Huawei H12-261_V3.0 Exam (page: 7)
Huawei HCIE-Routing & Switching (Written) V3.0 Exam
Updated on: 15-Feb-2026

Viewing Page 7 of 97

Which of the following information can be included in a basic network layer packet? (Multiple Choice)

  1. data link layer header
  2. upper layer data
  3. network layer header
  4. path record
  5. network layer tail

Answer(s): B,C

Explanation:

The packet has not been encapsulated into the data link layer, so there is only the network layer header and upper layer data. As for the path record and the tail of the network layer, these do not exist.



The description about configuring BGP4+ is correct: (Not sure)

  1. BGP4+ does not support route reflectors.
  2. The next hop of a BGP4 route can use Link-Local address.
  3. BGP4When configuring the reflector, the roles of the reflector and the client must be the same as the BCP4 configuration.
  4. BGP4 specifies peer must use Link-Local address.
  5. BGP4+ ofThe Router-ID is the same as the Router-ID of BGP4.

Answer(s): B,E

Explanation:

BGP4+ is BGP (Border Gateway Protocol) is an extension of IPv6 unicast network to control the propagation and selection of routes in IPv6 unicast network.
BGP4+ supports RR.



The OSPF protocol runs on a company's network. An engineer performs packet diversion operations on the network in order to gain a deeper understanding of the OSPF mechanism.
Which of the following descriptions about OSPF packets is correct?

  1. Add interface to OSPSend Hello message immediately after area F
  2. LSUpdate packets are only sent when adjacency is established
  3. After receiving the LsUpdate message, the router must send LsAck to confirm
  4. LS Update packets synchronize the link state database by sending detailed LSA information

Answer(s): A,D

Explanation:

LSUpdate: The LSU packet is used to send the LSA it needs to the peer device or to flood the updated LSA of the local end. The content is a collection of multiple LSAs (all contents). In order to achieve reliable transmission of flooding, an LSAck packet is required to Confirmation, for those who have not received the confirmation messageLSAFor retransmission, the retransmitted LSA is sent directly to the neighbor.
LSACK: The LSAck packet is used to confirm the received LSU packet, and the content is the header of the LSA to be confirmed (one LSAck packet can confirm multiple LSAs). After receiving the LSU message, depending on the situation, what is returned to the other party is different, not just the LSACK message, as follows:
if LSThere is no such entry in the DB, it is added to the LSDB, a link state acknowledgment (LSAck) is returned, and this information is diffused to other routers, running the SPF algorithm and updating their routing tables.
ifIf there is such an entry in the LSDB and the information contained in the LSU is the same, it is ignored.

ifIf there is such an entry in the LSDB, but the information contained in the LSU is updated, it is added to the local LSDB, an LSAck is returned, and the information is diffused to other routers, SPF is run, and its routing table is updated.
ifIf there is such an entry in the LSDB, but the information contained in the LSU is older, an LSU containing the new information is sent to the sender.



Regarding the stub area in the OSPF protocol, the following statements are correct:

  1. ASBR cannot be stored in stub area.
  2. Virtual connections cannot pass through stubsarea.
  3. Type injection is not allowed in stub area7 LSA
  4. The backbone area cannot be configured as a stubarea.

Answer(s): A,B,C,D

Explanation:

The stub stub area cannot import external routes and type 5 LSAs, and cannot have ASBsR, Class 7 LSAs are also not allowed



OSPF There will definitely not be a type of LS in the stub areaA

  1. Type7
  2. Type5
  3. Type4
  4. Type3

Answer(s): A,B,C

Explanation:

The stub stub area cannot import external routes and type 5 LSAs, and cannot have ASBsR, also does not allow Type 7 LSAs, so there is no Type 4 LSA either.



Viewing Page 7 of 97



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