Data link layer< - CompWisdom

Data link layer< - CompWisdom

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Datab> linkb> layer - Wikipedia, the free encyclopedia

The datab> linkb> layer is often implemented in software as a "network card driver".
The datab> linkb> layer provides the functional and procedural means to transfer datab> between network entities and might provide the means to detect and possibly correct errors that may occur in the Physical layer.
Other datab> linkb> layer protocols, such as HDLC, are specified to include both sublayers, although some other protocols, such as Cisco HDLC, use HDLC's low-level framing as a MAC layer in combination with a different LLC layer.

http://en.wikipedia.org/wiki/Data_link_layer (701 words)



NOAAPORT Datab> Linkb> Layer Protocol

The NBS encodes the datab> using nonreturn-to-zero (NRZ) encoding.
With this encoding method, only a minimal amount of clocking information is available in the datab> stream in the form of transitions on bit-cell boundaries, which do not allow for self-clocking.
This field contains the datab> packet that is further defined in the SBN protocol.

http://www.nws.noaa.gov/noaaport/html/datalink.shtml (419 words)



CCNA Study Notes - OSI - Datab> Linkb> Layer

The Datab> Linkb> layer uses a calculated value called the CRC (Cyclic Redundancy Check) that's placed into the Datab> Linkb> trailer that's added to the message frame before it's sent to the Physical layer.
Packets and datagrams are converted into frames and the Datab> Linkb> header is added.
Error notification alerts upper layer protocols that a transmission error has occurred, and the sequencing of datab> frames reorders frames that are transmitted out of sequence.

http://defoenet.com/ccna/osi_l2.html (1380 words)



Datab> Linkb> Layer

Datab> linkb> layer algorithms may be embedded in the network hardware (rather than running as software process on a machine).
Datab> linkb> layer sends frames - small fixed (or max) length pieces of datab>.
Assume a single linkb> from A to B. Assume service provided by physical layer is that it will deliver bits to B in the order in which they are sent.

http://www.compapp.dcu.ie/~humphrys/Notes/Networks/data.link.html (1931 words)



The Datab> Linkb> Layer Protocols

The purpose of the datab> linkb> layer is to transfer blocks of datab> without error between two adjacent devices.
The primary station is responsible for the organisation of datab> flow and for the linkb> level error recovery procedures.
The implication of such a physical linkb> is that the datab> bits are delivered in exactly the same order in which they are sent.

http://www.dsi.unive.it/~franz/reti/dll/Protocolli.html (4436 words)



Datab> Linkb> Layer Processing © AA VERSTRAETE

The datab> linkb> is the last layer in the protocol suite that treats the datab> as a logical datab> string held in the computer's main memory and processed by the communication's software.
The datab> linkb> layer takes posession of the protocol datab> unit that has been received by the datab> communications equipment [DCE] operating at the physical layer.
Peer-to-peer dialogue (dotted line): The sending and receiving datab> linkb> layers confirm any transmission protocol conventions that may be required to transfer the message to the next network node.

http://www.smeal.psu.edu/misweb/datacomm/ID/OSI_RDL.HTM (207 words)



The DataLink Layer

Example datab> structures and library routines required for datab> linkb> layer
The overall task of the datab> linkb> layer is to make the physical line appear error free to the higher layers (this is usually called a virtual circuit).
The host computers past datab> to/from the IMPS (interface message processors) which handle the communications over the physical communications linkb>.

http://www.cse.dmu.ac.uk/~cfi/Networks/DataLink/DataLink0.htm (206 words)



PC Hardware reviews, overclocking, news - Master a network: Layer II 1/5

The Datab> Linkb> Layer deals with problems such as hardware addresses, network topologies and how computers on a network access the shared medium.
I've stated earlier that the Datab> Linkb> Layer is where the network topology is defined.
There are actually two aspects of a network's topology: the physical topology (the actual layout of the wires) and the logical topology (how datab> flows in a network).

http://www.pchardware.ro/Articles/article.php?id=124 (521 words)



The Datab> Linkb> Layer

Layer 2, the Datab> Linkb> layer, is where Ethernet lives.
The capability to send datab> to only the correct host was a huge advance in switching because collisions became much less likely.
Abbreviated STP, a linkb> management protocol that is part of the IEEE 802.1 standard for media access control bridges.

http://www.webopedia.com/DidYouKnow/Computer_Science/2006/data_link_layer.asp (1358 words)



Datab>-Linkb> Layer

The datab>-linkb> layer provides error-free transfer of datab> frames from one computer to another over the physical layer.
Establishment and termination of logical links (virtual-circuit connection) between two computers identified by their unique network adapter addresses.
Instead, reliable datab> delivery is provided by protocols operating at the transport layer.

http://www.microsoft.com/resources/documentation/Windows/2000/server/reskit/en-us/cnet/cnfh_osi_ltkh.asp?frame=true (217 words)



LAN Datab> Linkb> Layer Protocols - CIF Ethernet FDDI GARP GMRP GVRP LLC Multiprotocol over ATM SNAP SRP MAC Protocol Token Ring VLAN

The Datab> Linkb> Layer defines how datab> is formatted for transmission and how access to the network is controlled.
IP datagrams are sent on IEEE 802 networks encapsulated within the 802.2 LLC and SNAP datab> linkb> layers and the 802.3, 802.4 or 802.5 physical network layers.
Ethernet is a widely used datab> communications network standard developed by DEC, Intel, and Xerox.

http://www.protocols.com/pbook/lan.htm (1957 words)



The Datab> Linkb> Layer

The main task of the datab> linkb> layer is to take a raw transmission facility and transform it into a line that appears free of transmission errors in the network layer.
Since the physical layer merely accepts and transmits a stream of bits without any regard to meaning of structure, it is up to the datab> linkb> layer to create and recognize frame boundaries.
Another issue that arises in the datab> linkb> layer (and most of the higher layers as well) is how to keep a fast transmitter from drowning a slow receiver in datab>.

http://www2.rad.com/networks/1994/osi/datalink.htm (268 words)



Datab> Linkb> Layer

All encapsulated datab> plus the datab> linkb> information
SAP’s move datab> from one layer to the next and to the correct application
Datab> Linkb> repackages the frame to fit the protocol requirement

http://www.brazosport.cc.tx.us/~slannen/netess/chap6 (710 words)



Chapter 6: Datab> Linkb> Layer

The datab> linkb> layer manages point to point communication and frames datab> for the physical layer to send over the media.
The Media Access Control (MAC) sublayer handles coordination of and contention for use of the media (particularly important in shared media situations), while the Logical Linkb> Control (LLC) layer is an interface between MAC and the network layer (layer 3).
Error detection is performed by adding additional information to the datab> which might allow the receiver to recognize an error.

http://telecomm.boisestate.edu/is380.f97/datalink.htm (453 words)



Datab> Linkb> Layer Components

The datab> linkb> layer consists of drivers that directly handle communication with the physical medium.
The PPP linkb> can serve as an additional network interface apart from the existing default network interface, or it can be the default network interface on the target, causing PPP to serve as a network back end for the target server on the host.
To prevent more than one processor from simultaneously accessing certain critical datab> structures of the shared-memory pool, the model uses an indivisible test-and-set instruction to obtain exclusive use of a shared-memory datab> structure.

http://www.ia.agh.edu.pl/personal/pszwed/kss-lab/wind-docs/vxworks/netguide/c-dll.html (8027 words)



Datab>-Linkb> Layer - 2

Builds on the transmission facility provided by the physical layer to transform it into a linkb> that appears to the network layer above to be free of transmission errors.
Concerned with the transmission of datab> between two directly connected devices across a single linkb>.
Datab> has to be free of all errors to be useful.

http://www.eeng.dcu.ie/~murphyj/tc2/dc2000/tsld018.htm (72 words)



Chapter 7: The OSI Datab>-Linkb> Layer

Identify the characteristics of the three transmission synchronization techniques that can be used at the Datab> Linkb> layer.
This layer tells us how the network is physically accessed, how some errors are handled, how datab> flow is handled and how entities on the network are addressed.
It is not the best for time sensitive datab> since waits are built in, but it will support more devices than contention.

http://home.att.net/~s.k.vincent/250_7.htm (1488 words)



NETBOOK - Q & A on Datab> Linkb> Layer in OSI

Q: The Datab> Linkb> layer of the OSI model is sometimes subdivided into a media access control (MAC) and a logical linkb> control (LLC) layer.
A network analyzer can tell from the values in the type field (small values are lengths, which mean an LLC/SNAP header is located in the first octets of the datab> area; large values are types, which mean no LLC/SNAP header is included).
For example, in X.25, a linkb> layer frame includes a sequence number, and the receiver must acknowledge each frame.

http://www.netbook.cs.purdue.edu/othrpags/qanda114.htm (242 words)



Datab> Linkb> Layer Protocols

The remote Network Layer peer should receive the identical message generated by the sender (e.g., if the datab> linkb> layer adds control information, the header information must be removed before the message is passed to the Network Layer).
Nonetheless, the ISO reference model suggests that the datab> linkb> layer provide such a service, and we now examine the protocols that provide such a service.
Consists of datab> plus control bits (header information).

http://www.cs.wpi.edu/~cs4514/b98/week3-dllprot/week3-dllprot.html (1228 words)



Webopedia: The 7 Layers of the OSI Model

This layer provides switching and routing technologies, creating logical paths, known as virtual circuits, for transmitting datab> from node to node.
The datab> linkb> layer is divided into two sublayers: The Media Access Control (MAC) layer and the Logical Linkb> Control (LLC) layer.
This layer provides transparent transfer of datab> between end systems, or hosts, and is responsible for end-to-end error recovery and flow control.

http://www.webopedia.com/quick_ref/OSI_Layers.asp (426 words)



ISA General Information

This technical report acts as a tutorial addressing those who are not familiar with ISA's Fieldbus Datab> Linkb> Layer (DLL) documents.
links separate parts of the ISA DLL documents relevant to either the same subject or to correlated items; and
However, datab> highway and other time-shared transmission paths, such as those within the scope of SP72, are excluded.

http://www.isa.org/?template=Ecommerce/ProductDisplay.cfm&ProductID=2613 (336 words)



Datab> linkb> layer

When the frame arrives the destination machine, it computes the check sum again if the newly computed checksum is different from the old one an error has been occured and the datab> linkb> layer takes necessary steps to deal with it.
Datab> linkb> layer has several functions to perform they are providing a well defined service to the network layer, determining how the bits of the physical layer are grouped into frames, dealing with transmission errors, regulating the flow of frames so that slow receivers are not swamped by fast senders, and general linkb> management.
The principal service provided by the datab> linkb> layer to the network layer is the transmission of datab> from the source network layer to destination network layer.

http://homepages.uel.ac.uk/u0214590/data.html (548 words)



Role of the Datab>-linkb> layer

The Datab>-linkb> layer in the receiver extracts the datab> and passes the datab> to its Network layer.
An important function of the Datab>-linkb> layer is the establishment of reliable and efficient communication with another Datab>-linkb> layer peer.
buffering and copying the received datab> to a disk file) to accommodate the rate at which the sender is sending the datab>.

http://www.cs.mu.oz.au/353/notes/node53.html (199 words)



ITPRC - Datab> Linkb>

Ryan's Gigabit Network and Distributed Computing Home Page - Collection of links to research projects on gigabit networking
Gigabit Ethernet Links Page - IEEE's links to Gigabit Ethernet Information
FDDI- System Level Description - A detailed white paper on FDDI technology

http://www.itprc.com/datalink.htm (376 words)



Datab> Linkb> Layer and IEEE

RFC 1042 defines the IP to linkb> layer datab> encapsulation for networks using the IEEE 802 standards.
The network media is the physical means of carrying the datab> such as network cable.
The ethernet standard datab> encapsulation method is defined by RFC 894.

http://www.comptechdoc.org/independent/networking/guide/netieee.html (1039 words)



OSI Model - Datab> Linkb> Layer

The datab> linkb> layer performs various functions depending upon the hardware protocol used, but has four primary functions:
The CSMA/CD protocol that Ethernet uses to control access to the common network bus could be said to occur at the datab> linkb> layer of the OSI model or could also be called a datab> linkb> function.
The datab> linkb> Layer is the second layer of the OSI model.

http://www.inetdaemon.com/tutorials/theory/osi/data_link.shtml (281 words)



Define datab> linkb> layer - a definition from Whatis.com

The Datab>-Linkb> Layer is the protocol layer in a program that handles the moving of datab> in and out across a physical linkb> in a network.
The Datab>-Linkb> Layer is layer 2 in the Open Systems Interconnect (OSI) model for a set of telecommunication protocols.
The Datab>-Linkb> Layer assures that an initial connection has been set up, divides output datab> into datab> frames, and handles the acknowledgements from a receiver that the datab> arrived successfully.

http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci211971,00.html (200 words)



Configuring Datab> Linkb> Layer Interfaces

The HDLC layer is on top of the physical layer and can support flexible assignment of physical resources.
For Frame Relay, the physical layer can be CE1, E3, CT1, T3, or a fractional service, as supported by the different line module ports.
Figure 1-13 shows the structure of the Frame Relay protocols with the physical layer as the foundation.

http://www.juniper.net/techpubs/software/erx/erx403/swconfig-system-basics/html/network-planning10.html (947 words)



Networking Technology - Questy's study guide

The lower sub-layer of the Datab> Linkb> layer, the Media Access Control (MAC), performs Datab> Linkb> layer functions related to the Physical layer, such as controlling access and encoding datab> into a valid signaling format.
The Datab> Linkb> layer deals with issues on a single segment of the network, the Network layer deals with issues spanning networks.
The upper sub-layer of the Datab> Linkb> layer, the Logical Linkb> Control (LLC), performs Datab> Linkb> layer functions related to the Network layer, such as providing and maintaining the linkb> to the network.

http://www.computerguru.net/tech/netw31.htm (532 words)



Datab> Linkb> Layer

Layer(DLC--Datab> Linkb> Control) originates from this) for the connection must be managed
SYN SYN Count(2 bytes) datab> characters …….. error detect codes
 -To achieve Datab> Transparency, stuff 0 after every 5 consecutive 1's

http://www.ecst.csuchico.edu/~sim/278/notes/NOTE9_1.htm (911 words)

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Topic: Data link <b>layer<

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