Error Detection Important Data Link Layer
Contents |
DCN - Network LAN Technologies DCN - Computer Network Topologies DCN - Computer Network Models DCN - Computer Network Security Physical Layer DCN - Physical Layer Introduction DCN - Digital
Data Link Layer Error Detection And Correction
Transmission DCN - Analog Transmission DCN - Transmission media DCN - Wireless Transmission error detection in data link layer is achieved by DCN - Multiplexing DCN - Network Switching Data Link Layer DCN - Data Link Layer Introduction DCN - Error
Error Detection Techniques In Data Link Layer
detection and Correction DCN - Data Link Control & Protocols Network Layer DCN - Network Layer Introduction DCN - Network Addressing DCN - Routing DCN - Internetworking DCN - Network Layer Protocols error detection methods in data link layer 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 DCN - Quick Guide DCN - Useful Resources DCN - Discussion Selected Reading Developer's Best Practices Questions and Answers Effective Resume Writing HR Interview Questions Computer data link layer protocols pdf Glossary Who is Who DCN - Error Detection & Correction Advertisements Previous Page Next Page There are many reasons such as noise, cross-talk etc., which may help data to get corrupted during transmission. The upper layers work on some generalized view of network architecture and are not aware of actual hardware data processing.Hence, the upper layers expect error-free transmission between the systems. Most of the applications would not function expectedly if they receive erroneous data. Applications such as voice and video may not be that affected and with some errors they may still function well. Data-link layer uses some error control mechanism to ensure that frames (data bit streams) are transmitted with certain level of accuracy. But to understand how errors is controlled, it is essential to know what types of errors may occur. Types of Errors There may be three types of errors: Single bit error In a frame, there is only one bit, anywhere though, which is corrupt. Multiple bits error Frame is received with more than one bits in corrupted state. Burst error Frame contains more than1 consecutive bits corrupted. Error control mechanism may involve two possible ways: Error
called frames. Note that frames are nothing more than ``packets'' or ``messages''. By convention, we'll use the term ``frames'' when discussing DLL packets. Sender checksums the frame and
Flow Control In Data Link Layer
sends checksum together with data. The checksum allows the receiver to determine when error control in data link layer a frame has been damaged in transit. Receiver recomputes the checksum and compares it with the received value. If
Data Link Layer Functions
they differ, an error has occurred and the frame is discarded. Perhaps return a positive or negative acknowledgment to the sender. A positive acknowledgment indicate the frame was received without errors, https://www.tutorialspoint.com/data_communication_computer_network/error_detection_and_correction.htm while a negative acknowledgment indicates the opposite. Flow control. Prevent a fast sender from overwhelming a slower receiver. For example, a supercomputer can easily generate data faster than a PC can consume it. In general, provide service to the network layer. The network layer wants to be able to send packets to its neighbors without worrying about the details of getting it there https://web.cs.wpi.edu/~cs4514/b98/week3-dll/week3-dll.html in one piece. At least, the above is what the OSI reference model suggests. As we will see later, not everyone agrees that the data link layer should perform all these tasks. Design Issues If we don't follow the OSI reference model as gospel, we can imagine providing several alternative service semantics: Reliable Delivery: Frames are delivered to the receiver reliably and in the same order as generated by the sender. Connection state keeps track of sending order and which frames require retransmission. For example, receiver state includes which frames have been received, which ones have not, etc. Best Effort: The receiver does not return acknowledgments to the sender, so the sender has no way of knowing if a frame has been successfully delivered. When would such a service be appropriate? When higher layers can recover from errors with little loss in performance. That is, when errors are so infrequent that there is little to be gained by the data link layer performing the recovery. It is just as easy to have higher layers deal with occasional lost packet. For real-time applications requiring ``better never than l
von GoogleAnmeldenAusgeblendete FelderBooksbooks.google.dehttps://books.google.de/books/about/Computer_Network.html?hl=de&id=FlogQkjWX8gC&utm_source=gb-gplus-shareComputer NetworkMeine BücherHilfeErweiterte BuchsucheDruckversionKein E-Book verfügbarAmazon.deBuch.deBuchkatalog.deLibri.deWeltbild.deIn Bücherei suchenAlle Händler»Stöbere bei Google https://books.google.com/books?id=FlogQkjWX8gC&pg=SA3-PA20&lpg=SA3-PA20&dq=error+detection+important+data+link+layer&source=bl&ots=VuVZ7w6xyw&sig=OXPHVAARa-HNWJJEP3_pbLc3zqg&hl=en&sa=X&ved=0ahUKEwjow4yg98rPAhUn2IMKHbgYD Play nach Büchern.Stöbere im größten eBookstore der Welt http://www.highteck.net/EN/DataLink/Data_Link_Layer.html und lies noch heute im Web, auf deinem Tablet, Telefon oder E-Reader.Weiter zu Google Play »Computer NetworkV.S.Bagad, I.A.DhotreTechnical Publications, 01.01.2009 - 408 Seiten 2 Rezensionenhttps://books.google.de/books/about/Computer_Network.html?hl=de&id=FlogQkjWX8gC Voransicht des Buches » data link Was andere dazu sagen-Rezension schreibenEs wurden keine Rezensionen gefunden.Ausgewählte SeitenTitelseiteInhaltsverzeichnisIndexInhaltTable of Contents 1-1 Points to Remember 159 1-59 Review Questions 261 2-61 Points to Remember 344 3-44 Chapter5 The Network Layer 51 to 580 5-1 Review Questions 642 data link layer 6-42 Computer Network P-8 Urheberrecht Andere Ausgaben - Alle anzeigenComputer NetworkV.S.Bagad,I.A.DhotreEingeschränkte Leseprobe - 2009Häufige Begriffe und Wortgruppenacknowledgement ALOHA application bandwidth Bluetooth bridge broadcast buffer byte called channel checksum choke packet circuit switching client co-axial cable communication Congestion control connection connectionless connectors CSMA/CD data link layer data rate data transfer datagram destination address devices error detection Ethernet fiber optic field flow control frame format frame relay frequency functions HDLC header host ICMP identifier IEEE interface Internet IP address maximum Mbps multicast multiple multiplexing network layer node octets operation OSI model OSPF packet switching parity check payload physical layer point-to-point port number protocol provides receiver Refer section repeater retransmitted router routing algorith
basic services: Allows the upper layers to access the media using techniques such as framing Controls how data is placed onto the media and is received from the media using techniques such as media access control and error detection As with each of the OSI layers, there are terms specific to this layer: Frame - The Data Link layer PDU Node - The Layer 2 notation for network devices connected to a common medium Media/medium (physical)* - The physical means for the transfer of information between two nodes Network (physical)** - Two or more nodes connected to a common medium The Data Link layer is responsible for the exchange of frames between nodes over the media of a physical network. * It is important to understand the meaning of the words medium and media within the context of this chapter. Here, these words refer to the material that actually carries the signals representing the transmitted data. Media is the physical copper cable, optical fiber, or atmosphere through which the signals travel. In this chapter media does not refer to content programming such as audio, animation, television, and video as used when referring to digital content and multimedia. ** A physical network is different from a logical network. Logical networks are defined at the Network layer by the arrangement of the hierarchical addressing scheme. Physical networks represent the interconnection of devices on a common media. Sometimes, a physical network is also referred to as a network segment. Upper Layer Access to Media As we have discussed, a network model allows each layer to function with minimal concern for the roles of the other layers. The Data Link layer relieves the upper layers from the responsibility of putting data on the network and receiving data from the network. This layer provides services to support the communication processes for each medium over which data is to be