350-501 practice questions 21–30

1. Question 21 · 377 in bank

   

   Refer to the exhibit Which effect of this configuration is true?

   • AR1 can support a peer that is configured for LDP SSO/NSF as the peer recovers from an outage.
   • BR1can support a graceful restart operation on the peer, even if graceful restart is disabled on the peer.
   • CR1 can failover to any peer.
   • DR1 can failover only to a peer that is configured for LDF SSO/NSF.

   Show answer

   Answer: A

   Explanation

   Reference: https://www.cisco.com/en/US/docs/general/Test/kwoodwar/fsgr29s.html

   References

   • Cisco documentation

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2. Question 22 · 377 in bank

   You are testing the capabilities of MPLS OAM ping. Which statement is true?

   • AAn LSP is not required for the reply to reach the ingress MPLS router.
   • BAn LSP breakage results in the ingress MPLS router never receiving any reply.
   • CMPLS OAM ping works solely with P2P LSPs.
   • DMPLS OAM ping works solely with Cisco MPLS TE.

   Show answer

   Answer: A

   Explanation

   Reference: https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k_r5-3/mpls/configuration/guide/b-mpls-cg53x-asr9k/b-mpls-cg53x- asr9k_chapter_01000.html

   Source: Adapted from community discussion — blizzlondon

   References

   • Cisco documentation
   • Cisco documentation

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3. Question 23 · 377 in bank

   

   Refer to the exhibit. R1 is connected to two service providers and is under a DDoS attack. Which statement about this design is true if URPF in strict mode is configured on both interfaces?

   • AR1 drops all traffic that ingresses either interface that has a FIB entry that exits a different interface.
   • BR1 drops destination addresses that are routed to a null interface on the router.
   • CR1 permits asymmetric routing as long as the AS-PATH attribute entry matches the connected AS.
   • DR1 accepts source addresses on interface gigabitethernet0/1 that are private addresses.

   Show answer

   Answer: A

   References

   • Cisco documentation

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4. Question 24 · 377 in bank

   In an MPLS network, which protocol can be used to distribute a Segment Prefix?

   • ALDP
   • BEIGRP
   • COSPF
   • DRSVP-TE

   Show answer

   Answer: C

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5. Question 25 · 377 in bank

   

   Refer to the exhibit. With which router does IOSXRV-1 have LDP session protection capability enabled but session hold up is not active?

   • A192.168.0.4
   • B192.168.0.5
   • C192.168.0.1
   • D192.168.0.3

   Show answer

   Answer: B

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6. Question 26 · 377 in bank

   

   Refer to the exhibit. A network operator working for service provider with an employee id: 1234:56:789 applied this configuration to a router. Which additional step should the engineer use to enable LDP?

   • AEnable MPLS LDP on the interface.
   • BDisable Cisco Express Forwarding globally.
   • CDelete the static router ID.
   • DConfigure the both keyword to enable LDP globally.

   Show answer

   Answer: A

   References

   • Cisco documentation

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7. Question 27 · 377 in bank

   Which utility can you use to locate MPLS faults?

   • AMPLS LSP ping
   • BQoS
   • CMPLS traceroute
   • DEEM

   Show answer

   Answer: C

   Explanation

   These iNE guys answer this question like this: "Two classic network utilities – ping and traceroute – form the basis of almost any layer 3 troubleshooting process. The first operation allows validating end-to-end connectivity and the second allows detecting the point where the network path breaks". https://ine.com/blog/2008-11-24-mpls-ping-and-traceroute I go by option "C" too.

   Source: Adapted from community discussion — Mephystopheles

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8. Question 28 · 377 in bank

   When configuring traffic engineering tunnels in Cisco MPLS core network, you see the traffic is not tacking the expected path in the core. Which command do you use to quickly check path of a TE tunnel?

   • Atraceroute <tunnel destination IP>
   • Bshow mpls traffic-engineering tunnels
   • CPing <tunnel destination IP>
   • Dtraceroute mpls ipv4 <tunnel destination>

   Show answer

   Answer: D

   Explanation

   show mpls traffic-engineering tunnels will clearly show the signaled path, explicit or dynamic, but "quickly" as a keyword probably suggests the traceroute answer is more correct

   Source: Adapted from community discussion — iliveinspace

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9. Question 29 · 377 in bank

   

   Refer to the exhibit. When implementing an LDP protocol, an engineer experienced an issue between two directly connected routers and noticed that no LDP neighbor exists for 1.1.1.1. Which factor should be the reason for this situation?

   • ALDP needs to be enabled on the R2 loopback interface.
   • BLDP needs to be enabled on the R2 physical interface.
   • CR2 does not see any hellos from R1.
   • DR2 sees the wrong type of hellos from R1.

   Show answer

   Answer: B

   Explanation

   The answer is B.. you have to have a transport IP which is the interface that is used to actually send the hellos. You are configured with a targeted session but MPLS is not passing on the interface, that's why it will show you sending hellos but it's not FORWARDING them.

   Source: Adapted from community discussion — Net_Dio

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10. Question 30 · 377 in bank

    

    Refer to the exhibit. Which statement about this configuration is true?

    • AIt requires a dynamic Cisco MPLS TE path to be configured for the tunnel to run.
    • BIt requires OSPF to also be running to have optimized Cisco MPLS TE tunnels.
    • CIt is the configuration for the head-end router of a Cisco MPLS TE tunnel with segment routing.
    • DIt requires an explicit Cisco MPLS TE path to be configured for the tunnel to run.

    Show answer

    Answer: C

    References

    • Cisco documentation

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350-501 practice, question 21. 377 questions available.