3Com 2924-PWR manual

240APPENDIX F: GLOSSARY

Internet Control A network layer protocol that reports errors in processing IP packets. Message Protocol ICMP is also used by routers to feed back information about better

(ICMP) routing choices.

Internet Group A protocol through which hosts can register with their local router for Management multicast services. If there is more than one multicast switch/router on a

Protocol (IGMP) given subnetwork, one of the devices is made the “querier” and assumes responsibility for keeping track of group membership.

In-Band Management Management of the network from a station attached directly to the network.

IP Multicast Filtering A process whereby this switch can pass multicast traffic along to participating hosts.

IP Precedence The Type of Service (ToS) octet in the IPv4 header includes three precedence bits defining eight different priority levels ranging from highest priority for network control packets to lowest priority for routine traffic. The eight values are mapped one-to-one to the Class of Service categories by default, but may be configured differently to suit the requirements for specific network applications.

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 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 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.