Dell PowerConnect W Clearpass 100 Software Betriebsanweisung PDF herunterladen (Seite 294)

0511296-01 | April2013 294

Term Definition

band A specified range of frequencies of electromagnetic radiation.

Daylight Saving Time Daylight saving time (DST), also known as summer time, is the practice of

advancing clocks, so that evenings have more daylight and mornings

have less. Typically clocks are adjusted forward one hour near the start of

spring and are adjusted backward in autumn.

DHCP The Dynamic Host Configuration Protocol (DHCP) is an auto-configuration

protocol used on IP networks. Computers or any network peripherals that

are connected to IP networks must be configured, before they can

communicate with other computers on the network. DHCP allows a

computer to be configured automatically, eliminating the need for a

network administrator. DHCP also provides a central database to keep a

track of computers connected to the network. This database helps in

preventing any two computers from being configured with the same IP

address.

DNS Server A DNS server functions as a phonebook for the Internet and Internet users.

It converts human readable computer hostnames into IP addresses and

vice-versa.

A DNS server stores several records for a domain name such as an

address 'A' record, name server (NS), and mail exchanger (MX) records.

The Address 'A' record is the most important record that is stored in a DNS

server, because it provides the required IP address for a network

peripheral or element.

Extensible Authentication

Protocol (EAP)

Authentication protocol for wireless networks that expands on methods

used by the point-to-point protocol (PPP), a protocol often used when

connecting a computer to the Internet. EAP can support multiple

authentication mechanisms, such as token cards, smart cards, certificates,

one-time passwords, and public key encryption authentication.

fixed wireless Wireless devices or systems in fixed locations such as homes and offices.

Fixed wireless devices usually derive their electrical power from the utility

mains, unlike mobile wireless or portable wireless which tend to be

battery-powered. Although mobile and portable systems can be used in

fixed locations, efficiency and bandwidth are compromised compared with

fixed systems.

frequency allocation Use of radio frequency spectrum regulated by governments.

frequency spectrum Part of the electromagnetic spectrum.

hotspot A WLAN node that provides Internet connection and virtual private

network (VPN) access from a given location. A business traveller, for

example, with a laptop equipped for Wi-Fi can look up a local hot spot,

contact it, and get connected through its network to reach the Internet and

their own company remotely with a secure connection. Increasingly, public

places, such as airports, hotels, and coffee shops are providing free

wireless access for customers.

IEEE 802.11 standards The IEEE 802.11 is a set of standards that are categorized based on the

radio wave frequency and the data transfer rate.

POE PoE is a method of delivering power on the same physical Ethernet wire

used for data communication. Power for devices is provided in one of the

following two ways:

l Endspan— The switch that an AP is connected for power supply.

Table 56:

List of Terms

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