As shown in the figure, an engineer uses four routers to test the interoperability of branch networks, where R1, R2, and R3 in branch 1 deploy OSPF Network interoperability is implemented, and R, R3, R4 in Branch 2 is deployed is-IS to achieve network interoperability. Now that the engineer wants to implement R1 access to R4's loopback address, which of the following actions will meet this requirement?

• A.Publish the default route only in the IS-IS process of R2
• B.No configuration is required
• C.Publish default routes only in the OSPF process for R2
• D.In the OSPF process of R2 and the IS-IS process, the default routes are published separately

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The network administrator defines a traffic policing policy as follows:

• A.80128 bytes
• B.48128 bytes
• C.32K bytes
• D.256K bytes

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What improvements have been made to the IGMPv2 protocol compared to IGMPv1? ( Multiple Choice)

• A.Added specific group query message
• B.Added high group messages
• C.Added maximum response time field
• D.Added a specific source group query packet

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OSPFv2 is an IGP running on IPv4 networks, whereas OSPFv3 is an IGP running on IPv6 networks. OSPFv2 and OSPFv3 have similar LSA types, but their LSA functions are slightly different. Which of the following is not an OSPFv3 LSA type?

• A.ASBR-Summary-LSA
• B.AS-External-LSA
• C.Router-LSA
• D.Network-LSA

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If SRv6 needs to be deployed on a bearer WAN, which of the following technologies are required? (Select all that apply)

• A.MPLS
• B.BGP
• C.IGP
• D.BGP-LU

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