81.  What is Gateway-to-Gateway protocol?

82.  What is NVT (Network Virtual Terminal)?

83.  What is a Multi-homed Host?

84.  What is Kerberos?

85.  What is OSPF?

86.  What is Proxy ARP?

87.  What is SLIP (Serial Line Interface Protocol)?

88.  What is RIP (Routing Information Protocol)?

89.  What is source route?