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be challenged and removed. (June 2013) (Learn how and when to remove this template message) OSI model by layer 7. Application layer NNTP SIP SSI DNS FTP Gopher HTTP NFS NTP data link layer functions SMPP SMTP SNMP Telnet DHCP Netconf more.... 6. Presentation layer MIME XDR 5.

Data Link Layer Protocols

Session layer Named pipe NetBIOS SAP PPTP RTP SOCKS SPDY 4. Transport layer TCP UDP SCTP DCCP SPX 3.

Data Link Layer Ppt

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

Data Link Layer Devices

802.3 Frame Relay ITU-T G.hn DLL PPP X.25LAPB Q.921 LAPD Q.922 LAPF 1. Physical layer EIA/TIA-232 EIA/TIA-449 ITU-T V-Series I.430 I.431 PDH SONET/SDH PON OTN DSL IEEE 802.3 IEEE 802.11 IEEE 802.15 IEEE 802.16 IEEE 1394 ITU-T G.hn PHY USB Bluetooth RS-232 RS-449 v t e The data link layer or layer 2 is the second layer of the seven-layer OSI model of computer data link layer framing networking. This layer is the protocol layer that transfers data between adjacent network nodes in a wide area network (WAN) or between nodes on the same local area network (LAN) segment.[1] The data link layer provides the functional and procedural means to transfer data between network entities and might provide the means to detect and possibly correct errors that may occur in the physical layer. The data link layer is concerned with local delivery of frames between devices on the same LAN. Data-link frames, as these protocol data units are called, do not cross the boundaries of a local network. Inter-network routing and global addressing are higher-layer functions, allowing data-link protocols to focus on local delivery, addressing, and media arbitration. This way, the data link layer is analogous to a neighborhood traffic cop; it endeavors to arbitrate between parties contending for access to a medium, without concern for their ultimate destination. When devices attempt to use a medium simultaneously, frame collisions occur. Data-link protocols specify how devices detect and recover from such collisions, and may provide mechanisms to reduce or prevent them. Examples of data link protocols are

(Русский)ישראל (עברית)المملكة العربية السعودية (العربية)ไทย (ไทย)대한민국 (한국어)中华人民共和国 (中文)台灣 (中文)日本 (日本語)  HomeLibraryLearnDownloadsTroubleshootingCommunityForums Ask a question Quick access Forums home Browse forums users FAQ Search related threads Remove From My Forums Asked by: Microsoft Data data link layer design issues Link Error - Connection failure SQL Server > SQL Server Express data link layer protocols pdf Question 0 Sign in to vote Hi!I've a computer with W2K SP4 installed. Previously SQL Express network layer in osi model 2005 worked but according to the user it "just stopped working".When selecting database on the server in the "Data Link Properties"-window he is given the following https://en.wikipedia.org/wiki/Data_link_layer error message:"Microsoft Data Link" "Login failed. Catalog information cannot be retrieved" followed by"Microsoft Data Link Error" "Connection failure"Note: He is not given the error message "Server does not exist or access denied!"- The SQL service is started (can be stopped and restarted without problem)- I've re-installed SQL Express.- I've checked and is certain the https://social.msdn.microsoft.com/Forums/sqlserver/en-US/4cc84721-87e4-46ee-a9b0-e336865b0943/microsoft-data-link-error-connection-failure?forum=sqlexpress server name is correct (i.e. computername\SQLEXPRESS)Any ideas here because I'm getting desperate? Thanks in advance, Peter Hartlén Monday, April 21, 2008 4:23 PM Reply | Quote All replies 0 Sign in to vote As this is a named instance assure that the sqlbroswer service is running.  This is required for connectivity to a named instance and to use the DAC remotely, locally will work even if the service is stopped.     Monday, April 21, 2008 5:56 PM Reply | Quote Moderator 0 Sign in to vote Thanks for you reply David.I will have a look at the sqlbrowser issue. This is however a standard installation that usually works "out-of-the-box". Is it more common that a Win2k computer show these kind of problems than XP-installations? I've never seen it before, and I probably have 40+ installations out there.Are there any data connection drivers I could re-install? MDAC?Unfortunately I don't have direct access to the computer and the person u

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 85w ago · Upvoted 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 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 https://www.cedarville.edu/help/AppScan-Questions-about-Row-and-Column-Error-Messages 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 data link 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 data link layer 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 do we do error checking at both the TCP layer as well as the data link layer through Checksum and CRC respectively?What is the difference between transport layer and datalink layer?Why does UDP have an error control field when it only provides unreliable services?Many features of the transport layer (e.g. flow control and reliable delivery) are also handled by the data link layer. Is this duplication of... Kishan Kumar, studentWritten 9w agoProviding error control at the link layer is an optimization , never a requirement .The transport layer can always send a message and wait for it to be acknowledged by its

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