Chapter 13 Network Servers

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Network Servers

Chapter 13


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Chapter Objectives

Describe Client-server and Peer to Peer network

model Explain E-mail server

Explain Domain Name System

Explain Dynamic Host Configuration Protocol Describe Windows Internet Name Service

State the features of Network Operating System


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Client-Server and Peer to Peer - I

ClientServer

Consist of one or more

clients and only one

server

It is not possible for

one client to access

shared resources on

another client system


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Client-Server and Peer to Peer - II

Peer to Peer

Computers on the

network can have

access to resources

and data. The

computers act as both

clients and servers

Computers are able to

communicate with

each other and share

data with other users


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Types of Servers

Servers are classified depending on the nature ofwork

Types:

File Server

Print Server

Mail Server

Database Server

FTP Server

DNS Server DHCP Server

WINS Server


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Sharing Resources on Network

Networking tasks includes sharing files and network

recourses and setting up network security

User can share:

Internet connection among multiple computers Several numbers of files, folders to avoid data

redundancy over Local Area Network


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E-Mail Server

Often referred as mail server

Receives and delivers e-mails over the network

Maintains a storage area for e-mails

Employs a set of user defined rules that determinethe strategy for mail server to respond according to

the destination of a specific message


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DNS Namespace

Categories of top-level domains: Organizational domain

Geographical domain

Reverse domain


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DNS Server

Contains information about the zones Zones are continuous portion of the domain name

system namespace


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Dynamic Host Configuration Protocol

(DHCP)

Provides dynamic configuration of IP addresses on

time lease basis

Backward compatible with BOOTP

DHCP Server employs manual, automatic and

dynamic IP address allocation methods

Reduces administration of a TCP/IP network


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DHCP Server Responsibilities

Address Storage and Management

Configuration Parameter Storage and Management

Lease Management

Responding To Client Requests

Providing Administration Services


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DHCP Client Responsibilities

Configuration Initiation

Configuration Parameter Management

Lease Management

Message Retransmission


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IP Address Allocation

DHCP provides temporary IP address with aparticular amount of time

Methods of allocating IP address to the hosts:

Manual allocationIP addresses are manuallyentered by server administrator

Automatic allocationAssigns the requesting clientan IP address from a pool of IP address

Dynamic allocationMakes use of IP address

request and permits process with time lease


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WINS - II

WINS Client Name Registration

In WINS database NetBIOS, the WINS-enabled

client registers the names of processes running

on it. These client names should be renewed in the

WINS database

WINS Client Name Renewal

The renewal interval determines how long the serverstores the name registration as an active record in the

WINS database


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WINSIII

WINS Client Name Release

NetBIOS names are released explicitly or silently

WINS Client Name Resolution

WINS server accepts clients name resolution request A system name and a share name needs to be

specified by the user in order to connect to a network

drive


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WINS - IV

WINS Client Behaviour

Basic functions that a WINS client includes;

Startup

Plugging to subnet Extended shutdowns

Establishing connections


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Troubleshooting WINS

Most WINS problems are not directly related to

WINS rather they are related to NetBIOS

Nbtstat is used to troubleshoot NetBIOS name

resolution problems NetBIOS over TCP/IP (NetBT) resolves NetBIOS

names to IP addresses


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NOS - I

Network Operating System An Operating System for computer that can be

connected in network

Organizes the activities of multiple computers

across a network

Windows NT (New Technology)

Contains advanced features for security, network

support, multitasking and user administration

Basically two products; Windows NT Workstation and

Windows NT Server


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NOS - II

Windows 2000 Improved version of Windows NT

No need to configure or use NetBIOS

Desktop and a server version of Windows 2000:

Windows 2000 Professional

Windows 2000 Server

Active directory - Centralized storage area of

information about network resources related to users,

applications, files and printers


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NOS - III

Windows 2003 Server .NET version of the Windows 2000 server operating

system

Windows Server 2003 editions: Small Business Server (Standard and Premium Edition)

Web Edition Standard Edition

Enterprise Edition

Datacenter Edition

Windows XP Professional Device support, user friendly and Remote Desktop Multiple users can log in and use the system without

logging out the previous users


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NOS - IV

Novell Netware

Novell Corporation is a local-area network (LAN)

operating system

Netware supported different types of LANtechnologies from Ethernet to IBMs token-ring

networks

Linux

An open source computer operating system Linux is based on UNIX operating system which was

designed to support networking


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Summary - I

In Client-Server model, server controls the network

In P2P network, all the PCs act as both clients and

servers

A Mail server is an application that receives e-mail from

local net users, remote users and delivers these e-mails

to the intended users

Name resolution is the process of mapping computer

names to their associated IP addresses and this service

is provided by DNS

Domain Name System (DNS) maps Fully Qualified

Domain Name (FQDN) to corresponding IP address


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Summary - II

DHCP protocol is an extension to the Bootstrap Protocol

(BOOTP) and used by the clients on the network to

obtain IP address automatically

DHCP provides temporary IP address with a particular

amount of lease time

Windows Internet Name Service maps Network Basic

Input/Output System (NetBIOS) computer names to

corresponding IP addresses

A network operating system (NOS) deals concurrentrequests from clients and provides the security

necessary in a multi-user environment

Chapter 13 Network Servers

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