Two IS-IS routers are exchanging Hello packets with different authentication types. Which of the following is TRUE?

Question

Options

• ADifferent authentication types are not possible because IS-IS only supports password authentication.
• BAn adjacency will not be formed.
• CThe two routers negotiate the authentication type and then reach the up state.
• DOnly an L2 adjacency will form, as long as both routers are L2 capable.

• A
  6% (3)
• B
  76% (41)
• C
  4% (2)
• D
  15% (8)

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