CCNA Cisco router to configure a DHCP Overview Part 1

RFC 2131, DHCP provides IP address and other parameters to IP hosts.

DHCP is a client / server installation configuration of the client, where the network addresses and other parameters are dynamically configured hosts.

DHCP supports three mechanisms for IP address assignment:

Or static / automatic assignment - server rent a fixed IP address to a DHCP client.

O Server dynamically allocates an IP address lease to a client for a limited period ofTime or until the DHCP client reports the IP address

Subject / manual-assignment Here is the network administrator manually reserves and an IP address on a client and the server provides the address assigned to the DHCP client.

As a CCNA student want you to know, how to configure all options

DHCP message format new Bootstrap Protocol (BOOTP) message. This format provides support for BOOTP Relay AgentFunctionality and interoperability between BOOTP clients and DHCP servers.

We use relay agents to remove a single server setup on each subnet / VLAN or physical network segment.

default router with the Cisco IOS software include Cisco DHCP server and relay agent software.

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DHCP Server Overview

Cisco IOS developed for its implementation by a full server that assigns and manages IP addresses areadministratively specified address pool configured on the client router, DHCP.

Although Cisco can not assign IP addresses to a client, network administrator can be configured to forward the request to one or more DHCP servers configured manually again.

The four basic steps that occur when a client an IP address from the DHCP server.

A. The client sends a DHCPDISCOVER broadcast message to find a Server.

B. A DHCP server offers configuration parameters (such as an IP address, MAC address, domain name and a lease for the IP address) to the client in a DHCPOFFER unicast message.

C. A DHCP client to DHCP server IP host information offered by many. The client was unable to accept any of these offers, but will take the very first offer it receives.

Note: All quotes from the DHCP server is not guaranteed until a DHCP> Address Client had a chance to make a formal request, but the server usually reserves the address until the client's request

D. The DHCP client then a formal request to the server's IP address provided in a DHCPREQUEST message.

E. In return, the server will confirm that the IP address was assigned to the client by returning a DHCPACK unicast message to the client. The reason for the requestprovided an IP address (the DHCPREQUEST message), the client's DHCP broadcast will be issued as a broadcast so that any DHCP server, the client may receive the DHCPDISCOVER broadcast message from the first can now retrieve the IP address that was provided to them; the DHCP client.

In the event that the configuration parameters that were initially offered unicast message, the DHCP server to the client in the DHCPOFFER are illegal, saymisconfiguration error, the DHCP client is a broadcast message to the server DHCPDECLINE.

When the server receives the message will be sent denial DHCPDECLINE DHCPNAK then ask the DHCP client, the configuration parameters offered initially are not assigned. In case an error occurs during the negotiations on IP configuration parameters or the DHCP client has been slow to respond to the DHCPOFFERThe DHCP server to assign parameters to the server to another DHCP client from the DHCP.

As a student, CCNA know you will understand all the options

Because the router has a DHCP server?

or savings Trackable

the use of the DHCP client on the outside of each remote site router cut through the web. Static IP addresses are expensive to buy that must be acquired dynamically using the addresses

customers or lessConfiguration and centralized management

DHCP is very easy to install on client

Because the configuration of DHCP server supports all clients of all sbnets multiple subnets, you only need to manage change in a central server, if you need parameters for configuration.

Before you start configuring the server functions of the Cisco router, the following steps to complete '

1. Determine what subnets and IPAddress that is assigned to the setup on the server for the IP addresses along with not be accepted.

2. Default Router

3. Domain Name System (DNS)

4. Decide on a DNS domain name.

As a CCNA student want you to know, how to configure all options

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