Which of the Following is a Data Link Protocol?

A data link protocol is a set of rules that govern the exchange of data between two devices on a network.

Data link protocols operate at the second layer of the Open Systems Interconnection (OSI) model, which is responsible for the physical and logical transmission of data.

They provide mechanisms for error detection and correction, flow control, and media access control.

Data Link Protocols

Here is a list of data link protocols:

1. Ethernet

Ethernet is the most widely used data link protocol in the world. It is a carrier sense multiple access with collision detection (CSMA/CD) protocol, which means that devices on an Ethernet network listen for traffic before transmitting. If two devices try to transmit at the same time, they will collide, and both will stop transmitting and try again after a random amount of time.

2. Token Ring

Token Ring is a data link protocol that uses a token to control access to the network. The token is a special frame that is passed from one device to the next. Only the device that has the token is allowed to transmit.

3. FDDI

FDDI (Fiber Distributed Data Interface) is a data link protocol that uses a fiber optic cable to transmit data. Fiber optic cable is immune to electromagnetic interference and can transmit data over longer distances than copper cable.

4. ATM

ATM (Asynchronous Transfer Mode) is a data link protocol that is designed for high-speed networks. ATM is a connection-oriented protocol, which means that a connection must be established between two devices before data can be transmitted.

5. HDLC

HDLC (High-Level Data Link Control) is a data link protocol that is used in wide area networks (WANs). HDLC is a bit-oriented protocol, which means that data is transmitted in bits rather than characters.

6. PPP

PPP (Point-to-Point Protocol) is a data link protocol that is used to connect two devices over a serial link. PPP is a simple protocol that is easy to implement.

Which of the following is a data link protocol?

• Ethernet
• TCP/IP
• HTTP
• FTP

Answer: Ethernet

Common Mistakes to Avoid

Here are some common mistakes to avoid when choosing a data link protocol:

• Not considering the speed of the network. Some data link protocols are faster than others. Choose a protocol that is appropriate for the speed of your network.
• Not considering the size of the network. Some data link protocols are more scalable than others. Choose a protocol that is appropriate for the size of your network.
• Not considering the type of traffic that will be transmitted on the network. Some data link protocols are better suited for certain types of traffic than others. Choose a protocol that is appropriate for the type of traffic that will be transmitted on your network.

Why Data Link Protocols Matter

Data link protocols are essential for the proper functioning of networks. They provide the mechanisms necessary for error detection and correction, flow control, and media access control. Without data link protocols, networks would not be able to operate efficiently.

Benefits of Data Link Protocols

Here are some of the benefits of using data link protocols:

• Increased reliability: Data link protocols help to ensure that data is transmitted reliably by detecting and correcting errors.
• Improved performance: Data link protocols help to improve network performance by controlling the flow of data and preventing collisions.
• Increased security: Data link protocols can help to improve network security by providing mechanisms for authentication and access control.

How Data Link Protocols Work

Data link protocols work by encapsulating data in frames. A frame is a unit of data that is transmitted over a network. Each frame contains the source and destination MAC addresses, the data, and a checksum. The checksum is used to detect errors in the data.

When a device receives a frame, it checks the checksum to make sure that the data is intact. If the checksum is correct, the device forwards the frame to the next device on the network. Otherwise, the device drops the frame and sends a request for the data to be retransmitted.

Data Link Protocol Standards

There are a number of standards that define data link protocols. The most common standards are the IEEE 802.3 standard for Ethernet and the ITU-T G.hn standard for home networking.

Conclusion

Data link protocols are an essential part of networks. They provide the mechanisms necessary for error detection and correction, flow control, and media access control. By choosing the right data link protocol, you can improve the performance, reliability, and security of your network.

Interesting Stories

Here are three interesting stories about data link protocols:

1. The Story of the Ethernet

The Ethernet protocol was invented by Robert Metcalfe in the early 1970s. Metcalfe was a researcher at Xerox PARC, and he was looking for a way to connect multiple computers together so that they could share data.

Metcalfe's original Ethernet protocol was a simple CSMA/CD protocol. It worked by having devices on the network listen for traffic before transmitting. If two devices tried to transmit at the same time, they would collide, and both would stop transmitting and try again after a random amount of time.

The Ethernet protocol was a huge success, and it quickly became the most widely used data link protocol in the world.

**Today, Ethernet is used in a wide variety of applications, from home networks to enterprise networks.**

2. The Story of the Token Ring

The Token Ring protocol was invented by IBM in the early 1980s. Token Ring was a token-passing protocol, which means that devices on the network passed a token to each other in order to transmit data.

Only the device that had the token was allowed to transmit.

**This prevented collisions from occurring, and it made Token Ring a very reliable protocol.**

Token Ring was a popular protocol in the 1980s and 1990s, but it has since been replaced by Ethernet as the most widely used data link protocol.

3. The Story of the FDDI

The FDDI protocol was invented by ANSI in the early 1990s. FDDI was a fiber optic protocol, which means that it used fiber optic cable to transmit data.

Fiber optic cable is immune to electromagnetic interference and can transmit data over longer distances than copper cable.

**This made FDDI a very popular protocol for high-speed networks.**

FDDI was a popular protocol in the 1990s and early 2000s, but it has since been replaced by Ethernet as the most widely used data link protocol for high-speed networks.

What We Can Learn from These Stories

These stories teach us several important lessons about data link protocols:

• Innovation is important. The Ethernet, Token Ring, and FDDI protocols were all invented by researchers who were looking for new ways to connect computers together.
• Standards are important. The IEEE 802.3 standard for Ethernet and the ITU-T G.hn standard for home networking have helped to ensure that data link protocols are interoperable.
• Technology changes. The Ethernet protocol has been around for over 40 years, but it has constantly evolved to meet the needs of new applications.

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Data Link Protocol Table

The following table provides a summary of the most common data link protocols:

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Data Link Protocol Market

The data link protocol market is a large and growing market. In 2020, the market was valued at $10.2 billion. The market is expected to grow to $15.3 billion by 2025.

The growth of the market is being driven by the increasing demand for high-speed networks. As more and more devices are connected to the Internet, the need for faster and more reliable networks is increasing.

The market is also being driven by the growing popularity of cloud computing. Cloud computing requires high-speed networks to connect users to cloud-based applications and services.

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