A.UDP port 179.

B.UDP port 22.

C.TCP port 179.

D.TCP port 22.

A.config router static-route 10.2.3.2 next-hop 0.0.0.0/0

B.config router static-route 0.0.0.0 next-hop 192.168.2.0

C.config router default-route 10.2.3.2

D.config router static-route 0.0.0.0/0 next-hop 10.2.3.2

E.config router static-route 0.0.0.0 next-hop 10.2.3.2

A.BGP

B.OSPF

C.IS-IS

D.Ethernet

E.X.500

A.MAC address of the default gateway.

B.IP addresses of all DHCP servers.

C.IP addresses offered to the client.

D.IP addresses of other DHCP clients.

A.9 broadcast domains, 3 collision domains.

B.3 broadcast domains, 3 collision domains.

C.1 broadcast domain, 9 collision domains.

D.3 broadcast domains, 9 collision domains.