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On a local area network (LAN) or other network, the MAC address is a computer's unique

hardware number. (On an Ethernet LAN, it's the same as your Ethernet address). The MAC layer

frames data for transmission over the network, then passes the frame to the physical layer interface

where it is transmitted as a stream of bits.

Media Access Control filtering filters incoming frames based on MAC (Media Access Control)

address(es) that you specify.

Main mode is an IPSec phase 1 negotiation mode (see Negotiation Mode). Main mode ensures the

highest level of security when the communicating parties are negotiating authentication (phase 1).

See also Aggressive Mode.

Management VLAN ID is the VLAN ID of the CPU and is used for management only.

To access the switch make sure the port that you are connected to is a member of Management VLAN.

In STP, this is the maximum time (in seconds) a device waits without receiving a BPDU before

attempting to reconfigure. STP-aware devices exchange Bridge Protocol Data Units (BPDUs)

periodically. When the bridged LAN topology changes, a new spanning tree is constructed.

Message Digest 5, HMAC-MD5 (RFC 2403) is a hash algorithm that is used to authenticate

packet data. It produces a 128-bit message digest. See also Hash and SHA1.

A MD5 fingerprint is a certificate's message digest that was calculated using the MD5 algorithm.

See also message digest.

MDI (Medium Dependent Interface)/MDIX (MDI crossover) is a type of Ethernet port.

MDI ports connect to MDIX ports using straight-through Ethernet cables; both MDI-to-MDI and

MDIX-to-MDIX connections use crossover Ethernet cables.

A message digest is the encrypted output that is the result when a hash function is performed on a plain-text message.

This fixed-length set of bits functions as a digital signature of the original message. See also Hash.

A message digest is the fixed-length encrypted output that is the result of applying a hash to plain text input.

The message digest functions as a digital fingerprint of the original message. A message digest provides

a way to check the integrity of a message. If someone changes the original message, it produces

a different message digest.

Message waiting notifies you when a voice message arrives. The details of the message waiting feature

depend on your telephone and your voice mail service.

A metering pulse is a periodic signal that the telephone company's switch sends to a telephone during

a call in order to measure the length of the call for billing purposes.

A Management Information Base (MIB) is a collection of managed objects.

The managed devices contain object variables/managed objects that define each piece

of information to be collected about a device. Examples of variables include such as the number

of packets received, node port status and so on.

Message Integrity Check (MIC, also named Michael) is a function designed to detect if someone

has covertly altered data packets. The receiver and the transmitter each compute and compare the MIC.

If they do not match, it is assumed that the data has been tampered with and the packet is dropped.

This is a port that copies the network traffic of another port for the purpose of analyzing the

network traffic. This is also known as the sniffer port or the analysis port.

This is a port whose traffic is duplicated and analyzed by a sniffer port. This is also known as the source port.

Minimum Square Error (MSE) is the minimum mean-square error (also known as MMSE) performance

measure is a popular metric for optimal signal processing.

Buildings such as hotels, motels, resorts, residential multi-dwelling units, office buildings, university campuses, etc.

Mu-Law and A-Law are Pulse Code Modulation (PCM) techniques that dictate forms of compression

for audio signals. They are widely-used standard methods of coding voice as they improve the

signal-to-noise ratio without increasing the amount of data. Mu-Law is a standard in

North America; A-Law in Europe.

Multiple ESS is a function that allows multiple ESSs to be configured on just one access point.

Wireless stations can use different ESSIDs to associate with the same AP. Only wireless stations

with the same ESSID can communicate with each other. This allows the AP to logically group

wireless stations in a manner similar to VLAN (Virtual LAN).

Deliver IP packets to a specific group of hosts using IP multicast. IGMP (Internet Group Management Protocol)

is the protocol used to support multicast groups.

A method that combines information from multiple connections into one connection for transfer

over an ATM circuit.

Multiplexors or MUXs, as they are often called, are devices that combine signals from various

sources such as PBX (Private Branch Exchange), asynchronous terminals or a bridge connected to

a WAN. A multiplexor transmits these signals as a single data stream over a digital line.

Multiplexors conserve bandwidth.