This document discusses data communication and computer networks. It defines servers as dedicated devices that perform specific tasks to support other computers on a network, including file servers, print servers, and application servers. It defines clients as devices that only request services from a network provider and servers as devices that provide services to clients. It describes connectionless communication as not guaranteeing delivery but being faster than connection-oriented communication, which guarantees delivery but is slower. It also discusses SLIP and PPP protocols for transmitting IP packets over serial lines and telephone connections, and provides an overview of some IEEE 802 standards for networking.

1. 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

2. Server
Server: Dedicated device to perform specific
tasks in support of other computers on the
network
File ServerFile 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

3. Few Definitions
Client
A client is a device use only to request services
from a network service provider
ServerServer
Provides services to service requestors
Peer
Both request and provide network services

4. Communication between
Computers
Connectionless Communication
Do not guarantee delivery
Faster compared to connection-oriented
Example: ordinary postal serviceExample: ordinary postal service
IP, UDP, IPX
Connection-Oriented Communication
Guarantee delivery
Slower compared to connectionless
Example: Registered Courier
TCP, SPX, X.25

5. SLIP and PPP
SLIP: Serial Line Internet Protocol
Used to transmit IP packet over serial lines and
telephone connections
As part of dial-up connectionAs 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

6. 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