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Huawei H12-261_V3.0 Exam (page: 11)
Huawei HCIE-Routing & Switching (Written) V3.0 Exam
Updated on: 15-Feb-2026

Viewing Page 11 of 97
H12-261_V3.0 PDF 479 Questions

What is the main reason why RSTP converges faster than STP?

  1. RSTP adds types of port states
  2. RSTP has less overhead
  3. RSTP does not converge based on timers
  4. RSTP has smaller timers

Answer(s): C

Explanation:

RSTPFind and generate an optimal tree topology of the local area network, find topology failures and then recover, automatically update the network topology, enable backup links, while maintaining the best tree structure.



The following is about cross-domain VPN-Option The characteristics of C, the description is correct?

  1. A maximum of two layers of labels are required during packet forwarding.
  2. The ASBRs do not store VPNv4 routes, nor do they advertise VPNv4 routes to each other.
  3. VPN routes are directly exchanged between ingress PEs and egress PEs, without the need for intermediate devices to store and advertise VPN routes.
  4. Cross-domain VPN-Option The C method is not suitable for use when spanning multiple ASs.

Answer(s): B,C

Explanation:

Cross-domain VPN
OPTION A cross-area is also called back-to-back cross-area, that is, the border routers ASBR of two ASs act as PE andCE.
OPTION B Cross-domain also called single-hop MP-EBGP cross-domain, the AS transmits VPN information and builds LSP tunnels through normal MPLS/BGP, and between ASs transmits VPN information and builds LSP tunnels through the single-hop MP-EBGP protocol. OPTION C inter-area is also called multi-hop MP-EBGP inter-area. As long as BGP can establish a TCP connection, it can become a BGP neighbor and transmit routing information. Therefore, OPTION C directly communicates between the source and sink PEs through multi-hop MP-EBGP. The VPN routing information is transferred between the two, and then the LSP public network tunnel is constructed between the source and sink PEs.



Which of the following statements about MPLS is incorrect?

  1. MPLSThe length of the label is 20 bits and is used for packet forwarding.
  2. LDP MP- The label space range of dynamic signaling protocols such as BGP is 16-1023.
  3. in Pipe modeIn the TTL processing mode, IP packets are transmitted on the IPLS network, and the TTL value of IP packets is only divided between MPLS ingress and egress nodes.Don't subtract 1.
  4. MPLS supports multiple levels of label nesting, and the value of the S bit of the innermost label is 1.

Answer(s): B

Explanation:

Label: 20bit, label value range.
S: 1bit, the stack bottom identifier. MPLS supports multiple layers of labels, that is, label nesting.
When the value of S is 1, it indicates the bottommost label.Label space range:
0~15: Special label.
16 to 1023: Static LSP and staticCR-LSP (Constraint-based routed Label SwitchedPath) shared label space. 1024 and above: LDP, RSVP-TE (Resource Reservation Protocol-Traffic Engineering), MP-BGP (MultiProtocol Border Gateway Protocol) and other dynamic signaling protocol label space.



Which of the following operations can achieve fast fault detection on a multicast network? (Multiple Choice)

  1. Shorten Join/PHoldtime of rune messages
  2. lower interface sendTime interval for Hello messages
  3. Establish PI between neighborsM BFD session
  4. Reduce send Join/Prime interval for rune messages

Answer(s): B,C



If the PIM-SM protocol is run in the multicast network, RP needs to be configured. The configuration methods of RP are divided into dynamic RP and static RP. The following description of RP configuration is correct:

  1. configure dynamicWhen the RP is used, the BSR needs to be configured as the backup of the RP.
  2. configure staticWhen an RP is used, the BSR needs to be configured to advertise RP information.
  3. configure staticRP information needs to be specified on all PIM routers.
  4. configure dynamicWhen the RP is used, no BSR needs to be configured.

Answer(s): C

Explanation:

Static RP needs to be specified manually



Viewing Page 11 of 97



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