TCP/IPv6 Configuration and Management Manual (G06.29+, H06.03+, J06.03+)

Glossary
HP NonStop TCP/IPv6 Configuration and Management Manual—524523-012
Glossary-13
Level 2
Level 2. A reference to LINK LEVEL communication (for example, frame formats) or link-
level connections derived from the ISO 7-layer reference model. For long-haul
networks, level 2 refers to the communication between a host computer and a network
packet switch (for example, HDLC/LAPB). For local area networks, level 2 refers to
physical packet transmission. Therefore, a level 2 address is a physical hardware
address.
Level 3. A reference to NETWORK-level communication derived from the ISO 7-layer
reference model. For the Internet, level 3 refers to the IP and IP datagram formats.
Therefore, a level 3 address is an Internet address.
LIF. See logical interface (LIF).
link. a communication facility or medium over which nodes can communicate at the link
layer, that is, the layer immediately below IP. Examples are Ethernet and internet (or
higher) layer tunnels, such as tunnels over IPv4 or IPv6 itself.
link-layer address. A link-layer identifier for an interface. Examples include IEEE 802
addresses for Ethernet links and E.164 addresses for ISDN links.
link-local address . An address having link-only scope that can be used to reach
neighboring nodes attached to the same link. All interfaces have a link-local unicast
address.
link MTU. The maximum transmission unit, for example, maximum packet size in octets,
that can be conveyed over a link.
LLC. See Logical Link Control (LLC).
LNP. See logical-network partitioning.
local area network (LAN). A network that is located in a small geographical area and
whose communications technology provides a high-bandwidth, low-cost medium to
which low-cost nodes can be connected. One or more LANs can be connected to the
system such that the LAN users can access the system as if their workstations were
connected directly to it.
logical interface (LIF). The interface that allows an application or another process to
communicate with data communications hardware.
Logical Link Control (LLC). An IEEE 802.2 standard for the Data Link Layer of the OSI
Reference Model that defines both connection-oriented and connectionless standards
over LAN networks.
logical-network partitioning. A NonStop TCP/IPv6 feature that lets you divide the system
into separately addressed IP subnetworks whereby applications have access only to a
defined set of network interfaces (IP addresses).