flow and error control techniques in computer networks ppt Palouse Washington

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flow and error control techniques in computer networks ppt Palouse, Washington

As we can see in fig(c ), the sender sends the frames from 0 to 3 as it's window size is 4. The data must be discarded entirely, and re-transmitted from scratch. Checksum is also on the concept of redundancy. byHemang Kothari 12619views Flow Control byselvakumar_b1985 687views Error Detection And Correction byRenu Kewalramani 41963views Module15: Sliding Windows Protocol ...

Receiver's window size is fixed and equal to the maximum number of sender's window size. r1 will take care of bit 1,3,5,7,9,11. But if the channel is busy, the station does not continuously sense it but instead of that it waits for random amount of time and repeats the algorithm. Distributed control and Centralized control, both can operate at the same time using interframe time interval.

Types of Errors Single Bit Error The term single bit error means that only one bit of the data unit was changed from 1 to 0 and 0 to 1. So to provide reliability, Selective repeat protocol was introduced. Protocols that listen for a carrier and act accordingly are called carrier sense protocols. In the response, if B wants to grant the permission, it will send the CTS packet to A giving permission to A for sending the packet.

Melde dich an, um dieses Video zur Playlist "Später ansehen" hinzuzufügen. Wird geladen... This type is not so much efficient, but it is simplest way of Flow Control. University of Education In Stop-and-Wait ARQ, numbering frames prevents the retaining of duplicate frames.

It is responsible for communications between adjacent network nodes. Once the channel has been acquired using CTS and RTS, multiple segments can be sent in a row. Name* Description Visibility Others can see my Clipboard Cancel Save Communication Networks/Error Control, Flow Control, MAC From Wikibooks, open books for an open world < Communication Networks Jump to: navigation, search It also ensures that incoming data has been received successfully by analyzing bit patterns at special places in the frames.

CSMA/CD and CSMA/CA The simplest CSMA scheme is for a station to sense the medium, sending packets immediately if the medium is idle. A Protocol Using Go Back N iii. Wird geladen... When a station wants to send a packet it will wait till the beginning of the next time slot.

Now, the bits are arranged such that different incorrect bits produce different error results and the corrupt bit can be identified. Bit map Reservation In Bit map reservation, stations reserves contention slots in advance. For reliable communication, error must be detected and corrected. TIMER, if sender was not able to get acknowledgment in the particular time than, it sends the buffered data once again to receiver.

Two CSMA/C stations are trying to transmit long files. Your cache administrator is webmaster. If the ACK is lost than sender will send 0 to 3 to receiver again but receiver is expecting to 4 to 7, so it will not accept it. As shown in the figure sender adds redundant bits (R) to the data unit and sends to receiver, when receiver gets bits stream and passes through checking function.

So this way the problem of duplication is solved. Pal, Department of Computer Science Engineering,IIT Kharagpur. If the remainder is zero then data unit is accepted and passed up the protocol stack, otherwise it is considered as having been corrupted in transit, and the packet is dropped. So collision detection is not possible.

Sliding Window Enhancements

  • Receiver can acknowledge frames without permitting further transmission (receive not ready)
  • Must send a normal acknowledge to resume
  • If duplex, use piggybacking
    • If no data to send, use University of Education Go-Back-N ARQ, lost frame 33. Figure 11.7 University of Education Recommended Gamification of Learning Flipping the Classroom Project Management Fundamentals Flowcontrol & error control at data link layer Hemang Kothari Flow Control selvakumar_b1985 Error Detection And When a station finds the channel idle, if it transmits the fame with probability 1, that this protocol is known as 1 -persistent. 1 -persistent protocol is the most aggressive protocol.

      This protocol has been developed to improve the performance of CSMA. In the following sections data link layer's functions- Error control and Flow control has been discussed. The MAC sublayer controls how a computer on the network gains access to the data and permission to transmit it. In this scheme we take Communication Channel error free, but if the Channel has some errors than receiver is not able to get the correct data from sender so it will

      Each parity bit will take care of its bits in the code. Pure ALOHA ALOHA is the simplest technique in multiple accesses. Error Control

      • Used to recover lost or damaged PDUs
      • Involves error detection and PDU retransmission
      • Implemented together with flow control in a single mechanism
      • Performed at various protocol levels
      University of Diese Funktion ist zurzeit nicht verfügbar.

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      MAC[edit] The data link layer is divided into two sublayers: The Media Access Control (MAC) layer and the Logical Link Control (LLC) layer. Stop and Wait -Diagram University of Education 18. So the time out will occur after the 8 packets, up to that it will not wait for the acknowledgment. A Protocol Using Selective Repeat Protocol using Go back N is good when the errors are rare, but if the line is poor, it wastes a lot of bandwidth on retransmitted

      And it also solve the problem of uses of more bandwidth, because in this scheme both sender and receiver uses the channel to send the data and receiver just send the This problem is called Exposed Station problem. Sliding Window Protocol A One-Bit Sliding Window Protocol A Protocol Using Go Back N A Protocol Using Selective Repeat A. If no transmission is taking place at the time, the particular station can transmit.

      Theoretically it is proved that maximum throughput for ALOHA is 18%.