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Data Link layer in the ISO 7-Layer Data Communications Protocol. This is related directly to the

hardware interface for network devices and passes on traffic based on MAC addresses.

Link Aggregation

See Port Trunk.

Link Aggregation Control Protocol (LACP)

Allows ports to automatically negotiate a trunked link with LACP-configured ports on another

device.

Management Information Base (MIB)

An acronym for Management Information Base. It is a set of database objects that contains

information about a specific device.

MD5 Message-Digest Algorithm

An algorithm that is used to create digital signatures. It is intended for use with 32 bit machines

and is safer than the MD4 algorithm, which has been broken. MD5 is a one-way hash function,

meaning that it takes a message and converts it into a fixed string of digits, also called a message

digest.

Network Time Protocol (NTP)

NTP provides the mechanisms to synchronize time across the network. The time servers operate

in a hierarchical-master-slave configuration in order to synchronize local clocks within the subnet

and to national time standards via wire or radio.

Port Authentication

See IEEE 802.1X.

Port Mirroring

A method whereby data on a target port is mirrored to a monitor port for troubleshooting with a

logic analyzer or RMON probe. This allows data on the target port to be studied unobstructively.

Port Trunk

Defines a network link aggregation and trunking method which specifies how to create a single

high-speed logical link that combines several lower-speed physical links.

Remote Authentication Dial-in User Service (RADIUS)

RADIUS is a logon authentication protocol that uses software running on a central server to

control access to RADIUS-compliant devices on the network.

Remote Monitoring (RMON)

RMON provides comprehensive network monitoring capabilities. It eliminates the polling required

in standard SNMP, and can set alarms on a variety of traffic conditions, including specific error

types.

Rapid Spanning Tree Protocol (RSTP)

RSTP reduces the convergence time for network topology changes to about 10% of that required

by the older IEEE 802.1D STP standard.

Secure Shell (SSH)

A secure replacement for remote access functions, including Telnet. SSH can authenticate users

with a cryptographic key, and encrypt data connections between management clients and the

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