Data Communication

and Computer Networks[EEE 314]

Mubashir Husain RehmaniMubashir Husain Rehmani

Assistant Professor

Department of Electrical Engineering

COMSATS Institute of Information Technology,

Wah Cantt, Pakistan

Server

� Server: Dedicated device to perform specific

tasks in support of other computers on the

network

� File Server� File Server

� Allow to share files

� Print Server

� Control a single or group of printers

� Application Server

� To access and use extra computing power and softwares

Few Definitions

� Client

� A client is a device use only to request services from a network service provider

� Server� Server

� Provides services to service requestors

� Peer

� Both request and provide network services

Communication between

Computers

� Connectionless Communication

� Do not guarantee delivery

� Faster compared to connection-oriented

� Example: ordinary postal service� Example: ordinary postal service

� IP, UDP, IPX

� Connection-Oriented Communication

� Guarantee delivery

� Slower compared to connectionless

� Example: Registered Courier

� TCP, SPX, X.25

SLIP and PPP

� SLIP: Serial Line Internet Protocol

� Used to transmit IP packet over serial lines and telephone connections

� As part of dial-up connection� As part of dial-up connection

� Supports TCP/IP only

� Do not support encryption

� PPP: Point-to-Point Protocol

� Used to transmit IP packet over serial lines and telephone connections

� Supports multiple protocols

� Support encryption

IEEE 802 Standard

IEEE 802.1 Internetworking and Management

IEEE 802.2 Logical Link Control

IEEE 802.3 CSMA/CD or Ethernet

IEEE 802.4 Token Bus LAN

IEEE 802.5 Token Ring LANIEEE 802.5 Token Ring LAN

IEEE 802.6 MAN

IEEE 802.7 Broadband Technical Advisory Group

IEEE 802.8 Fiber-Optic Technical Advisory Group

IEEE 802.9 Integrated Voice/Data Networks

IEEE 802.10 Network Security

IEEE 802.11 Wireless Networks

IEEE 802.1 Demand Priority Access LAN