HP T1453-90001 manual Glossary, Maximum Transmission Unit MTU

Glossary

IP:

IP: Internet protocol.

IP Address: See Internet Address glossary entry.

LAN: See Local Area Network.

Local Area Network (LAN): A data communications system that allows a number of independent devices to communicate with each other.

Local Network: The network to which a node is directly attached.

Maximum Transmission Unit (MTU).

Largest amount of data that can be transmitted through that interface. This value does not include the LLC or MAC headers.

NetTL. HP’s tracing and logging facility for HP-UX networking.

Network Interface: A communication path through which messages can be sent and received. A hardware network interface has a hardware device associated with it, such as a LAN card. A software network interface does not include a hardware device, for example the loopback interface. For every IP address instance, there must be one network interface configured.

NIC: Network interface card.

PCI: Peripheral component interconnect.

PPA: Physical point of attachment. A PPA is the point at which a system is attached to a physical communications medium. All communication on that physical medium funnels through the PPA.

QoS: Quality of Service. The ability to provide guarantees for data transfer -- for example, latency, throughput, and discard priority.

SAM: System admin manager. GUI-based HP tool for system configuration and management.

Shared media LAN: A local area network (LAN) that shares all its bandwidth among all stations.

Switch: A network interconnection device that allows multiple connected senders and receivers to communicate simultaneously in contrast to a hub (repeater) where only one device can send at a time. Some switches have fixed port speeds (10 Mbit/s or 100 Mbit/s) while others allow port speeds to be configured or autonegotiated.

Tag aware: Devices such as switches, routers, and end-stations that can interpret VLAN tags. See also VLAN-aware.

TCP: Transmission control protocol.

Topology: The physical and logical geometry governing placement of nodes in a computer network. Also, the layout of the transmission medium for a network.

ToS: IPv4 Type of Service field which indicates the desired service expected by an IP packet for delivery through routers across the IP internetwork. The size of this field is 8 bits, which contain bits for precedence, delay, throughput, and reliability characteristics.

UTP (Unshielded Twisted Pair) Cabling: A data cable type consisting of pairs of wires twisted together without an electrically shielding jacket.

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