The Importance of MCITP 2008 To Improve Your IT Career
When the client computer starts up, it sends a broadcast DHCPDISCOVER message, requesting a DHCP server. The request includes the hardware address of the client computer.
Any DHCP server receiving the broadcast that has available IP addresses will send mcsa certification a DHCPOFFER message to the client. This message offers an IP address for a set period of time (called a lease ), a subnet mask, and a server identifier (the IP address of the DHCP server). The address that is offered by the server is marked as unavailable and will not be offered to any other clients during the DHCP negotiation period.
The client selects one of the offers and broadcasts a DHCPREQUEST message, indicating its selection. This allows any DHCP offers that were not accepted to be returned to the pool of available IP addresses.
The DHCP server that was selected sends back a DHCPACK message as an acknowledg- ment, indicating the IP address, subnet mask, and duration of the lease that the client com- puter will use. It may also send additional configuration information, such as the address of the default gateway and the DNS server address.
If you want to use DHCP and there is no DHCP server on your network seg- ment, you can use a DHCP server on another network segment—provided that the DHCP server is configured to support your network segment and that a DHCP Relay Agent has been installed on your network router.
If you are not able to access a DHCP server installed on a Windows 2000 Server or Windows Server 2003 within Active Directory, make sure that the DHCP server has been authorized.
Domain Name System (DNS) servers are used to resolve hostnames to IP addresses. This makes it easier for people to access domain hosts. For example, do you know what the IP address is for the White House? No? Do you know the domain hostname of the White House? You probably mcitp server administrator guessed that it’s www.whitehouse.gov . You can understand why many people might not know the IP address but would know the domain hostname.
When you access the Internet and type in www.whitehouse.gov , there are DNS servers within the infrastructure of the Internet that resolve the hostname to the proper IP address. If you do not have access to a properly configured DNS server, you can configure a HOSTS file for your computer that contains the mappings of IP addresses to the domain hosts that you need to access.
If you can access a computer by IP address but not by name, you’ve probably got a DNS resolution problem.
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