You want to use IS-IS on a GRE interface where the underlying Layer 3 MTU is 1500. Which statement is correct in this scenario?

Question

Options

• AIS-IS can be used because every IS-IS interface must be capable of transmitting packets at least
• BIS IS can be used, but the networking device directly attached to the circuit must be capable of
• CIS-IS cannot be used, but the router can enable a GRE key that serves the same function as IS-
• DIS-IS cannot be used because the IS-IS hello is not allowed to be fragmented and has the DF bit

• A
  13% (6)
• B
  76% (35)
• C
  7% (3)
• D
  4% (2)

Explanation

https://kb.juniper.net/InfoCenter/index?page=content&id=KB7848

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