Siemens EF 711 Series Betriebsanweisung PDF herunterladen (Seite 476)

Glossary

SCALANCE WLC711

A-6 C79000-G8976-C260-03, 07/2012, User Guide, V8.11

IP Internet Protocol is the method or protocol by which data is sent from one computer to

another on the Internet. Each computer (host) on the Internet has at least one IP address

that uniquely identifies it. Internet Protocol specifies the format of packets, also called

datagrams, and the addressing scheme. Most networks combine IP with a higher-level

protocol called Transmission Control Protocol (TCP), which establishes a virtual connection

between a destination and a source.

IPC Interprocess Communication. A capability supported by some operating systems that allows

one process to communicate with another process. The processes can be running on the

same computer or on different computers connected through a network.

IPsec

IPsec-ESP

IPsec-AH

Internet Protocol security (IPSec)

Internet Protocol security Encapsulating Security Payload (IPsec-ESP). The encapsulating

security payload (ESP) encapsulates its data, enabling it to protect data that follows in the

datagram.Internet Protocol security Authentication Header (IPsec-AH). AH protects the

parts of the IP datagram that can be predicted by the sender as it will be received by the

receiver.IPsec is a set of protocols developed by the IETF to support secure exchange of

packets at the IP layer. IPsec has been deployed widely to implement Virtual Private

Networks (VPNs). IPsec supports two encryption modes: Transport and Tunnel. Transport

mode encrypts only the data portion (payload) of each packet, but leaves the header

untouched. The more secure Tunnel mode encrypts both the header and the payload. On

the receiving side, an IPSec-compliant device decrypts each packet. For IPsec to work, the

sending and receiving devices must share a public key. This is accomplished through a

protocol known as Internet Security Association and Key Management Protocol/Oakley

(ISAKMP/Oakley), which allows the receiver to obtain a public key and authenticate the

sender using digital certificates.

isochronous Isochronous data is data (such as voice or video) that requires a constant transmission rate,

where data must be delivered within certain time constraints. For example, multimedia

streams require an isochronous transport mechanism to ensure that data is delivered as fast

as it is displayed and to ensure that the audio is synchronized with the video. Compare:

asynchronous processes in which data streams can be broken by random intervals, and

synchronous processes, in which data streams can be delivered only at specific intervals.

ISP Internet Service Provider.

IV IV (Initialization Vector), part of the standard WEP encryption mechanism that concatenates

a shared secret key with a randomly generated 24-bit initialization vector. WPA with TKIP

uses 48-bit IVs, an enhancement that significantly increases the difficulty in cracking the

encryption. (See WPA and TKIP)

LAN Local Area Network.

LSA Link State Advertisements received by the currently running OSPF process. The LSAs

describe the local state of a router or network, including the state of the router's interfaces

and adjacencies. See also OSPF.

MAC Media Access Control layer. One of two sublayers that make up the Data Link Layer of the

OSI model. The MAC layer is responsible for moving data packets to and from one Network

Interface Card (NIC) to another across a shared channel.

MAC address Media Access Control address. A hardware address that uniquely identifies each node of a

network.

Table A-1 Networking Terms and Abbreviations (continued)

Term Explanation

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