| A | B |
| provides network identification through the IP address and routing | IP |
| protocol for the secure version of HTTP uses encryption. | HTTPS |
| provides best efforts delivery of packets. (connectionless communication) | UDP |
| delivers error messages to IP, provides specialized status and routing messages. (Ex. Ping Packets) | ICMP |
| used to manage membership in multicast groups | IGRP |
| resolves IP addresses to MAC addresses. | ARP |
| used by a client to find its IP address. | RARP |
| provides management services, including performance and error statistics and remote control. | SNMP |
| a service used to copy files between machines. | FTP |
| provides terminal emulation to host machines. | Telnet |
| provides e-mail messaging service. | POP3 |
| provides e-mail messaging service. | SMTP |
| provides e-mail messaging service. | IMAP4 |
| protocol for the World Wide Web. | HTTP |
| provides end-to-end guaranteed delivery of packets | TCP |