Glossary – Cisco 32369 User Manual

Page 52

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Release 12.0(1)T


address binding—A mapping between the client’s IP and hardware (MAC) addresses. The client’s
IP address may be configured by the administrator (manual address allocation) or assigned from a
pool by the DHCP server (automatic address allocation). The binding also contains a lease expiration
date. The default for the lease expiration date is one day.

address conflict—A duplication of use of the same IP address by two hosts. During address
assignment, DHCP checks for conflicts using ping and gratuitous ARP. If a conflict is detected, the
address is removed from the pool. The address will not be assigned until the administrator resolves
the conflict.

address pool—The range of IP addresses assigned by the DHCP server. Address pools are indexed
by subnet number.

client—Any host requesting configuration parameters.

database—A collection of address pools and bindings.

database agent—Any host storing the DHCP bindings database, for example, a Trivial File Transfer
Protocol (TFTP) server.

DNS—Domain Name System. A system used in the Internet for translating names of network nodes
into addresses.

automatic address allocation—An address assignment method where a network administrator
obtains an IP address for a client for a finite period of time or until the client explicitly relinquishes
the address. Automatic allocation is particularly useful for assigning an address to a client that will
be connected to the network only temporarily or for sharing a limited pool of IP addresses among a
group of clients that do not need permanent IP addresses. Automatic allocation may also be a good
choice for assigning an IP address to a new client being permanently connected to a network where
IP addresses are sufficiently scarce that it is important to reclaim them when old clients are retired.

Dynamic Host Configuration Protocol (DHCP)—A protocol that provides a mechanism for
allocating IP addresses dynamically so that addresses can be reused when hosts no longer need them.

manual address allocation—An address assignment method that allocates an administratively
assigned IP address to a host. Manual allocation allows DHCP to be used to eliminate the error-prone
process of manually configuring hosts with IP addresses.

server—Any host providing configuration parameters.