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CCNA Quick Reference Sheets (CCNA Exam 640-802) by Jim Doherty, Eric Rivard

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Chapter 4. Routing Operations and VLSM

Routing Overview

Routing is the process of getting packets and messages from one location to another.

A router needs the following key information, as displayed in Figure 4-1:

  • Destination address: The destination (typically an IP address) of the information being sent. This includes the subnet address.

  • Possible routes: Likely routes to get from source to destination.

  • Best route: The best path to the intended destination.

  • Status of routes: Known paths to destinations.

Information Needed by Router for Routing

Figure 4-1. Information Needed by Router for Routing

A router is constantly learning about routes in the network and storing this information in its routing ...

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