多项选择题

What are two purposes of the AS_PATH attribute?（）

A. route selection
B. loop avoidance
C. determining equal cost paths for reachablilty
D. defining the application of other BGP attributes

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单项选择题

What is the first step in BGP route selection?（）

A. The local router prefers the route with the shortest as-path.
B. The router first verifies that it has a route to the bgp Next Hop IP address.
C. The local router prefers the route from the peer with the lowest peer id address.
D. The local router prefers the route learned from an ebgp peer over a route learned from an ibgp peer.

单项选择题

Two Level 2 routers are exchanging Hello packets with different Area IDs. What occurs between these routers?（）

A. An Adjacency forms.
B. An Adjacency does not form.
C. An Adjacency forms but traffic is not forwarded.
D. No IS-IS PDUs are sent.