M


MAC (Media Access Control) address

A six-octet number, described in hexadecimal, that uniquely identifies a host on a network. It is a unique number that is burned into the network interface.



MAC layer

In the OSI model, the lower of the two sublayers of the data-link layer. It is defined by the IEEE as being responsible for interaction with the physical layer.



Mac OS X

Version 10 of an operating system designed for Macintosh computer systems. Mac OS X represents a complete shift in Apple operating systems, as it is based on UNIX code and, as such, can be managed using UNIX utilities and procedures.



MAN (metropolitan area network)

A network that spans a defined geographical location such as a city or suburb.



master name server

The supplying name server that has authority in a DNS zone.



MAU (media access unit)

A transceiver that is specified in IEEE 802.3. Not to be confused with a Token Ring multistation access unit, which is abbreviated MSAU.



Mb (megabit)

1 million bits. Used to rate transmission transfer speeds.



MB (megabyte)

1 million bytes. Usually refers to file size.



Mbps (megabits per second)

The number of millions of bits that can travel across a given medium in a second.



MDI (medium-dependent interface)

A type of port found on Ethernet networking devices such as hubs and switches in which the wiring is straight through. MDI ports are sometimes referred to as uplink ports and are intended for use as connectivity points to other hubs and switches.



MDI-X (medium-dependent interface crossed)

A type of port found on Ethernet networking devices in which the wiring is crossed so that the transmit line of one device becomes the receive line of the other. MDI-X is used to connect hubs and switches to client computers.



memory address

The label assigned to define the location in memory where information is stored.



metric

A value that can be assigned to a route to encourage or discourage the use of the route.

See also [cost]


MIB (Management Information Base)

A data set that defines the criteria that can be retrieved and set on a device using SNMP.



microsegmentation

The process of using switches to divide a network into smaller segments.



microwaves

A wireless technology sometimes used to transmit data between buildings and across vast distances.



mirroring

A fault-tolerant technique in which an exact duplicate of data on one volume is created on another. Mirroring is defined as RAID 1.

See also [RAID]


modem (modulator-demodulator)

A device used to modulate and demodulate the signals that pass through it. It converts the direct current pulses of the serial digital code from the controller into the analog signals that are compatible with the telephone network.



MSAU (multistation access unit)

A device that is used in an IBM Token Ring network. It organizes the connected nodes into an internal ring and uses the RI and RO connectors to expand to other MSAUs on the network. Sometimes referred to as MAU.



MTBF (mean time between failure)

The amount of time, normally expressed in hours, that represents the average amount of time a component will function before it fails.



MTRJ

Media connector used with fiber-optic cabling.



MTTF (mean time to fix)

The amount of time it normally takes to fix a problem or swap out a component.



multicast

A single-packet transmission from one sender to a specific group of destination nodes.



multihomed

A term used to refer to a device that has more than one network interface.



multiplatform

A term used to refer to a programming language, technology, application or protocol that runs on different types of CPUs or operating systems.



multiplexing

Multiplexing is a technique of combining multiple channels over a transmission path and then recovering or de-multiplexing the separate channels at the receiving end. Examples include FDM, TDM,CDM, and WDM.



multiprocessor

A term that refers to the use of multiple processors in a single system.



multitasking

The running of several programs simultaneously. In actuality, during multitasking the processor is sharing its time between the programs, and it only appears as if they are running concurrently.





    Network+ Exam Cram 2
    Network+ Exam Cram 2
    ISBN: 078974905X
    EAN: N/A
    Year: 2003
    Pages: 194

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