Ccna routing and Switching Complete Study Guide

Compare and contrast UDP and TCP characteristics and features.    TCP is connection-

oriented, acknowledged, and sequenced and has flow and error control, while UDP is con-

nectionless, unacknowledged, and not sequenced and provides no error or flow control.

Understand the role of port numbers.    Port numbers are used to identify the protocol or 

service that is to be used in the transmission.

Identify the role of ICMP.    Internet Control Message Protocol (ICMP) works at the 

Network layer and is used by IP for many different services. ICMP is a management proto-

col and messaging service provider for IP.