3Com 3CBLSG48 User Guide - Page 224

appendix F: gLOSSARY 213 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 or VLAN. 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 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. 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. Out-of-Band Management 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. Private VLANs Private VLANs provide port-based security and isolation between ports within the assigned VLAN. Data traffic on downlink ports can only be forwarded to, and from, uplink ports.