3Com 3CRDSF9PWR manual Link Aggregation See Port Trunk, Port Authentication See Ieee

246APPENDIX E: GLOSSARY

Layer 2 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.

Layer 3 Network layer in the ISO 7-Layer Data Communications Protocol. This layer handles the routing functions for data moving from one open system to another.

Link Aggregated Aggregates ports or VLANs into a single virtual port. Group (LAG)

Link Aggregation See Port Trunk.

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

(MIB)

MD5 Message Digest An algorithm that is used to create digital signatures. It is intended for Algorithm 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.

Multicast Switching A process whereby the switch filters incoming multicast frames for services for which no attached host has registered, or forwards them to all ports contained within the designated multicast VLAN group.

Network Time NTP provides the mechanisms to synchronize time across the network. Protocol (NTP) 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.

Out-of-BandManagement of the network from a station not attached to the Management network.

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.