CST(9)-Road to Bandwidth Heaven

A physical network is a collection of communication links, cable, routers, switching equipment and the transport stacks that glue it all together .Networks can be divided into broad categories – Local Area Network (LAN) that cover short distances typically a building or campus and Wide Area Networks(WAN) that cover extended geographically areas .This section explains how LANs and WANs are interconnected into global backbones

Bridges ,Routers and Gateways

Transport stacks for examples, TCP/IP, NetBIOS, IPX/SPX, DECnet, AppleTalk, and SNA/APPN provide reliable end-to-end communication across WANs and LANs. These protocols provide end-to-end networking on a global scale using LAN/WAN/LAN interconnect technology such as routers, bridges and gateways.

Bridges are computers or devices that interconnect LANs using Link Layer Routing Information and Physical addresses. Protocols that do not support internetworking like NetBIOS are bridged.

Routers interconnect LANs using protocol dependent routing information. Routers create and maintain dynamic routing table of the destinations they know. They are typically used with protocols that support network layer such as TCP/IP, IPX/SPX, APPN .XNS, AppleTalk and OSI. Multi-protocol routers support different combination of network layer protocols.

Bridge /Routers are single device that combine the functions of bridges and routers. Gateways are devices that perform brute force translation between protocols.
CST(9)-Road to Bandwidth Heaven Reviewed by 1000sourcecodes on 21:46 Rating: 5
Powered by Blogger.