What are two purposes of the AS_PATH attribute?（）

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.

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.

A. show iso neighbor
B. show isis neighbor
C. show iso adjacency
D. show isis adjacency