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Which of the following statements are true about the extended features of IS-IS? (Multiple Choice)

Which of the following statements are true about the extended features of IS-IS? (Multiple Choice)
A . IS-IS can choose whether to authenticate and verify the received SNP and LSP packets.
B . If the link state PDUs to be advertised by IS-IS contain a lot of information, the IS-IS router generates more LSP fragments to carry more IS-IS information.
C . After the IS-IS LSP fragment extension function is enabled, the IS-IS process does not need to be restarted.
D . If some devices from other vendors are deployed on the network and these devices do not support the IS-IS LSP fragment extension function, the fragment extension mode must be set to Mode-1; otherwise, the devices from other vendors cannot identify the packets.

Answer: ABD

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