Which of following statements are true when a PE connects multiple sites using IS-IS? (Multiple Choice)

• A.IS-IS can enable the authentication function to prevent attacks.
• B.Multiple sites can share the same IS-IS process.
• C.Each site can use a VPN-instance independently from others to guarantee security.
• D.IS-IS can enable the GR feature to improve network stability.

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The following description of the MPLS error?

• A.MPLS 20 tag length is bit, used for message forwarding
• B.LDP MP-BGP 16-1023, etc. The null of the signaling is dynamic protocol label
• C.Adopt mode mode Pipe TTL IP MPLS IP TTL MPLS When the message is transmitted on the network, the value of the message is only at the in and out points.
  Subtraction 1
• D.MPLS S 1 supports multiple nested layer labels, and the innermost layer label is value

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What are the key components of NAC? (Multiple Choice)

• A.Policy server
• B.Communications proxy
• C.NAC device
• D.Access terminal

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A bookstore provides a wired network for customers to learn online. However, some users are suddenly unable to access the network. After troubleshooting, it is found that all the IP addresses in the DHCP address pool have been used up. Which of the following is the best way to solve the problem?

• A.Limit the maximum number of DHCP snooping binding entries that can be learned on an interface.
• B.Configure static ARP binding entries
• C.Configure IP5G
• D.Configure DAI

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Which of the following are legal representations of the IPv6 prefix 12AB00000000CD30? (Multiple Choice)

• A.12AB::CD30/64
• B.12AB::0000:0000:CD30:0000:0000:0000:0000/64
• C.12AB:0:0:CD3/64
• D.12AB::CD3::/64
• E.12AB:0:0:CD3::/64

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