Networking and Internetworking Devices Anan Phonphoem Ph D

Networking and Internetworking Devices ��. ������ Anan Phonphoem, Ph. D. anan@cpe. ku. ac. th http: //www. cpe. ku. ac. th/~anan Computer Engineering Department Kasetsart University, Bangkok, Thailand

Outline n Network Devices n n Repeater/Hub/Bridge/Router/Gateway Backbone Network n Bus/Star/VLAN 2/ 25

Connecting Devices Networking Devices Repeaters Bridges Internetworking Devices Routers Gateways

Connecting Devices Hub 4/ 25

Repeater • Extend the physical length • No network function has been changed • Location is matter 5/ 25

Function of repeater Repeater is not exactly as same as Amplifier 6/ 25

Hub • Actually is a multiport repeater • Star / Tree Topology 7/ 25

Bridge 8/ 25

Bridge n n n Divide a large network into smaller segment Isolating and controlling the link problems (e. g. congestion) Regenerate signal + Checking Physical Address and forward only to the specified segment 9/ 25

Function of a bridge 10/ 25

Multiport bridge 11/ 25

Routers 12/ 25

Routers in an internet 13/ 25

Routers n n n Act like stations on a network Multi-home Definition (Goal) n n “Learning how to get from here to there. " “Process of discovering, selecting, and employing paths from one place to another (or to many others) in a network” [from David M. Piscitello, Bellcore and A. Lyman Chapin, BBN] 14/ 25

Routing Principle n n Goal: Arriving at the destination Considerations: n n n Direct route (shortest) Reliable route Cheap route Safe route Scenic route 15/ 25

Gateways (protocol converter) 16/ 25

A gateway SNA network (IBM) Netware network (Novell) 17/ 25

Connecting Devices Networking Devices Repeaters Bridges Internetworking Devices Routers Gateways