Avaya EE Networking Guide de l'utilisateur télécharger pdf (Page 170)

170 Glossary

Enterprise Edge Networking Operations Guide P0910464 Issue 01

DHCP The Dynamic Host Configuration Protocol (DHCP) is a protocol that

lets network administrators centrally manage and automate the

assignment of IP addresses in an organization's network. Using the

Internet's set of protocols (TCP/IP), each machine that can connect to

the Internet needs a unique IP address. When an organization sets up

its computer users with a connection to the Internet, an IP address

must be assigned to each machine.

Without DHCP, the IP address must be entered manually at each

computer and, if computers move to another location in another part

of the network, a new IP address must be entered. DHCP lets a

network administrator supervise and distribute IP addresses from a

central point and automatically sends a new IP address when a

computer is plugged into a different place in the network.

DiffServ Differentiated Services (DiffServ) is a implementation methodology

for QoS service for IP networks. DiffServ is a rule based methodology

intended to improve network performance. Instead of applying faster,

more advanced technology, networks are managed by appropriate

network policies. For DiffServ, there is a cost associated with higher

quality services and a risk with lower quality services.

DLCI The data link connection indentifier (DLCI) is used to identify a PVC

in frame relay networks.

DNS The domain name system or domain name server (DNS) is the system

in the Internet that maps names of objects (most usually host names)

into IP numbers or other resource record values. The namespace of

the Internet is divided into domains, and the responsibility for

managing names within each domain is delegated, typically to

systems within each domain.

domain name The domain name is used to organize Internet names into manageable

groups, such as nortelnetworks.com.

Ethernet Ethernet is a widely used LAN technology defined by the Ethernet

and IEEE 802.3 specification for data transmission.

filtering Filtering is the process of examining a data packet on the network to

determine the destination of the data and to decide whether the packet

should be passed along on the local LAN, copied to another LAN, or

dropped.

frame A frame is a unit of data transmission in a local area network.

frame relay A frame relay is a high-speed, packet switching WAN protocol

designed to provide efficient, high-speed frame or packet

transmission with minimum delay. Frame relay uses minimal error

detection and relies on higher level protocols for error control.

FTP The file transfer protocol (FTP) allows a user on one host to access

and transfer files to and from another host over a network. On the

Internet, FTP refers to a tool for accessing linked files.

H.323 H.323 is the standard for sending voice (audio) and video using IP on

the public Internet and within intranets.

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