Netgear ProSafe FVS124G User Manual download pdf (Page 233)

Reference Manual for the ProSafe VPN Firewall 25 with 4 Gigabit LAN and Dual WAN Ports

Glossary -7

202-10085-01, March 2005

Local Area Network

A communications network serving users within a limited area, such as one floor of a building. A LAN

typically connects multiple personal computers and shared network devices such as storage and printers.

Although many technologies exist to implement a LAN, Ethernet is the most common for connecting

personal computers and is limited to a distance of 1,500 feet. LANs can be connected together, but if

modems and telephones connect two or more LANs, the larger network constitutes what is called a WAN or

Wide Area Network.

MAC

(1) Medium Access Control. In LANs, the sublayer of the data link control layer that supports

medium-dependent functions and uses the services of the physical layer to provide services to the logical

link control (LLC) sublayer. The MAC sublayer includes the method of determining when a device has

access to the transmission medium. (2) Message Authentication Code. In computer security, a value that is a

part of a message or accompanies a message and is used to determine that the contents, origin, author, or

other attributes of all or part of the message are as they appear to be. (

IBM Glossary of Computing Terms)

MAC address

The Media Access Control address is a unique 48-bit hardware address assigned to every network interface

card. Usually written in the form 01:23:45:67:89:ab.

Maximum Receive Unit

The size in bytes of the largest packet that can be sent or received.

Maximum Transmit Unit

The size in bytes of the largest packet that can be sent or received.

Mbps

Megabits per second.

MDI/MDIX

In cable wiring, the concept of transmit and receive are from the perspective of the PC, which is wired as a

Media Dependant Interface (MDI). In MDI wiring, a PC transmits on pins 1 and 2. At the hub, switch,

router, or access point, the perspective is reversed, and the hub receives on pins 1 and 2. This wiring is

referred to as Media Dependant Interface - Crossover (MDI-X).

MTU

The size in bytes of the largest packet that can be sent or received.

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Netgear ProSafe FVS124G User Manual Page 233