Which of the following statements about OSPF and IS-IS is wrong?

• A.Both OSPF and IS-IS support area division
• B.Both OSPF and IS-IS are link state protocols
• C.Both DR and BDR need to be elected in the broadcast network
• D.Both OSPF and IS-IS use Hello messages to establish and maintain neighbor relationships

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A network consisting of an existing router R1, router R2, router R3 and router R4. These four routers are interconnected via a LAN network. Basic OSPF is deployed on all four routers. When you execute the command "display ospf peer" on the router R2, the status between router R2 and router R3 is "2way".
What conclusion can you draw from this output? (Multiple Choice)

• A.Router R3 is not DR, nor BDR
• B.Router R2 is DR or BDR
• C.There is no full adjacency between router R2 and router R3.
• D.Router R2 is not DR
• E.Router R4 is DR

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If multiple candidate RPs are configured in a certain group of multicasts, which of the following parameters need to be compared between the multiple candidate RPs? (Multiple Choice)

• A.C-RP priority
• B.Number of the C-RP interface
• C.Group-wide mask length of the C-RP service matching the group address to which the user joins
• D.IP address of the C-RP interface

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As shown in the figure, the AS100 has two paths to the AS400. By default, the best route is transmitted from the AS200. It is known that the path to the AS400 through the AS300 is better. Therefore, the following configuration is performed on the R2. After the configuration is complete, the optimal route is not changed. Which of the following operations can make the configuration take effect?
[R2] ip as-path-filter 1 permit ^400$
R2] route-policy med permit node 10
r2-route-policy] if-match as-path-filter 1
Ir2-route-policy] apply cost 20

• A.Configure deterministic-med in the BGP process of R1.
• B.Configure deterministic-med in the BGP process of R2.
• C.Configure compare- different-as-med in the BGP process of R2.
• D.Configure compare- different-as-med in the BGP process of R1.

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Which of the following statement about the Router-LSA of OSPFv3 is correct? (Multiple choice)

• A.The data area of Router-LSA contains Link-Local address
• B.The data area of Router-LSA contains the interface ID of the local neighbor
• C.Similar to OSPFv2, the Option field exists in the header of the LSA instead of the data area of the Router-LSA
• D.When the LSA header of LS type = 0x0001, represents LSA data area to Router-LSA

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