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CCNA Cisco Certified Network Associate Study Guide - FTP Server

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688 Glossary<br />

MAC Media Access Control: The lower sublayer in the Data Link layer, it<br />

is responsible for hardware addressing, media access, and error detection of<br />

frames. See also: Data Link layer and LLC.<br />

MAC address A Data-Link layer hardware address that every port or<br />

device needs in order to connect to a LAN segment. These addresses are used<br />

by various devices in the network for accurate location of logical addresses.<br />

MAC addresses are defined by the IEEE standard and their length is six characters,<br />

typically using the burned-in address (BIA) of the local LAN interface.<br />

Variously called hardware address, physical address, burned-in<br />

address, or MAC-layer address.<br />

MacIP In AppleTalk, the <strong>Network</strong> layer protocol encapsulating IP packets<br />

in Datagram Delivery Protocol (DDP) packets. MacIP also supplies substitute<br />

ARP services.<br />

MAN Metropolitan-Area <strong>Network</strong>: Any network that encompasses a metropolitan<br />

area; that is, an area typically larger than a LAN but smaller than<br />

a WAN. See also: LAN.<br />

Manchester encoding A method for digital coding in which a mid-bit–<br />

time transition is employed for clocking, and a 1 (one) is denoted by a high<br />

voltage level during the first half of the bit time. This scheme is used by<br />

Ethernet and IEEE 802.3.<br />

maximum burst Specified in bytes or cells, the largest burst of information<br />

exceeding the insured rate that will be permitted on an ATM permanent<br />

virtual connection for a short time and will not be dropped even if it goes<br />

over the specified maximum rate. Compare with: insured burst. See also:<br />

maximum rate.<br />

maximum rate The maximum permitted data throughput on a particular<br />

virtual circuit, equal to the total of insured and uninsured traffic from the<br />

traffic source. Should traffic congestion occur, uninsured information may<br />

be deleted from the path. Measured in bits or cells per second, the maximum<br />

rate represents the highest throughput of data the virtual circuit is ever able<br />

to deliver and cannot exceed the media rate. Compare with: excess rate. See<br />

also: maximum burst.<br />

MBS Maximum Burst Size: In an ATM signaling message, this metric,<br />

coded as a number of cells, is used to convey the burst tolerance.

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