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lan switching and wireless
34
Computer Networking
Undergraduate 1
12/01/2013

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Term
access layer
Definition
interfaces with end devices such as pc printers to provide access to the rest of the network
Term
distribution layer
Definition
aggregates the data received from the access layer switches before it is transmitted to the core layer for routing to its final destination
Term
core layer
Definition
is a high speed backebone of the internetwork
Term
scalability
Definition
a desrable property of a network to handle growing amounts of traffic in a graceful manner
Term
redundany
Definition
the duplication of devices services or connections so that in the event of a failure the redundant devices services or connections can perform the work of those that failed
Term
performance
Definition
is enhanced  by avoiding the transmission of data though low performing intermediary switches
Term
security
Definition
an ecopromising term describing the prevention and means of prevention of unauthorized access to an entity location or system
Term
mangeability
Definition
a measure of the lack of difficulty in managing a network devices using network menagement sofware and protocols
Term
maintainablity
Definition
a mesaure if the lack of difficulity in keeping network devices and associated software in working order
Term
voice over ip
Definition
the capablitiy to carry voice traffic over an ip based network with pots like functionality relaibility and voice quality
Term
covergence
Definition
the speed and capability of a group of switches running STP to agree on a loop free layer2 topology for a switched lan
Term
quality of seervice
Definition
a measure of performance for a tramission system that reflects its transmission quality and service available
Term
private branch exchange
Definition
a digital or analog telephone switchboard located on the subscriber premeises and used to connect private and public telephone networks
Term
power over ethernet
Definition
the powering network devices over ethernet cable
Term
multilayer switch
Definition
a mulitilayer  switch filters and forwards packets based on osi layer2 through layer7 information at wire speed by utilizing dedicated hardware that stores data structures mirroring routing table apr table and acl information
Term
read only memory
Definition
nonvitale memeory that can be read not written by the microproccesor
Term
organized unique identifiyer
Definition
a 3byte hexadecimal number that the ieee registration authority assigns to any company that manufactures components under the iso/iec8802 standard
Term
half duplex
Definition
refers to the  transmission of data that in just one direction at a time
Term
full duplex
Definition
the capability of a port for simultaneous data tranmission and reception
Term
auto-mdix
Definition
an opotimal feature of catalist switches
Term
floods
Definition
a data trafficking tectnique used by switches in which traffic received on an interface is sent out all other the other interfaces of the switch
Term
virtual
Definition
a group of host with a common set of requirements that communicate as if they were attached to the samed wire regaurdless pf their physical location
Term
propoganda delay
Definition
the time lag between the departure signal from the source and the arrival of the signal at destination
Term
store and forward
Definition
a technique in which frames are completly proccessed before being forwarded out to the appropriate port
Term
cut through switching
Definition
an enthernet frame switching approach that streams data through a switch so that the leading edge of a packet exits the switch at the egress port before the packet finshes entering the ingress port
Term
graphical user interface
Definition
an enviorment that uses pictorial as well as tectual representation of the input and output applications and the data structures in which the information is stored
Term
simple network manage protocol
Definition
used to monitor and control network devices and to manage configurations statistics collections performance and security
Term
non volitale ram
Definition
ram that retains its contents when device is powered off
Term
trivial file
Definition
a simplified version of ftp that allows files to be transferred from one computer to another over a network  in clear text without authentication
Term
encryption
Definition
the application of a specific algorithym to data so as to alter the appearence of the data making it incomprehensible to those who are not authorized to see the information
Term
spoof
Definition
the act of a packet or frame being represented with a false source address to mask its true source
Term
cisco discovery protocol
Definition
a media that and protocol independent device discovery protocol that runs on all cisco manufactred equipment including rounters  access servers bridges and switches
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