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Huawei H12-261_V3.0 Exam (page: 4)
Huawei HCIE-Routing & Switching (Written) V3.0 Exam
Updated on: 25-Dec-2025

Viewing Page 4 of 97
H12-261_V3.0 PDF 479 Questions

If PIM-SM is run in a multicast network, a multicast forwarding tree needs to be built between the multicast source and the receiver so that the receiver can receive the multicastvalid data, which of the following options are correct for the built tree tracing?

  1. multicast source andThe SPT tree is constructed between RPs
  2. The RPT tree is constructed between the RP and the receiver
  3. multicast source andThe RPT tree is constructed between RPs
  4. The SPT tree is constructed between the RP and the receiver

Answer(s): A,B

Explanation:

Build source tree SPT between multicast source and RP Build shared tree RPT between RP and receiver
Finally, the source tree SRT is constructed between the multicast source and the receiver



Below about BSK/Is the description of the RP mechanism correct?

  1. PIM- There can be multiple C-BSRs in the SM domain, but only one BSR can be elected
  2. BSR collects C-RP information from received C-RP packets
  3. BSR floods the PIM with Bootstrap packets All routers in the SM domain advertise BSR information andC-RP information
  4. OneC-BSR can also collect C-RP information from received C-RP packets

Answer(s): A,B,C

Explanation:

BSAll C-RPs will be sorted out after the election of R is completed.



Which of the following statements about LDP reliability is incorrect?

  1. LDP GR (Graceful Restart) utilizes the feature that the forwarding plane and the control plane of the LS are high, and realizes the switchover of the device during protocol restart or active/standby switchover.uninterrupted
  2. By default, the manually configured LDP FRR policy is a 32-bit backup route that triggers LDP to establish a backup LSP.
  3. by LDP FRR can also generate LSPs for label mappings from non-optimal next hops, and create forwarding entries as backups of the primary LSPs
  4. LDP and IGP are associated with each other, and the IGP needs to suppress the advertisement of routes to ensure that the LDP and LGP paths are consistent.

Answer(s): B

Explanation:

FRR (Fast Reroute, fast re-routing) is designed to provide backup protection for these important nodes or links when links or nodes in the network fail, realize fast re-routing, reduce the impact on traffic when links or nodes fail, and enable traffic to achieve Quick recovery.



Which of the following descriptions about the LDP session establishment process is correct? (multiple choice)

  1. When both parties receive the Keepalive message from the peer, LThe DP session is established successfully.
  2. LThe hello message discovered by DP neighbors uses TCP packets, and the destination address is the multicast address 224.0.0.2.
  3. TCPAfter the connection is established successfully, the active party sends an initialization message to negotiate the relevant parameters for establishing an LDP session.
  4. The party with the larger transport address, as the active party, initiates the establishment of a TCP connection.

Answer(s): A,C,D

Explanation:

LThe DP link Hello message uses UDP packets, and the destination address is the multicast address

224.0.0.2.
pass throughAfter the Hello message discovers the neighbor, an LDP session is established between the LSRs. After a session is established, LDP peers maintain this session by continuously sending Hello messages and Keepalive messages.



RD is used to distinguish the same IP address in different VPNs. How many bits does RD contain?

  1. 64
  2. 32
  3. 16
  4. 128

Answer(s): A

Explanation:

RD (Route Distinguisher):
Used to identify different VPN instances on PEs, and its main function is to implement VPAddress multiplexing between N instances, together with the IP address to form 12 BytesVPNv4 address. RD has 64 bits and IP address is 32 bits, which together constitute 96 bits of VPNV4 address. VPNV4 address 12 bytes = 8 bytesRD +4 bytes IPV4 address RD is carried along with routes in BGP It is sent to the peer end in an Update message. RD does not have the ability to select routes and does not affect the sending and receiving of routes. RD is used to distinguish local VRFs and is valid locally.
RT (Route Target)
RT is an important attribute carried by VPNv4 routes. It determines the sending, receiving and filtering of VPN routes. PEs rely on the RT attribute to distinguish routes between different VPNs. The length is also 64 bits.
when from VWhen exporting VPN routes in the RF table, use Export RT marks VPN routes.
When importing a VPN route into the VRF table, only the RT tag and any Import in the VRF table Only the routes that match the RT will be imported into the VRF table.



Viewing Page 4 of 97



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