OSPF is deployed on a campus network to implement network interconnection. An engineer configures R2 as shown in the figure. Which of the following statements is incorrect about LSAs on the OSPF network?
Correct Answer: A
#Analyze the Configuration: [R2] acl 2000 [R2-acl-basic-2000] rule deny [R2] ospf [R2-ospf-1] area 1 [R2-ospf-1-area-0.0.0.1] filter 2000 import [R2-ospf-1-area-0.0.0.1] quit [R2-ospf-1] default-route-advertise always #Understanding Key Concepts: Type 3 LSAs (Inter-Area Routes): Generated by ABRs to advertisesummary routesbetween areas. Filtering Type 3 LSAsis possible using import filters (like in Area 1). Type 5 LSAs (External Routes): Flooded only within the same ASbutdo not enter stub or NSSA areas. #Breakdown of the Options: A: Type 5 LSAs are flooded in Area 1##Incorrect If Area 1 is astub or NSSA, thenType 5 LSAs are not allowed. Although the diagram does not explicitly say Area 1 is a stub/NSSA,real deployments often use stub areas at the edge (like Area 1). More importantly,the filter is applied to Area 1, and there isno redistributionof external routes into Area 1 in the config. Therefore, Type 5 LSAs wouldnot be floodedthere. B: Type 3 LSAs are not flooded in Area 1##Correct The command filter 2000 import with ACL rule deny meansType 3 LSAs are filtered from Area 0 into Area 1. C: Type 3 LSAs are not flooded in Area 2##Correct There isno filter applied to Area 2, so thiscould be false,butsince the question asks for the incorrect statement, this is not the answer. D: Type 5 LSAs are flooded in Area 2##Correct Area 2 is not shown to be stub or NSSA, and there's no filter or restriction configured. Hence,Type 5 LSAs are allowedandflooded in Area 2. #A. Type 5 LSAs are flooded in Area 1.
Question 2
The Next Header field information exists only in the header of an IPv6 message and is used to indicate whether an extended header exists for IPv6
Correct Answer: A
Question 3
In an MPLS IBGP VPN environment, if tags are distributed only through BGP, LDP, the MPLS tags for a message can be up to two layers of tags.
Correct Answer: A
Question 4
Regarding BGP's recognized arbitrary attributes, which of the following descriptions is correct?
Correct Answer: B,D
Question 5
ISIS does not send CSNP packets under the P2P network type during the neighbor establishment process.
