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Error Detection Data Link Layer Transport Layer

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Data Link Layer Error Detection And Correction

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Error Detection Techniques In Data Link Layer

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 layer error detection? up vote 1 down vote favorite I know

Error Detection Methods In Data Link Layer

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 data share|improve this question asked Jan 22 at 8:24 user1330287 434 add a comment| 1 Answer 1 difference between flow control in data link layer and transport layer 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 retransmission. Summary: As most of the errors happen on the media, not on network layer (routers, for example) there is a little redundancy, however only Transport layer is under the obligation of asking for retransmissio

the need of error control at the data link layer when the transport layer provides error control? What is the difference between the difference between data link layer and transport layer error detection is that two error controls?UpdateCancelAnswer Wiki3 Answers Tony Li, Internet construction crew, emeritus.Written similarities between transport layer and data link layer 86w ago · Upvoted by William Emmanuel Yu, computer networks teacherCongratulations, you've detected an architectural flaw! You're absolutely flow control in data link layer vs flow control in transport layer 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 http://networkengineering.stackexchange.com/questions/26173/difference-between-data-link-and-transport-layer-error-detection 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 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 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 layer and transport layer?Why do we

be challenged and removed. (October 2015) (Learn how and when to remove this template message) Internet protocol suite Application layer BGP DHCP DNS FTP HTTP IMAP LDAP MGCP NNTP NTP POP ONC/RPC RTP RTSP RIP SIP https://en.wikipedia.org/wiki/Transport_layer SMTP SNMP SSH Telnet TLS/SSL XMPP more... Transport layer TCP UDP DCCP SCTP RSVP more... Internet layer IP IPv4 IPv6 ICMP ICMPv6 ECN IGMP IPsec more... Link layer ARP NDP OSPF Tunnels L2TP PPP MAC Ethernet DSL ISDN FDDI more... v t e In computer networking, the transport layer is a conceptual division of methods in the layered architecture of protocols in the network stack in the data link Internet Protocol Suite and the Open Systems Interconnection (OSI). The protocols of the layer provide host-to-host communication services for applications.[1] It provides services such as connection-oriented data stream support, reliability, flow control, and multiplexing. The details of implementation and semantics of the Transport Layer of the TCP/IP model (RFC 1122),[2] which is the foundation of the Internet, and the Open Systems Interconnection (OSI) model of general networking, are data link layer different. In the OSI model the transport layer is most often referred to as Layer 4 or L4, while numbered layers are not used in TCP/IP. The best-known transport protocol of TCP/IP is the Transmission Control Protocol (TCP), and lent its name to the title of the entire suite. It is used for connection-oriented transmissions, whereas the connectionless User Datagram Protocol (UDP) is used for simpler messaging transmissions. TCP is the more complex protocol, due to its stateful design incorporating reliable transmission and data stream services. Other prominent protocols in this group are the Datagram Congestion Control Protocol (DCCP) and the Stream Control Transmission Protocol (SCTP). OSI model by layer 7. Application layer NNTP SIP SSI DNS FTP Gopher HTTP NFS NTP SMPP SMTP SNMP Telnet DHCP Netconf more.... 6. Presentation layer MIME XDR 5. Session layer Named pipe NetBIOS SAP PPTP RTP SOCKS SPDY 4. Transport layer TCP UDP SCTP DCCP SPX 3. Network layer IP IPv4 IPv6 ICMP IPsec IGMP IPX AppleTalk X.25 PLP 2. Data link layer ATM ARP IS-IS SDLC HDLC CSLIP SLIP GFP PLIP IEEE 802.2 LLC MAC L2TP IEEE 802.3 Frame Relay ITU-T G.hn DLL PPP X.25LAPB Q.921 LAPD Q.922 LAPF 1. Physical

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