A certain park deployed both IPv4 and IPv6 networks for business testing, and IS-IS was run to achieve network interconnection. IS-IS routing protocol has good scalability and is widely used in existing networks.
Regarding IS-IS scalability, which of the following statements are correct? (Multiple questions)

• A.IS-IS uses TLV structure to construct messages, which makes IS-IS more flexible and expandable
• B.In order for IS-IS to support IPv6, a new TLV needs to be added to carry IPv6 address information
• C.NLPID is a new TLV of IS-IS to support IPv6
• D.For IS-IS, adding new features only needs to add a new TLV

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Which of the following description about the related information of BGP4+ is correct? (Multiple choice)

• A.Modifying the Router ID of the BCP will cause the BGP connection between the routers to be re-established.
• B.The Next Hop attribute in BCP4+ is represented by the Pv6 address, which can be the link-local address of the next hop.
• C.BGP4+ does not support automatic route aggregation.
• D.Bgp4+ can use the dampening command to suppress IBGP routes.

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Regarding the characteristics of CE dual-homing, which of the following statement is incorrect?

• A.The VRFs of two PEs connected to the same CE can belong to different VPNs.
• B.CE accesses the backbone network through two links. These two links can be used for load sharing or as active and standby links.
• C.In CE dual-homing networking, loops may occur, and route-tags can be used to solve loop problems.
• D.CE and PE form a CE dual-homing network, which can ensure high network availability.

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Which of the following role of Link-LSA in OSPFv3 not include?

• A.Notify the router's per-port ID to other routers on the link
• B.Notify other routers on the link of the options set in the Network LSA originating from this link
• C.Advertise the link-local address of this interface to other routers on the link
• D.Advertise the IPv6 prefix list of this port to other routers on the link

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Which of the following are used in Ethernet networks? (Multiple Choice)

• A.802.5 encapsulated frames.
• B.802.3 encapsulated frames
• C.Non-Canonical format MAC addresses.
• D.CSMA/CD for media access.
• E.Canonical format MAC addresses.

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