350-501 practice questions 41–50

1. Question 41 · 377 in bank

   Select 2

   Which two actions describe LSP delegation to PCE servers? (Choose two.)

   • Aremoving TE re-optimization timer timeouts
   • Bchanging the precedence of any of the PCE servers
   • Centering the mpls traffic-eng reoptimize command
   • Dadding a new PCE server with lower precedence than the primary PCE
   • Eadding a new PCE server with higher precedence than the primary PCE

   Show answer

   Answer: CD

   Explanation

   i Think this is B and C The question does not specify which PCE server is to be the primary. so technically both D and E are correct depending on what you want to accomplish. if you want the Primary PCE to remain the primary then add a PCE with a higher precedence. If you want the Primary PCE to switch to the new PCE then set it at a lower precedence. For this reason is why i think the answer is B and C. Triggering PCE server precedence re-evaluation A change in a PCE server’s precedence is not considered a PCE server failure. So, the change in precedence does not trigger a redelegation timeout or a re-evaluation of LSP delegation to the PCE server at a PCC. Re-evaluation of LSP delegation to PCE servers after CLI reconfiguration is controlled by the TE reoptimisation timer. By default, the TE reoptimisation timer is set to 3600 seconds. You can accelerate the re-evaluation of LSP delegation from a PCC to PCE servers after you have changed the precedence of PCE servers or added new PCE servers. To do so, manually trigger TE reoptimisation.

   Source: Adapted from community discussion — rm868

   References

   • Cisco documentation

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2. Question 42 · 377 in bank

   Which feature will an operator use while implementing MPLS TE on customer's network, to prevent an LSP from using any overseas links?

   • Abandwidth
   • BSLRG
   • Cexplicit path
   • Daffinity

   Show answer

   Answer: D

   Explanation

   The basic idea about MPLS TE affinity is to add an attribute to a link and be able to include or exclude this link during path calculation. The concept is also known as link coloring. https://zartmann.dk/mpls-te-affinity/

   Source: Adapted from community discussion — Wrecking_ball

   References

   • Cisco documentation

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3. Question 43 · 377 in bank

   

   Refer to the exhibit. An engineer began to configure LDP between R1 and R2, but R1 and R2 cannot yet establish an LDP TCP connection. Which additional task must be completed to finish the implementation?

   • AConfigure the mpls ldp neighbor 10.0.12.1 password command on R1
   • BConfigure the mpls ldp neighbor 172.16.0.1 password command on R1
   • CConfigure the no mpls ldp password option 1 command on R1
   • DConfigure the no mpls ldp password option 1 command on R2

   Show answer

   Answer: D

   Explanation

   I think D. We see on R2 under the interfaces that it sees for R1 that R2 is configured for "Password :not required, option 1, in use" meaning that R2 has a password configuration using option 1 configured but on R1 it has "non". To fix it you need to remove the password option 1 command on R2.

   Source: Adapted from community discussion — thejag

   References

   • Cisco documentation

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4. Question 44 · 377 in bank

   After implementing MPLS protocol for multiple VRFs on a single Cisco device, the engineer notices all VRFs on the router still do not have the LDP session protection feature enabled. Which configuration must the engineer apply to enable the LDP session protection feature for LDP neighbors within each VRF?

   • AConfigure LDP session protection globally on the device only.
   • BConfigure LDP session protection within the individual VRFs.
   • CConfigure LDP session authentication on the device to enable LDP session protection on each VRF automatically.
   • DConfigure LDP session protection globally on the device and on each neighbor that requires session protection.

   Show answer

   Answer: A

   Explanation

   Correct answer is B. You can use the vrf keyword to select which virtual routing and forwarding (VRF) instance is to be protected if the device is configured with at least one virtual private network (VPN) VRF instance. You cannot specify more than one VRF with the mpls ldp session protection command. To specify multiple VRFs, issue the command multiple times. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_ldp/configuration/15-s/mp-ldp-15-s-book/mp-ldp-sessn-prot.pdf

   Source: Adapted from community discussion — spyroskanel89

   References

   • Cisco documentation

   Next question

5. Question 45 · 377 in bank

   What is a constraint of Cisco MPLS TE tunnel configurations?

   • AQoS-aware tunneling is not supported.
   • BTunnels cannot be configured over IP unnumbered links.
   • CWith ISIS as an IGP, only older-style metrics are used.
   • DTunnels cannot span multiple OSPF areas.

   Show answer

   Answer: B

   Explanation

   Answer is B, https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_te_path_setup/configuration/xe-16-12/mp-te-path-setup-xe-17-book/mpls-traffic-engineering-and-enhancements.html The MPLS traffic engineering feature does not support routing and signaling of LSPs over unnumbered IP links. Therefore, do not configure the feature over those links.

   Source: Adapted from community discussion — [Removed]

   References

   • Cisco documentation
   • Cisco documentation
   • Cisco documentation
   • Cisco documentation

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6. Question 46 · 377 in bank

   An engineer is implementing MPLS OAM to monitor traffic within the MPLS domain. Which action must the engineer perform to prevent packets from being forwarded beyond the service provider domain when the LSP is down?

   • AConfigure a private IP address as the destination address of the headend router of Cisco MPLS TE.
   • BDisable IP redirects only on outbound interfaces.
   • CDisable IP redirects on all ingress interfaces.
   • DImplement the destination address for the LSP echo request packet in the 127.x.y.z/8 network.

   Show answer

   Answer: D

   References

   • Cisco documentation
   • Cisco documentation

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7. Question 47 · 377 in bank

   Select 2

   A network engineer has configured TE tunnels in the MPLS provider core. Which two steps ensure traffic traverse? (Choose two.)

   • AECMP between tunnels allows RSVP to function correctly.
   • BThe IGP metric of a tunnel is configured to prefer a certain path.
   • CA tunnel weight is configured in SPF database the same way as a native link.
   • DStatic route is the only option for directing traffic into a tunnel.
   • EForwarding adjacency feature allows a tunnel to be installed in the IGP table as a link.

   Show answer

   Answer: BE

   Explanation

   To include tunnels in the SPF calculations, use forwarding adjacencies. Forwarding adjacency is a mechanism to allow the announcement of established tunnels via IGP:

   Source: Adapted from community discussion — ccie_race

   References

   • Cisco documentation

   Next question

8. Question 48 · 377 in bank

   An engineer is implementing a Cisco MPLS TE tunnel to improve the streaming experience for the clients of a video-on-demand server. Which action must the engineer perform to configure extended discovery to support the MPLS LDP session between the headend and tailend routers?

   • AConfigure a targeted neighbor session.
   • BConfigure an access list on the interface to permit TCP and UDP traffic.
   • CConfigure a Cisco MPLS TE tunnel on both ends of the session.
   • DConfigure the interface bandwidth to handle TCP and UDP traffic between the LDP peers.

   Show answer

   Answer: A

   Explanation

   A is the best match for me. Anyone agree or disagree? If the LSR is more than one hop from its neighbor, it is nondirectly connected to its neighbor. For these nondirectly connected neighbors, the LSR sends out a targeted Hello message as a UDP packet, but as a unicast message specifically addressed to that LSR. The nondirectly connected LSR responds to the Hello message and the two routers begin to establish an LDP session. This is called EXTENDED DISCOVERY. An MPLS LDP targeted session is a label distribution session between routers that are not directly connected. When you create an MPLS traffic engineering tunnel interface, you need to establish a label distribution session between the tunnel headend and the tailend routers. You establish nondirectly connected MPLS LDP sessions by enabling the transmission of targeted Hello messages. You can use the ****mpls ldp neighbor targeted****command to set up a targeted session when other means of establishing targeted sessions do not apply, such as configuring mpls ip on a traffic engineering (TE)....

   Source: Adapted from community discussion — thejag

   References

   • cisco.com documentation
   • Cisco documentation

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9. Question 49 · 377 in bank

   What is a characteristic of prefix segment identifier?

   • AIt contains the interface address of the device per each link.
   • BIt contains a router to a neighbor.
   • CIt is locally unique.
   • DIt is globally unique.

   Show answer

   Answer: D

   Explanation

   A prefix segment is a global segment, so a prefix SID is globally unique within the segment routing domain. An adjacency segment is a local segment, so the adjacency SID is locally unique relative to a specific router. https://www.cisco.com/c/en/us/td/docs/iosxr/ncs5500/segment-routing/61x/b-segment-routing-cg-ncs5500/b-segment-routing-cg-ncs5500_chapter_01.pdf

   Source: Adapted from community discussion — thejag

   References

   • Cisco documentation

   Next question

10. Question 50 · 377 in bank

    Which configuration modifies Local Packet Transport Services hardware policies? A.

    

    B.

    

    C.

    

    D.

    

    This is an interactive task on the real exam — a drag-and-drop, hotspot or ordering question. There is nothing to select here, so the answer is shown below for reference.

    Show the answer figure

    Answer:

    Explanation

    Reference: https://www.cisco.com/c/en/us/td/docs/routers/crs/software/crs_r4-1/addr_serv/command/reference/b_ipaddr_cr41crs/ b_ipaddr_cr41crs_chapter_0111.html#wp1754734006

    References

    • Cisco documentation
    • cisco.com documentation

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350-501 practice, question 41. 377 questions available.