Cisco PIX 525 Spezifikationen PDF herunterladen (Seite 579)

Glossary

GL-11

Cisco Security Appliance Command Line Configuration Guide

OL-6721-01

mask

A 32-bit mask that shows how an Internet address is divided into network, subnet, and host parts. The

mask has ones in the bit positions to be used for the network and subnet parts, and zeros for the host

part. The mask should contain at least the standard network portion, and the subnet field should be

contiguous with the network portion.

MCR

See multicast.

MC router

Multicast (MC) routers route multicast data transmissions to the hosts on each LAN in an internetwork

that are registered to receive specific multimedia or other broadcasts. See also multicast.

MD5

Message Digest 5. A one-way hashing algorithm that produces a 128-bit hash. Both MD5 and SHA-1

are variations on MD4 and are designed to strengthen the security of the MD4 hashing algorithm.

SHA-1 is more secure than MD4 and MD5. Cisco uses hashes for authentication within the IPSec

framework. Also used for message authentication in SNMP v.2. MD5 verifies the integrity of the

communication, authenticates the origin, and checks for timeliness. MD5 has a smaller digest and is

considered to be slightly faster than SHA-1.

MDI

Media dependent interface.

MDIX

Media dependent interface crossover.

Message Digest

A message digest is created by a hash algorithm, such as MD5 or SHA-1, that is used for ensuring

message integrity.

MGCP

Media Gateway Control Protocol. Media Gateway Control Protocol is a protocol for the control of

VoIP calls by external call-control elements known as media gateway controllers or call agents. MGCP

merges the IPDC and SGCP protocols.

Mode

See Access Modes.

Mode Config

See IKE Mode Configuration.

Modular Policy

Framework

Modular Policy Framework. A means of configuring security appliance features in a manner to similar

to Cisco IOS software Modular QoS CLI.

mobile station. Refers generically to any mobile device, such as a mobile handset or computer, that is

used to access network services. GPRS networks support three classes of MS, which describe the type

of operation supported within the GPRS and the GSM mobile wireless networks. For example, a Class

A MS supports simultaneous operation of GPRS and GSM services.

MS-CHAP

Microsoft CHAP.

MTU

Maximum transmission unit, the maximum number of bytes in a packet that can flow efficiently across

the network with best response time. For Ethernet, the default MTU is 1500 bytes, but each network

can have different values, with serial connections having the smallest values. The MTU is described

in RFC 1191.

multicast

Multicast refers to a network addressing method in which the source transmits a packet to multiple

destinations, a multicast group, simultaneously. See also PIM, SMR.

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