Cisco 500 Series, Configuration Manual

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Glossary
GL-12
Cisco Security Appliance Command Line Configuration Guide
OL-12172-03
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.
MS
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 .
N
N2H2
A third-party, policy-oriented filtering application that works with the security appliance to control
user web access. N2H2 can filter
HTTP requests based on destination host name, destination IP
address, and username and password. The N2H2 corporation was acquired by Secure Computing in
October, 2003.
NAT
Network Address Translation. Mechanism for reducing the need for globally unique IP addresses.
NAT allows an organization with addresses that are not globally unique to connect to the
Internet by
translating those addresses into a globally routable address space.
NEM
Network Extension Mode. Lets VPN hardware clients present a single, routable network to the remote
private network over the VPN tunnel.
NetBIOS
Network Basic Input/Output System. A Microsoft protocol that supports Windows host name
registration, session management, and data transfer. The security appliance supports NetBIOS by
performing
NAT of the packets for NBNS UDP port 137 and NBDS UDP port 138.
netmask
See mask .
network
In the context of security appliance configuration, a network is a group of computing devices that
share part of an IP address space and not a single host. A network consists of multiple nodes or hosts.
See also
host , Internet , intranet , IP , LAN , and node .