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Glossary

SCALANCE WLC711

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

SSH Secure Shell, sometimes known as Secure Socket Shell, is a Unix-based command

interface and protocol for securely getting access to a remote computer. SSH is a suite of

three utilities - slogin, ssh, and scp - secure versions of the earlier UNIX utilities, rlogin, rsh,

and rcp. With SSH commands, both ends of the client/server connection are authenticated

using a digital certificate, and passwords are protected by being encrypted.

SSID Service Set Identifier. A 32-character unique identifier attached to the header of packets sent

over a Wireless LAN that acts as a password when a wireless device tries to connect to the

Basic Service Set (BSS). Several BSSs can be joined together to form one logical WLAN

segment, referred to as an extended service set (ESS). The SSID is used to identify the

ESS.

In 802.11 networks, each Access Point advertises its presence several times per second by

broadcasting beacon frames that carry the ESS name (SSID). Stations discover APs by

listening for beacons, or by sending probe frames to search for an AP with a desired SSID.

When the station locates an appropriately-named Access Point, it sends an associate

request frame containing the desired SSID. The AP replies with an associate response

frame, also containing the SSID.

Some APs can be configured to send a zero-length broadcast SSID in beacon frames

instead of sending their actual SSID. The AP must return its actual SSID in the probe

response.

SSL Secure Sockets Layer. A protocol developed by Netscape for transmitting private documents

via the Internet. SSL works by using a public key to encrypt data that's transferred over the

SSL connection. URLs that require an SSL connection start with https: instead of http.

SSL uses a program layer located between the Internet's Hypertext Transfer Protocol

(HTTP) and Transport Control Protocol (TCP) layers. The ‘sockets’ part of the term refers to

the sockets method of passing data back and forth between a client and a server program in

a network or between program layers in the same computer. SSL uses the public-and-

private key encryption system from RSA, which also includes the use of a digital certificate.

SSL has recently been succeeded by Transport Layer Security (TLS), which is based on

SSL.

Subnet mask (See netmask)

Subnets Portions of networks that share the same common address format. A subnet in a TCP/IP

network uses the same first three sets of numbers (such as 198.63.45.xxx), leaving the

fourth set to identify devices on the subnet. A subnet can be used to increase the bandwidth

on the network by breaking the network up into segments.

SVP SpectraLink Voice Protocol, a protocol developed by SpectraLink to be implemented on

access points to facilitate voice prioritization over an 802.11 wireless LAN that will carry

voice packets from SpectraLink wireless telephones.

Switch In networks, a device that filters and forwards packets between LAN segments. Switches

operate at the data link layer (layer 2) and sometimes the network layer (layer 3) of the OSI

Reference Model and therefore support any packet protocol. LANs that use switches to join

segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet

LANs.

syslog A protocol used for the transmission of event notification messages across networks,

originally developed on the University of California Berkeley Software Distribution (BSD)

TCP/IP system implementations, and now embedded in many other operating systems and

networked devices. A device generates a messages, a relay receives and forwards the

messages, and a collector (a syslog server) receives the messages without relaying them.

Syslog uses the user datagram protocol (UDP) as its underlying transport layer mechanism.

The UDP port that has been assigned to syslog is 514. (RFC3164)

Table A-1 Networking Terms and Abbreviations (continued)

Term Explanation

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