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Free H31-161 Exam Braindumps
HCIE-Carrier IP (Written) Questions 31–35 (page: 8)

Updated On: 10-Feb-2026
Page 8 of 37
PDF with 180 Questions

Exhibit:



As shown in the figure, RTA connects to RTB and RTC A TE tunnel is configure on RTA to reach RTC. The TE tunnel cannot be successfully established. However, CSPF-based calculation is successful and RTA does not receives any PathErro messages.
What are possible causes?

  1. An interface address on RTP is the same as the address of interface RTA-1.
  2. RSVP-TE is not configured at interface RTB-2.
  3. Different authentication keys are configured on interface RTB-2 and RTC-1.
  4. The reserved bandwidth is insufficient at interface RTB-2

Answer(s): D



Which of the following statements about BFD for MPLS LSP are true?

  1. An MPLS LSP may be unidirectional .If BFD packets are transmitted along an MPLS LSP in the forward direction., these packets may be forwarded over IP in the reverse direction. Then the forward and reverse paths of a packet may be different As a result, when a fault occurs on the reverse path, BFD detects and reports the fault even if the MPLS LSP is normal.
  2. In BFD for MPLS LSP, LSP Ping is used to negotiate the identifier and parameters of a BFD session.
  3. BFD for MPLS LSP detects faults only on the forwarding plane. LSP Ping, however, can not only detect faults on the forwarding plane, but also find out inconsistencies between the forwarding plane and the control plain- Therefore, they are often combined for a better fault detection solution.
  4. If MPLS LSPs work in load balancing mode, a BFP session should be triggered on each LSP in principle. Only one BFD session. however, can be initialed for load-balancing MPLS LSPs to an intermediate node In this case, the forwarding path ol BFD packets may be different from what expected. As a result may be reported or missed.

Answer(s): A,C,D



Which statement about the MPLS LSP Ping is true?

  1. The LSP Ping Echo request must contain the downstream mapping TLV
  2. A unique Sender's Handle is generated during each LSP Ping operation
  3. A unique sequence number is generated during each LSP Ping operation
  4. The LSP Ping Echo request may contain the FEC stack TLV

Answer(s): B



Which statement about the MPLS LSP traceroute is true?

  1. The destination IP address if an Echo request sent by the LSP traceroute is the IP address of the corresponding FEC.
  2. The downstream mapping TLV is used to carry downstream information of the correct node.
  3. Echo request route sends by the LSP traceroute can cay multiple downstream mapping TLVs.
  4. The egress route sends back an reply packet containing the downstream mapping TLV if the receives Echo request contains the downstream mapping TLV.

Answer(s): B



Exhibit:



RTA is an edge route of the MPLS backbone network. It provides the access for users under layer 2 switches and differentiates user by subinterface. User access VALN 100 and has subscribed to the His ViIP , and services. According to 802 1p priorities, the value 0 indicates the HIS service, 1 indicates the VoIp service and 4 indicate the IPTV service. The DiffSerc model is deployed in E-LSP mode on the MPLS network,
And the STC is configured for subinterface on the access side of RTA (the qos phb disable command is not configured). Outgoing on the traffic on the G1/0/0.1 suninterface involves the His VoIP, and services on the access side of RT

  1. Which statements about EXP about values corresponding to these three services is true?
  2. At least three EXP values be contained, and the values are uncertain.
  3. Only two EXP values be contains, and the values are certain.
  4. The EXP values must be 0, 1, and 4.
  5. Only one EXP may be contained, and the value is uncertain

Answer(s): A



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