Error Control Data Link Control
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Introduction[edit] Data link layer is layer 2 in OSI model. It is responsible for communications between adjacent network nodes. It handles the data moving in and flow and error control in data link layer out across the physical layer. It also provides a well defined service error control in data link layer ppt to the network layer. Data link layer is divided into two sub layers. The Media Access Control (MAC) synchronous data link control and logical Link Control (LLC). Data-Link layer ensures that an initial connection has been set up, divides output data into data frames, and handles the acknowledgements from a receiver that the
Data Link Control Protocols
data arrived successfully. It also ensures that incoming data has been received successfully by analyzing bit patterns at special places in the frames. In the following sections data link layer's functions- Error control and Flow control has been discussed. After that MAC layer is explained. Multiple access protocols are explained in the MAC layer section. Error Control[edit] Network is responsible for transmission data link control and display unit of data from one device to another device. The end to end transfer of data from a transmitting application to a receiving application involves many steps, each subject to error. With the error control process, we can be confident that the transmitted and received data are identical. Data can be corrupted during transmission. For reliable communication, error must be detected and corrected. Error control is the process of detecting and correcting both the bit level and packet level errors. 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. Burst Error In term burst error means that two or more bits in the data unit were changed. Burst error is also called packet level error, where errors like packet loss, duplication, reordering. Error Detection Error detection is the process of detecting the error during the transmission between the sender and the receiver. Types of error detection Parity checking Cyclic Redundancy Check (CRC) Checksum Redundancy Redundancy allows a receiver to check whether received da
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Flow Control And Error Control In Computer Networks
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Difference Between Flow Control And Error Control
Flowcontrol & error control at data link layer Upcoming SlideShare Loading in …5 × 1 1 of 23 Like this presentation? Why not share! Share Email Flow & Error Control https://en.wikibooks.org/wiki/Communication_Networks/Error_Control,_Flow_Control,_MAC bytameemyousaf 19459views Error Detection And Correction byRenu Kewalramani 41595views Flow Control byselvakumar_b1985 674views Data link layer byV R Siddhartha En... 3190views Data Link Layer byRutwik Jadhav 1081views Unit 4 data link layer bymekind 3602views Share SlideShare Facebook Twitter LinkedIn Google+ Email Email sent successfully! Embed Size (px) Start on Show related SlideShares at end WordPress Shortcode Link Flowcontrol & error control http://www.slideshare.net/hemangkothari/flowcontrol-error-control-at-data-link-layer at data link layer 12,523 views Share Like Download Hemang Kothari, Assistant Professor Follow 0 0 0 Published on Nov 14, 2013 Published in: Entertainment & Humor, Business 1 Comment 6 Likes Statistics Notes Full Name Comment goes here. 12 hours ago Delete Reply Spam Block Are you sure you want to Yes No Your message goes here Post Shivam Sharma You should know that Ethernet doesn't provide any flow control. It was in X.25 days that flow control was in implementation. 1 year ago Reply Are you sure you want to Yes No Your message goes here Mohd Mohsin , Programmer at ZARKA AL YAMAMA 1 year ago Krishna Panchal 1 year ago maditya679 1 year ago anoopjain87 1 year ago Nishit Bavishi , Student at Marwadi Education Foundation 2 years ago Show More No Downloads Views Total views 12,523 On SlideShare 0 From Embeds 0 Number of Embeds 5 Actions Shares 0 Downloads 529 Comments 1 Likes 6 Embeds 0 No embeds No notes for slide Flowcontrol & error control at data link layer 1. Flow and Error Control Prof. Hemang Kothari 2. Flow Control • Flow control coordinat
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- Understand the Following Topics:
- Flow and Error Contr
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?UpdateCancelAnswer Wiki3 Answers Tony Li, Internet construction crew, emeritus.Written 86w ago · Upvoted by William Emmanuel Yu, computer networks teacherCongratulations, you've detected an 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 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 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 overlap each other?Why there are flow control policies in both link l
- Flow and Error Contr