QUESTION: 33

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?

Add interface to OSPSend Hello message immediately after area F
LSUpdate packets are only sent when adjacency is established
After receiving the LsUpdate message, the router must send LsAck to confirm
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.

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QUESTION: 34

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

ASBR cannot be stored in stub area.
Virtual connections cannot pass through stubsarea.
Type injection is not allowed in stub area7 LSA
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

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QUESTION: 35

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

Type7
Type5
Type4
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.

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QUESTION: 36

There is an existing router running OSPF connected to Area 0 and Area 1. You have configured area 1 as a stub are

What types of LSAs only operate in area 1?
Category 7 LSA
Type 1 LSA and Type 2 LSA
Type 1 LSA, Type 2 LSA and Type 5 LSA
Type 3 LSA and Type 4 LSA
Type 1 LSA, Type 2 LSA and Type 3 LSA

Answer(s): E

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