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Showing posts from August, 2006

Network Address Translation( NAT)

Network Address Translation (NAT) allows you to convert one IP address in to another address. Address Translation process changes the IP address information in a packet to different address. NAT feature is introduced to solve two major issues faced in networking: face the shortage of IP addresses and hide the network scheme. Now the major function of Address Translation is to convert the private IP addresses in a network in to a public IP address. This tutorial explains the major functions, different types and working of NAT.

Different Types of Address Translation
Address Translation is of different types depends on the way and the number of IP addresses they translate.
Static NAT

In Static Network Address Translation, one IP address in a packet is translated to different IP address manually. It is one to one mapping.

Dynamic NAT

In Dynamic Network Address Translation, address translation device picks an IP address dynamically to convert from a list of allowed IP addresses. Dynamic NAT…

Dynamic Host Configuration Protocol (DHCP) CCNA Exam Tutorial

The Dynamic Host Configuration Protocol (DHCP) allows devices to dynamically get IP address information. It is very important in networks especially for big networks because it assigns IP addresses to each devices in the network automatically. Think about a network having thousands of devices. It is very difficult to assign static IP addresses to each devices without having errors. Here Dynamic Host Configuration Protocol helps us. This protocol assigns IP address to each device without any errors and is very easy to manage. It contains two parts, server and client.

Working of Dynamic Host Configuration Protocol
We can simply use the term DORA to explain the working of DHCP. It is a four stage process and each stage is explained below.

D-- DHCP Discovery

When a client connected to a network, it sends broadcast to discover the DHCP server. This broadcast is termed as DHCPDISCOVER.

O--- DHCP Offer

At this stage, server responds to the client DISCOVERY message and sends a DHCPOFFER unicas…