This is the complete DHCP configuration guide on Windows server and Cisco router. The article is based on a step by step guide which helps you configure the DHCP server on Windows Server and Cisco routers easily.

Dynamic Host Configuration Protocol (DHCP) is a client/server protocol that automatically provides an Internet Protocol (IP) host with its IP address and other related configuration information such as the subnet mask and default gateway. RFCs 2131 and 2132 define DHCP as an Internet Engineering Task Force (IETF) standard based on Bootstrap Protocol (BOOTP), a protocol with which DHCP shares many implementation details. DHCP allows hosts to obtain required TCP/IP configuration information from a DHCP server.

Why we use DHCP in the network? Every device on a TCP/IP-based network must have a unique unicast IP address to access the network and its resources. Without DHCP, IP addresses for new computers or computers that are moved from one subnet to another must be configured manually; IP addresses for computers that are removed from the network must be manually reclaimed. With DHCP, this entire process is automated and managed centrally. The DHCP server maintains a pool of IP addresses and leases an address to any DHCP-enabled client when it starts up on the network. Because the IP addresses are dynamic (leased) rather than static (permanently assigned), addresses no longer in use are automatically returned to the pool for reallocation.

Benefits of DHCP Server.

Reliable IP address configuration. DHCP minimizes configuration errors caused by manual IP address configuration, such as typographical errors, or address conflicts caused by the assignment of an IP address to more than one computer at the same time.

Reduced network administration. DHCP includes the following features to reduce network administration:

• Centralized and automated TCP/IP configuration.
• The ability to define TCP/IP configurations from a central location.
• The ability to assign a full range of additional TCP/IP configuration values by means of DHCP options.
• The efficient handling of IP address changes for clients that must be updated frequently, such as those for portable computers that move to different locations on a wireless network.
• The forwarding of initial DHCP messages by using a DHCP relay agent, which eliminates the need for a DHCP server on every subnet.

DHCP Configuration Guide

• To configure DHCP server on Windows Server 2012 R2 read this article:

Install and Configure DHCP Server on Windows Server 2012 R2

• The step by step DHCP configuration guide on Cisco Router read this article:

How to Configure DHCP on Cisco Router?

• To Configure DHCP server on Windows Server 2016 follows the below step by step guide DHCP configuration video guide.

That’s all a system administrator needs to know about DHCP configuration on Cisco routers and Windows servers. For more information about the dynamic host configuration protocol read some book about DHCP and ask your question through the comment section.

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For GNS3 Configuration in previews topic “Install GNS3 1.1 Network Simulator Step by Step” I explained the installation of GNS3. Now I’m going to show you the essential GNS3 Configuration for Cisco training lab. It’s the exact Simulator which we can create a complete practical Lab for CCNA, CCNP and CCIE Certifications. By default there is no Router in GNS3, you must download Router IOS Image and add it to GNS3.

GNS3 Configuration for Beginners

So let’s start it. First run the installed GNS3, when it is opened, ask you to create a new project. Only type the name of new project and select the file location if you want to keep it in different location and click OK.

Now to add a router, click Edit form Menu then click Preference, in Preference page click on Dynamips twice and click IOS Routers, then click New button and browse for IOS Image and select IOS image, open it.

Click Yes when ask you would you like to decompress this IOS image?

When the decompressing is finished click next.

Click next and let the router named by default.

Now select memory for router and click next. Default is good but no enough RAM will prevent IOS to start.

Leave the network adapter slot by default for now and click next.

On the Idl-PC click finish.

Now you have add a router successfully.

For a complex network lab you must add some more router IOS and Firewall.

Router IOS is not provided freely by GNS3 Network Simulator, but  you must purchase or use your existing router IOS for GNS3 configuration and router configuration. Goolge can help you find some free router IOS.

OK, now you must understand the essential gns3 configuration for stating networking field and achieve your Network Certifications or Security Certifications.

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