Idea of “The IEEE standardized protocol”-Part-11

Switch :

A network device that filters,forwards,and floods frames based on each frame’s destination addres.The switch operates at the data link layer of the Open system interconnection (OSI) reference model.

Synchronous :

The imposition of time ordering on a bit stream.Practically,a device will try to use the same speed as another device on the other end of aserial link.However,by examining transitions between voltage states on the link,the device can notice slight variations in the speed on each end and can adjust its speed accordingly.

 
TETP :

Trivial File Transfer Protocol.A simplified version of File Transfer Protocol (FTP) that allows files to be transferred from one computer to another over anetwork,usally without the use of client authentication (for example,username and password).

Topology database :

The structured data thyat dscribes the network topology to a routing protocol.Link- state and balanced hybrid routing protocols use topology tables,from which they build the entries in the routing table.

Trunking :

Also called VLAN trunking.A method (using either Cisco’s ISL protocol or the IEEE 802.1Q protocol)to support multiple VLANs that have members on more than oe switch.

Update timer :

The time interval that regulates how often a routing protocol sends its nextperiodic routing updates.Distance vector routing protocols send full routing updates every update interval.

Variance :

IGRP and EIGRP compute their metrics,so the metrics for different routes to the same subnet seldom have athe exact same value.The variance value is multipled with the lower metric when multiple routes to the same subnet exist.Ifthe product is larger than the metrics for other routes,the routes are considered of “equal”metric,allowing multiple routes to be added to the routing table.

Virtual Circuit.A logical concept that represents the path that frames travel between DTEs. VCs are particularly useful when comparing Frame Relay to leased physical circuits.

VLAN  :

Virtual LAN.A group of devices on one or more LANs that are configured (using management software) so that they can communicates as if they were attached to the same wire when in fact they are located on a number of different LAN segments.Because VLANs are based on a logical instead of physical connections,they are extremely flexible.

VLSM  :

Variable-Length Subnet Mask(ing).The capability to specify a different subnet mask for the same Class A,B.or C network number on different subnets.VLSM can help optimize available address space.

VLAN Trunking Protocol.Cisco switches use this proprietary protocol to exchange VLAN configuration information between switches.VTP defines a Layer 2 messaging protocol that allows the switches to exchange VLAN configuration information so that the VLAN configuration stays consistent throughout a network.VTP manages the additions,deletions,and name changes of VLANs across multiple switches.It is also reduces broadcast overhead through the use of VTP pruning.

Zero subnet :

When subnetting a Class A,B.or C network ,two subnet numbers are “discouraged” from use;the zero subnet is one of these two subnets.It is the subnet number for which the subnet bits all have a value of binary 0.