.1

  Correct Answer: A

  Because Weight is the first attribute in path selection algorithm and is 0 for eBGP routes by default. If we set it to 0, router will continue from weight to the bottom, and when comparing neighbor router IDs it will find 192.168.0.1 less than

  192.168.0.2 and st path will be selected as the best

• Question 174:

  Refer to the exhibit.

  

  Which tree does multicast traffic follow?

  A. shared tree

  B. MDT default

  C. source tree

  D. MDT voice

  Correct Answer: B

• Question 175:

  Refer to the exhibit.

  

  After you applied these configurations to routers R1 and R2, the two devices could not form a neighbor relationship. Which reason for the problem is the most likely?

  A. The two routers cannot authenticate with one another.

  B. The two routers have the same area ID.

  C. The two routers have the same network ID.

  D. The two routers have different IS-types.

  Correct Answer: C

  For those asking about the password, area authentication doesn't prevent neighboring to come up because it is carried only in LSP, CSNP and PSNP messages and not in IIH messages. https://www.cisco.com/c/en/us/support/docs/ip/ integrated- intermediate-system-to-intermediate-system-is-is/13792-isis-authent.html

• Question 176:

  Refer to the exhibit.

  

  Which effect of this configuration is true?

  A. It sets the keepalive timer to 30 seconds and the hold timer to 240 seconds.

  B. It sets the keepalive timer to 30 milliseconds and the hold timer to 240 milliseconds

  C. It sets the hold timer to 30 milliseconds and the keepalive timer to 240 milliseconds

  D. It sets the hold timer to 30 seconds and the keepalive timer to 240 seconds

  Correct Answer: A

  Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/command/irg-cr-book/bgp-s1.html#wp1552800140

• Question 177:

  Refer to the exhibit.

  

  A network operator is working to filter routes from being advertised that are covered under an aggregate announcement. The receiving router of the aggregate announcement block is still getting some of the more specific routes plus the aggregate.

  Which configuration change ensures that only the aggregate is announced now and in the future if other networks are to be added?

  A. Configure the summary-only keyword on the aggregate command

  B. Set each specific route in the AGGRO policy to drop instead of suppress-route

  C. Filter the routes on the receiving router

  D. Set each specific route in the AGGRO policy to remove instead of suppress-route

  Correct Answer: A

• Question 178:

  Refer to the exhibit.

  

  When implementing SRv6, which SID does R2 propagate into area 0 for the prefix 2001:DB8:1:1/128?

  A. 120

  B. 230

  C. 110

  D. 10

  Correct Answer: A

• Question 179:

  Refer to the exhibit

  

  An engineer is configuring service traffic from router R1 to R6 as shown. Which additional configuration must the engineer implement so that the LDP and SR domains will participate and interwork with each other?

  A. Router2(config)# segment-routing Router2(config-sr)# ldp mapping-server Router2(config-sr-ms)# prefix-sid-map Router2(config-sr-ms-map)# Router2(config-sr-ms-map-af)# 2.2.2.2/32 500 range 4

  B. Router2(config)# segment-routing Router2(config-sr)# sr mapping-server Router2(config-sr-ms)# ldp-sid-map Router2(config-sr-ms-map)# address-family ipv4 Router2(config-sr-ms-map-af)# 10.1.1.1/32 500 range 50

  C. Router2(config)# segment-routing Router2(config-sr)# mapping-server Router2(config-sr-ms)# prefix-sid-map Router2(config-sr-ms-map)# address-family ipv4 Router2(config-sr-ms-map-af)# 10.1.1.1/32 500 range 50

  D. Router2(config)# segment-routing Router2(config-sr)# ldp mapping-server Router2(config-sr-ms)# prefix-sid-map Router2(config-sr-ms-map)# address-family ipv4 Router2(config-sr-ms-map-af)# 2.2.2.2/32 500 range 40

  Correct Answer: C

  Reference: https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/segment-routing/configuration/guide/b-seg-routing-cg-asr9k/b-seg-routing-cg-asr9k_chapter_01001.html

• Question 180:

  Refer to the exhibit.

  

  

  VPN users that are connected to PE routers are facing network issues. Traffic that originates from CE1 drops before reaching CE2. An engineer finds no outgoing traffic statistics on PE1 and PE2 routers toward CE devices and finds that the PE1 router is running the older software image. Which action must be implemented to resolve the issues?

  A. Enable LDP protocol on PE1 and PE2 routers.

  B. Advertise P1 router loopback on PE1 in OSPF.

  C. Enable CEF-based forwarding on PE1 router.

  D. Advertise PE2 router loopback on PE1 in OSPF.

  Correct Answer: C

  Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_basic/configuration/xe-3s/mp-basic-xe-3s-book/mp-mpls-cisco-rtrs.html