04-06-2012, 11:59 AM
IP Based Network Concepts and Overview
IP_BASICS.ppt (Size: 1.06 MB / Downloads: 35)
Introduction
Standalone computers.
Computers in a network.
Different applications/services between computers: e-mail, File Transfer, Remote Login, Web Surfing, Network Management, chatting, playing games etc.
To achieve interworking between computers & other devices like servers, routers etc the computer is made to work in a hierarchical manner ie it is to work as a layered model. Each layer doing certain functionalities & offering services to its upper layer.
IP Protocols
Internet or IP technology over the years has emerged as the most prominent data communication technology.
TCP/IP protocol has become de-facto data comm standard throughout the world.
It can carry even voice/video also over IP protocol and in turn has started challenging the complete monopoly of TDM technology in voice communication.
Internet Control Message Protocol
Internet Control Message Protocol is a mechanism used by hosts and routers to send notification of datagram problems back to the sender.
Sends error messages only to the source and not to intermediate routers.
Sole function is to report problems, not to correct them.
ICMP (Ping- Packet Internet Gropher) uses echo/reply to test whether a destination is reachable and responding.
Address Resolution Protocol
Address Resolution Protocol is used to translate 32 bits IP addresses to 48 bits Ethernet addresses.
A host’s physical address is determined by broadcasting its IP address to all machines.
The machine with matching IP address, in broadcast message, sends its hardware address to the machine originating broadcast.