Main Functionalities of the Data Link Layer in Computer Networks Essay

Main Functionalities of the Data Link Layer in Computer Networks Essay

Length: 1317 words (3.8 double-spaced pages)

Rating: Strong Essays

Open Document

Essay Preview

Introduction
In the OSI model of computer networking, the data link layer is layer two of seven and corresponds to the host-to-network layer of the TCP/IP reference model. Its main aim is to reliably transfer data between two adjacent machines whilst efficiently detecting and correcting errors in transmission. Packets from the network layer are packed into frames and transferred to the network layer on another machine. Data link layer protocols respond to the network layer and issue requests to the physical layer. The data link layer in LANs can contain Media Access Control and Logical Link Control sub-layers.
Unacknowledged connectionless service can be offered by the data link layer. It is used in LANs and other reliable mediums or real-time traffic situations. No connection is established when the source machine sends individual frames to a machine, frames are not acknowledged.
Acknowledged connectionless service works on the same principles as unacknowledged connectionless service except each individual frame is acknowledged on reception. It is used on unreliable media such as wireless.
Acknowledged connection-oriented service is also provided by the data link layer, data is sent and acknowledged. The data link establishes a connection to send data then releases it once the data has been successfully sent.

Framing
In order to transfer data between layers, a bitstream is split into frames containing the frames source and destination information. Errors can occur during transmission of frames which are rectified using a suitable protocol. Frames are transferred between LAN devices by the data link layer. A frame contains a header which includes the source and destination address of the frame. Frames are delivered using...


... middle of paper ...


...evel messages into frames. Sent data needs to be checked for errors when using some protocols and the data link layer monitors and corrects errors that occur on lower levels of the network.



Works Cited

Carter, N. (2009). What is layer 2 and why should you care?. Available: http://www.accel-networks.com/blog/index.php?q=/2009/09/what-is-layer-2-and-why-should-you-care.htm. Last accessed 23 March 2010.
Kozierok, C M. (2005). Data link layer (layer 2). Available: http://www.tcpipguide.com/free/t_DataLinkLayerLayer2.htm. Last accessed 18 March 2010.
whatIs.com. (2009). Data link layer. Available: http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci211899,00.html . Last accessed 20 March 2010.
Yang, S (2009). CO2017 lecture notes. Leicester: University of Leicester. 53-63.
Yang, S (2009). CO2017 lecture slides. Leicester: University of Leicester. 57-74.

Need Writing Help?

Get feedback on grammar, clarity, concision and logic instantly.

Check your paper »

Computer Science: Data Mining Essay

- Data mining is an analytic process of exploring huge amount of data, extract useful information, finding consistent patterns and trends between variables, and build predictive computer models from the relationship discovered using a combination of classical statistics, machine learning and artificial intelligence. The findings are then applied to new subsets of data to test its validity. It performs two essential tasks, descripting and predicting. Descriptive mining tasks characterize the general properties of the data in database....   [tags: exploring data, prediction, validity]

Strong Essays
1518 words (4.3 pages)

The Computer Of A Computer Essay

- The computer, one of man’s smartest inventions ever constructed. A device that was once a near thousands pounds, cost over a million dollars now fits into the palm of a hand and is only a fraction of the cost. Over a century ago, people had to accomplish routine tasks manually. Hand writing letters, scouring terms in the dictionary, and interacting with people face to face are functions that were once a norm for everyone but now are obsolete. In this automatonic, simplistic world we live in, objectives can be completed in fractions of the time it took over a hundred years ago, all thanks to the computer....   [tags: Konrad Zuse, Computer, Computer data storage]

Strong Essays
732 words (2.1 pages)

Computer Forensics And Digital Data Essay

- computer, ranging from child pornography to data interception and theft. An investigator needs to ensure that the appropriate tools are utilized (US-Cert, 2008). There are several reasons as to why the appropriate tools must be utilized by investigators. Some of these reasons involve the deletion, damaging, or encryption of files. To prevent further damages as they seek to recover these files, the investigator must be knowledgeable of the array of methods and software available. There are two essential types data collected in computer forensics and the bulk of this exploratory research was devoted to data, cybersecurity, and cybercrimes as it relates to computer forensics and digital data....   [tags: Computer security, Information security, Security]

Strong Essays
854 words (2.4 pages)

The Components Of A Computer Essay examples

- The three main components of a computer are as followed: Central Processing Unit (CPU),Primary Storage (Main Memory) ,and Secondary Storage (Secondary Memory). The first component of the computer is the Central Processing Unit or known as the CPU. The CPU manipulates the data and controls the tasks performed by the other components. The CPU sequentially access programs instructions, decode them, and controls the flow of date to and from the ALU; the ALU is the Arithmetic-logic unit (this performs mathematics calculations and make logical comparisons)....   [tags: Computer data storage, Computer]

Strong Essays
1324 words (3.8 pages)

Essay on Annotated Bibliography On Computer Memory Hacking

- Computer Memory Hacking Pamela Riddle Professor Patricia Riley CIS 106 November 20, 2014 Technology continues to evolve exponentially. However these technological advancements continue to pose a threat to both individuals and information resources of companies and governments. There is therefore the need to protect one’s data and information due to the emerging threats and risks. Hacking is where third parties create a backdoor version of a hardware and software so as to manipulate or unlock hidden functionalities on a machine....   [tags: Computer data storage, Computer, Malware]

Strong Essays
902 words (2.6 pages)

Backing Up Data on Your Computer Essay

- Backing up your data is essential in securing your files from being lost or destroyed. It can also be a great way to install your pictures and videos onto another computer. Luckily, now a days, purchasing a storage device is easier than ever. They are available online, as well as through many major retailers. The price is usually reasonable and is determined by the amount of data that you need to store. The Benefits of a Data Backup Device - Losing your memories and files can be heart wrenching to encounter....   [tags: Computers]

Strong Essays
543 words (1.6 pages)

Computer Data Security Essay

- Every business from the small auto shop in our neighborhood to a big national corporations are worried about the same thing, keeping sensitive data safe, either by storing the physical paper work in a secure room or by strengthening computer security measures. Data needs to be handling with care and monitored all the time to make sure that the integrity of files has not been corrupted. Plus, data collected and stored in serves needs to be protected from any type of disaster either physically or electronically....   [tags: Computers]

Strong Essays
797 words (2.3 pages)

Data Link Control (internet) Essay

- Society has become based solely on the ability to move large amounts of information across vast distances quickly. The natural evolution of computers and this need for ultra-fast communications has caused a global network of interconnected computers to develop. This global network allows a person to send E-mail across the world in mere fractions of a second, and enables even the common person to access information world-wide. With the new advancements in technology there must be a set of “rules” or better known as protocols that must be established and utilized at all times....   [tags: essays research papers]

Free Essays
2656 words (7.6 pages)

Data Acquisition Essay

- Data Acquisition Data acquisition is the process of copying data. For computer forensics, it’s the task of collecting digital evidence from electronic media. There are two types of data acquisition: static acquisitions and live acquisitions. Static Acquisitions: if you have preserved the original media, making a second static acquisition should produce the same results. The data on the original disk is not altered, no matter how many times an acquisition is done. Your goal when acquiring data for a static acquisition is to preserve the digital evidence....   [tags: copying data, computer forensics]

Strong Essays
1744 words (5 pages)

Accuracy Of Data Essay

- In today's society, the collection and dissemination of information by means of computer technology is increasing every day. The accuracy of the data is extremely important which is why it is necessary to choose the correct method to precisely process the information that is input as well as create consistent information that is extracted. In order to determine the best method, it is necessary to understand the primary functions of the various types of data and hardware. Printed questionnaires are best computed by Optical Readers....   [tags: Computer Data Accuracy]

Free Essays
914 words (2.6 pages)