BOOTP (Boot Protocol) is an older method for obtaining an IP address. Only one DHCP server is required even if the network has separate physical subnets as long as the routers connecting those separate networks or subnets have BOOTP compatibility. BOOTP is not as flexible as DHCP. Its limitations, along with Microsoft throwing its weight behind DHCP rather than BOOTP, have relegated BOOTP to the background.
If there is no DHCP or BOOTP server on the local network, and there is a non-BOOTP-compatible router between the client and the nearest DHCP server, then the client wont be able to retrieve its configuration information. This means that the client may be unable to do one or more of the following: access other computers on the same subnet via name or IP address, access hosts on the Internet by name or IP address, access hosts on other subnets by name or IP address.
Since the IP address is loaned, it is not a permanent deal. The IP number is released upon shutting down the client computer, or if it is unused, when the lease expires. Leases automatically renew if the client has been connected and actually using the loaned IP number. Typical lease renewals start at halfway through the lease period.
Oh, so youre on your ISPs network and you cant get a static address? There are ways around this, which involve updating a record listing your host name and its current IP address, so that others can find you no matter what IP address you are handed, but theyre beyond the scope of Network+.
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Version 1.0 - Version Date: November 7, 2004
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