CCNA Cisco Certified Network Associate Study Guide - FTP Server

710 Glossary
subinterface One of many virtual interfaces available on a single physical
interface.
subnet See: subnetwork.
subnet address The portion of an IP address that is specifically identified
by the subnet mask as the subnetwork. See also: IP address, subnetwork, and
subnet mask.
subnet mask Also simply known as mask, a 32-bit address mask used in
IP to identify the bits of an IP address that are used for the subnet address.
Using a mask, the router does not need to examine all 32 bits, only those
selected by the mask. See also: address mask and IP address.
subnetwork 1) Any network that is part of a larger IP network and is
identified by a subnet address. A network administrator segments a network
into subnetworks in order to provide a hierarchical, multilevel routing structure,
and at the same time protect the subnetwork from the addressing complexity
of networks that are attached. Also known as a subnet. See also: IP
address, subnet mask, and subnet address. 2) In OSI networks, the term specifically
refers to a collection of ESs and ISs controlled by only one administrative
domain, using a solitary network connection protocol.
SVC switched virtual circuit: A dynamically established virtual circuit, created
on demand and dissolved as soon as transmission is over and the circuit
is no longer needed. In ATM terminology, it is referred to as a switched virtual
connection. See also: PVC.
switch 1) In networking, a device responsible for multiple functions such
as filtering, flooding, and sending frames. It works using the destination
address of individual frames. Switches operate at the Data Link layer of the
OSI model. 2) Broadly, any electronic/mechanical device allowing connections
to be established as needed and terminated if no longer necessary.
switch fabric Term used to identify a layer-2 switched internetwork with
many switches.
switched LAN Any LAN implemented using LAN switches. See also:
LAN switch.