Cisco 1700 Series Specifications download pdf (Page 227)

A-11

Cisco 1700 Series Router Software Configuration Guide

78-5407-03

Chapter A Networking Concepts

Dynamic Host Configuration Protocol

all external communications. In this type of configuration, relatively few external

addresses are required to support many internal hosts, thus conserving IP

addresses.

Because the addressing scheme on the inside network may conflict with registered

addresses already assigned within the Internet, NAT can support a separate

address pool for overlapping networks and translate the addresses as appropriate.

Dynamic Host Configuration Protocol

Dynamic Host Configuration Protocol (DHCP) is a client-server protocol that

enables devices on an IP network (the DHCP clients) to request configuration

information from a DHCP server. DHCP allocates network addresses from a

central pool on an as-needed basis. DHCP is useful for assigning IP addresses to

hosts connected to the network temporarily or for sharing a limited pool of IP

addresses among a group of hosts that do not need permanent IP addresses.

DHCP frees you from having to manually assign an IP address to each client.

DHCP configures the router to forward User Datagram Protocol (UDP)

broadcasts, including IP address requests, from DHCP clients. DHCP allows for

increased automation and fewer network administration problems by

• Eliminating the need for the manual configuration of individual computers,

printers, and shared file systems

• Preventing the simultaneous use of the same IP address by two clients

• Allowing configuration from a central site

Virtual LANs

A virtual LAN (VLAN) is a switched network that is logically segmented on an

organizational basis, by functions, project teams, or applications, rather than on a

physical or geographical basis. For example, all workstations and servers used by

a particular workgroup team can be connected to the same VLAN, regardless of

their physical connections to the network or the fact that they might be

intermingled with other workgroup teams. Reconfiguration of the network can be

done by means of software rather than by physically unplugging and moving

devices or wires.

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Cisco 1700 Series Specifications Page 227