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Glossary 171

P0910464 Issue 01 Enterprise Edge Networking Operations Guide

HDLC High-level Data Link Control (HDLC) is a group of protocols or rules

for transmitting data between network points or nodes. In HDLC, data

is organized into a unit (called a frame) and sent across a network to a

destination that verifies its successful arrival. The HDLC protocol

also manages the flow or pacing at which data is sent. HDLC is one of

the most commonly-used protocols in what is Layer 2 of the industry

communication reference model called Open Systems Interconnection

(OSI).

host name The host name is a readable name that uniquely identifies a device on

the Internet and is associated with a corresponding IP address.

HTTP The Hypertext Transfer Protocol (HTTP) is the set of rules for

exchanging files (text, graphic images, sound, video, and other

multimedia files) on the world wide web.

ICMP ICMP is a message control and error-reporting protocol between a

host server and a gateway to the Internet. ICMP uses IP datagrams,

but the messages are processed by the TCP/IP software and are not

directly apparent to the application user.

IETF The Internet Engineering Task Force (IETF) is the committee that

defines standard Internet operating protocols such as TCP/IP. The

IETF is supervised by the Internet Society's Internet Architecture

Board (IAB).

In-Band In-band is a method of device access utilizing a network interface

component within the device.

Internet-standard

Network Management

Framework

Device configuration and monitoring via SNMP.

IP The Internet Protocol (IP) is the protocol that supports data being sent

from one computer to another on the Internet. Each computer on the

Internet has at least one address that uniquely identifies it from all

other computers on the Internet. When you send or receive data (for

example, an e-mail note or a Web page), the message gets divided

into units called packets. Each of these packets contains both the

sender's Internet address and the receiver's address.

IP is a connectionless protocol, which means that there is no

established connection between the end points that are

communicating. Each packet that travels through the Internet is

treated as an independent unit of data without any relation to any

other unit of data. (The reason the packets do get put in the right order

is because of TCP, the connection-oriented protocol that keeps track

of the packet sequence in a message.) In the Open Systems

Interconnection (OSI) communication model, IP is in layer 3, the

Networking Layer.

IP address The Internet Protocol address is a unique identifier that allows

communication over the Internet to be directed to the appropriate

destination. Every computer on the Internet must have a unique IP

address. IP addresses are allocated by an ISP in following format:

nnn.nnn.nnn.nnn, where nnn is a numeric value from 0 to 255. IP

addressing might be referred to as being static (fixed) or dynamic.

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