Discuss the csma/cd and csma/ca protocols, Computer Engineering

Assignment Help:

Discuss the CSMA/CD and CSMA/CA protocols.

CSMA/CD: this is an access method used mainly with LANs configured in a bus topology. Along with CSMA/CD, any station (node) can send a message to another station (or stations) as long as the transmission medium is free of transmissions from another station. Stations monitor (listen to) the line to find out if the line is busy. If the station has a message to transmit but the line is busy, this waits for an idle condition before transmitting message of this. If two stations transmit at similar time, collisions arise. When this occurs, the station first sensing the collision sends a special jamming signal to all other stations on the network. All stations then cease transmitting (back off) and wait a random period of time before attempting a retransmission. The random delay times for all stations are different, and therefore, permit for prioritizing the stations on the network. If successive collisions happen, the back off period for every station is twice. Along with CSMA/CD stations should contend for the network. A station has not guaranteed access to the network. To notice the occurrence of a collision, a station must be capable of transmitting and receiving simultaneously. CSMA/CD is used with most LANs configured in a bus topology. Ethernet is an illustration of a LAN which uses CSMA/CD.

CSMA/CA: this belongs to a class of protocols termed as multiple access methods. CSMA/CA stands for: Carrier Sense Multiple Access with Collision Avoidance. In Carrier Sense Multiple Access, a station wishing to transmit has to primary listen to the channel for a predetermined amount of time therefore as to check for any activity on the channel. If the channel is sensed "idle" then the station is allowed to transmit. If the channel is sensed like "busy" the station has to defer its transmission. It is the essence of both CSMA/CA and CSMA/CD. In CSMA/CA (Local Talk), a station sends a signal telling all other stations not to transmit only one time the channel is clear then sends its packet. In Ethernet 802.3, the station carries on to wait for a time and checks to observe if the channel is even free. If this is free, the station transmits, and waits for an acknowledgment signal which the packet was received.


Related Discussions:- Discuss the csma/cd and csma/ca protocols

Explain the product of sum form - standard forms, Explain the Product of Su...

Explain the Product of Sum Form - standard forms? The POS is the Boolean Expression containing OR terms, called as sum terms. The product denotes ANDing of these terms. F= (

Search-based tools, The search-based tools initially identify the problem a...

The search-based tools initially identify the problem and after that appropriately give advice on how to correct it. AT Expert from Cray Research is one of the tools being used

Gralands robots, You have been contacted by Jean-Luc Picard commanding offi...

You have been contacted by Jean-Luc Picard commanding officer of Star Trek: The Next Generation. The Commander needs your support to develop a software routine to simulate the Robo

Develop a system to store change logs , The ?rst task in the project is to ...

The ?rst task in the project is to develop a sane system to store change logs and versions of ?les. The simplest approach is to create a "dot" directory in the location of the ?le

Explain parallel overhead, Parallel Overhead The amount of time needed ...

Parallel Overhead The amount of time needed to organize parallel tasks, as opposed to undertaking useful work. Parallel overhead may comprise factors like:   1) Task start-u

The long and short date option , In MS Access, the long and short date opti...

In MS Access, the long and short date option does not show 4 digit years. How do I achieve the mm/dd/yyyy format? Ans) In the date field properties of the table, form, or prop

JSP, What is java server pages

What is java server pages

Define a segment index or an internal index, The field that contains a segm...

The field that contains a segment index or an internal index is called ? Ans. Target datum consists of a segment index or an internal index.

Explain 32 to 1 multiplexer tree, Why is Multiplexer Tree needed? Draw ...

Why is Multiplexer Tree needed? Draw the block diagram of a 32:1 Multiplexer Tree and explain how input is directed to the output in this system. Ans. One of the possible

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd