- LAN (local-area network)
A network that by definition includes components that are
relatively near to each other, typically in the same
- LAN legal
A term created just for this book to make an analogy to having
a car be "street legal."
- LAN switch
A networking device that forwards frames based on their
A subset of protocols of a single networking model. The
protocols in the same layer have the same general or related
- Layer 8
A sarcastic term referring to business, political, or other
nontechnical issues that might affect network design choices. It refers to a
nonexistent OSI layer, just above the highest OSI layer.
With LAN switches, "learning" refers to the process of
examining the source MAC address of frames that the switch received, and adding
new entries to the MAC address table. The switch adds an entry listing the
source MAC address of the frame, along with the port in which the frame was
- leased circuit
- See [WAN
- leased line
A service from telephone companies that provides a
communication path between a pair of sites.
- lightning bolt
A style of drawing a line so that it looks like a bolt of
lightning. WAN links are often drawn with a lightning bolt line style in network
- LLC (Logical
Another name for 802.2.
- local-area network (LAN)
- See [LAN]
- local host file
A file on an individual computer that holds a list of host
names and their corresponding IP addresses. A host computer can look at this
local host file to perform name resolution.
- local loop
A cable from the premises of a telephone subscriber to the
telephone company CO.
- Logical Link Control (LLC)
- See [LLC]
- loopback circuit
On an Ethernet NIC, hardware that causes the electrical signal
sent by the NIC to also be received on the NIC, without passing over the
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