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Appendix A
A-10
• LAN
A LAN (Local Area Network) is a local network which is usually set
up within a building. Here, all computers involved share local services
(e.g. DHCP or file server). With the help of a WLAN, a LAN may also
comprise and network several buildings.
• MAC address
The MAC (Media Access Control) address is the unambiguous hard-
ware address of a network interface. Each hardware manufacturer
assigns his proper MAC addresses from his own number pool. As a
result, manufacturers can be assigned on the MAC address level.
• NAT, Network Address Translation
Translation of an IP address in one network into another IP address
in another network. As a result, many computers in one network can
be displayed to the outside with a single IP address. NAT is often used
by SOHO routers or in ComPoint ACs if several clients are connected
via a switch.
• Network Mask
see subnet mask
• PCMCIA
The PCMCIA (Personal Computer Memory Card International
Association) is an industrial association founded in 1989 which pro-
duces and sells I/O cards with the size of credit cards, e.g. WLAN
cards.
• Ping
Ping means Packet INternet Grouper and is a tool which serves to
check whether a computer is online. Ping is used to search for errors
in a network (troubleshooting). The person who carries out the check
waits for replies of other computers.
• RJ-45
A plug-in connector as it is also used for ISDN telephones. It serves to
connect computers via Ethernet. In contrast to ISDN where only 4
pins are used, all 8 pins are used in the case of an Ethernet cable.
• Roaming
In WLANs with several cells, clients can move freely through the cells.
When doing so, they can log out at one access point and log on to
another without the user noticing it. This capacity is called roaming.
• SOHO
Small Office/Home Office
• Static IP Address
A permanently configured IP address, in contrast to dynamic IP
addresses.