Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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.
Define Mapping and List mapping procedure? The transformation of data from main memory to cache memory is known as an Mapping. Associative mapping Direct mapping
what is cardinality ratio?
can you deign the schematic of a modified digital clock at the gate as well as the IC level and then construct the circuit, lab spec and industral spec?
Describe queue? Ans: It is a type of data structure in which the data are stored in and retrieved on a First in first out (FIFO) basis. It grows in the direction of increasin
Consider the situation in which the disk read/write head is currently located at track 45 (of tracks 0-255) and moving in the positive direction. Assume that the following track re
What is interactive reporting? A classical non-interactive report having of one program that makes a single list. Instead of one extensive and detailed list, with interactive
What are the advantages of having e-commerce over extranets? Extranets are about " joining up" the supply chain-suppliers, resellers, distributors, customers, etc.-enabling
Handler's Classification In 1977, Wolfgang Handler proposed an detailed notation for expressing the parallelism and pipelining of computers. Handler's classification addresses
Q. What do you mean by shopping bots? ANSWER: A shopping bot or buyer agent is an intelligent agent on a Web site that assists you, the customer, search the products and servic
Question: (a) In order to encourage the development mobile technologies, Europe has opted for standardisation. What is the rationale behind this? Provide concrete examples of h
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd