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BOOTP
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 won’t 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.
 WINS & DHCP
NETBIOS over TCP/IP uses WINS.
A DHCP server must have a static address.
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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.
Dynamic Host Addresses
One downside to dynamic host addresses is that users expect web sites to be at static addresses, rather than at addresses that change every time the web server is rebooted. For this reason, web servers (and other servers offering services to the Internet population at large) are often given static addresses. |
Oh, so you’re on your ISP’s
network and you can’t 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 they’re beyond the scope of Network+.
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