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DHCP
DHCP (Dynamic Host Configuration
Protocol) loans (leases) a unique IP address
from an available pool, which is set at the server,
to a client machine for a period of time. Beyond IP addresses,
DHCP can assign DNS and WINS servers, as well as
routing information such as the default gateway and subnet
mask. DHCP is BOOTP compatible.
One thing to watch out for is that
you can set each adapter on your system (including both LAN adapters
and dial-up adapters used to contact your ISP) to get TCP/IP configuration
information from a central server on the network via DHCP.
It can happen that you are working
away busily on your LAN connection, then dial out to your ISP and find
that you can no longer access any LAN computers by name – this
might occur if when you dialed out, your dial-up networking connection
replaced your DNS server setting with one that points to an Internet-based
DNS server. If your internal LAN hosts are private and are not listed
in DNS on the Internet, these hosts would all of a sudden become unreachable.
One way to check if this is the problem you’re experiencing is
to disconnect from the dial-up connection, and then see if you regain
access to local computers by name.
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CertiGuide for Network+ (http://www.CertiGuide.com/netplus/) on CertiGuide.com
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