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Error Control In Data Link Layer And Transport Layer

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the need of error control at the data link layer when the transport layer provides error control? What is the difference between data link layer and transport layer error detection is that difference between the two error controls?UpdateCancelAnswer Wiki3 Answers Tony Li, Internet difference between flow control in data link layer and transport layer construction crew, emeritus.Written 86w ago · Upvoted by William Emmanuel Yu, computer networks teacherCongratulations, you've detected an

Flow Control In Data Link Layer Vs Flow Control In Transport Layer

architectural flaw! You're absolutely correct, error detection and correction is done redundantly. This is because networking is an agreement between parties, that at different layers, we have

Error Control In Data Link Layer Ppt

different standards committees, and because there is politics and rivalry between those committees that prevents logical and beneficial outcomes.Link level error control happens on a packet-by-packet basis on each and every link. For Ethernet, this is a CRC-32 over the entire frame. This is implemented in hardware and is basically a trivial sunk cost.The transport similarities between transport layer and data link layer checksum is within TCP and optionally UDP, and covers the TCP pseudo-header, plus the attached data segment. It's a much weaker checksum, but is crucially an end-to-end checksum. The end-to-end property is vital because there are many functions touching the packet between source and destination, and only some of them covered by the link-level checksum. Every router is taking the packet, making modifications and then transmitting it again. While good routers implement error detection and correction internally, those implementations could easily be flawed and could trivially introduce packet corruption. The end-to-end checksum is a protection against this.In an ideal world, if we had the ability to restart the Internet, we would have a much stronger transport layer checksum, such as a CRC-32, and we wouldn't have to pay the link level checksum tax everywhere.5.1k Views · View Upvotes · Answer requested by Paulo CostaRelated QuestionsMore Answers BelowWhy do certain tasks (e.g. error analysis/detection and data flow control) in the link and transport layer overla

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Compare And Contrast Between The Transport Layer And The Data Link Layer

company Business Learn more about hiring developers or posting ads with us Network Engineering Questions flow and error control in data link layer Tags Users Badges Unanswered Ask Question _ Network Engineering Stack Exchange is a question and answer site for network engineers. Join them; distinguish between the error control provided by the data link layer and the transport layer it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Difference between data link and transport https://www.quora.com/What-is-the-need-of-error-control-at-the-data-link-layer-when-the-transport-layer-provides-error-control-What-is-the-difference-between-the-two-error-controls layer error detection? up vote 1 down vote favorite I know that Ethernet frames (data link layer) has a FCS in the trailer. I also know that transport layer protocols both have error detection checksums as well. My question is, what is the difference between Data Link and Transport layer error detection? Don't they both do the same thing? Seems kind of redundant. I appreciate any insights. Thank you. ethernet osi packet-loss transport-protocol http://networkengineering.stackexchange.com/questions/26173/difference-between-data-link-and-transport-layer-error-detection data share|improve this question asked Jan 22 at 8:24 user1330287 434 add a comment| 1 Answer 1 active oldest votes up vote 3 down vote Link layer Error Detection: A method to verify the integrity of frames when they are transmited over the media. The receiving side can verify if the received frame has been damaged on transit. If link layer detects a damaged frame, then it discards the frame and could or not ask for a retransmission. (Ethernet never asks for retransmission, it simply discards). Transport layer Error Control: The sending side send segments that are divided on multiple packets at network layer and each packet on multiple frames at link level. Each segment travels the network (divided as frames and packets) and is recomposed only at the receiving side. Between the sending and receiving side could be a lot of intermediate routers. During that transit there could be problems as: One or more frames are discarded. One or more packets get lost. Packets lose their original order. A malfunctioning router modifies the data in a packet These problems will pass undetected through the routers until they get to the error control of the transport layer on the receiving side. This error control verifies that there wasn't problems on the underneath layers problems and asks for retran

DCN - Network LAN Technologies DCN - Computer Network Topologies DCN - Computer Network Models DCN - Computer Network Security Physical https://www.tutorialspoint.com/data_communication_computer_network/data_link_control_and_protocols.htm Layer DCN - Physical Layer Introduction DCN - Digital Transmission DCN - Analog Transmission DCN - Transmission media DCN - Wireless Transmission DCN - Multiplexing DCN - Network https://learningnetwork.cisco.com/thread/49629 Switching Data Link Layer DCN - Data Link Layer Introduction DCN - Error detection and Correction DCN - Data Link Control & Protocols Network Layer DCN - Network data link Layer Introduction DCN - Network Addressing DCN - Routing DCN - Internetworking DCN - Network Layer Protocols Transport Layer DCN - Transport Layer Introduction DCN - Transmission Control Protocol DCN - User Datagram Protocol Application Layer DCN - Application Layer Introduction DCN - Client-Server Model DCN - Application Protocols DCN - Network Services DCN Useful Resources data link layer DCN - Quick Guide DCN - Useful Resources DCN - Discussion Selected Reading Developer's Best Practices Questions and Answers Effective Resume Writing HR Interview Questions Computer Glossary Who is Who DCN - Data-link Control & Protocols Advertisements Previous Page Next Page Data-link layer is responsible for implementation of point-to-point flow and error control mechanism. Flow Control When a data frame (Layer-2 data) is sent from one host to another over a single medium, it is required that the sender and receiver should work at the same speed. That is, sender sends at a speed on which the receiver can process and accept the data. What if the speed (hardware/software) of the sender or receiver differs? If sender is sending too fast the receiver may be overloaded, (swamped) and data may be lost. Two types of mechanisms can be deployed to control the flow: Stop and Wait This flow control mechanism forces the sender after transmitting a data frame to stop and wait until the ackno

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