3com 500 Manual De Usuario

 

 

 

Bridged networks use Spanning Tree Protocol (STP) to provide 

 

network resilience, by retaining redundant links on stand-by, in case 

 

the primary link fails. This means that you are not making maximum 

 

use of available resources. 

 

Routing protocols make each node aware of the primary and alternate 

 

routes available, ensuring that resources are not wasted.

 

Routers have been designed to provide the optimum route through 

 

the network from the workstation through to the destination resource 

 

with which the user wishes to communicate. In a very large network 

 

there could be multiple paths available, and these could change as 

 

dedicated links go in or out of service. These changes in network 

 

topology are handled by routing protocols. However, when using the 

 

ISDN the source network can dial direct to the destination network, 

 

and establish a point-to-point bridged or routed connection. Generally, 

 

when using this type of ISDN dial-up link, routing does not provide 

 

much extra benefit.

 

 

Some organizations are structured into departments determined by the 

 

physical layout of their work environment, so it is natural to divide the 

 

corporate network into separate logical networks. Routing becomes 

 

the obvious candidate for handling these individual LANs.

 

 

The protocol adopted by the Defense Data Network (DDN) for the 

 

Internet, is based on obtaining and abiding by, a registered Internet 

 

address range. This makes a router the ideal choice for accessing the 

 

Internet. Unfortunately, new applicants are likely to only get a 

 

 

 

registered Internet address, preventing more than 254 connections on 

 

one bridged IP LAN.