TCP/IP model in Computer Network

An essential foundation for computer networking is the TCP/IP model. It stands for Transmission Control Protocol and Internet Protocol which are the two major Internet protocols. This model outlines the data transmission protocol over networks, guaranteeing reliable device-to-device communication. Its four layers are the Transport Layer, Internet Layer, link layer, and Application Layer. Understanding and utilizing contemporary networks requires understanding the distinct roles each layer plays in managing various facets of network communication.

The Department of Defense (DoD) created TCP/IP in the 1960s and it is based on accepted protocols. An abbreviated version of the OSI model is the TCP/IP model. It is different from the OSI model which contains seven layers but TCP/IP contains four layers.

Together with the development of the ARPANET which subsequently served as the basis for the current internet, the TCP/IP model was created. At the time it was created, the practical aspects of networking were the main focus. Higher-level networking protocols were mainly abstracted away from the physical transmission medium and lower-level hardware details.

What is the Function of TCP/IP?

The primary function of TCP/IP is to move computer data between devices. The primary requirement of this process is to ensure that the data is accurate and dependable so that the recipient receives the same information that was sent by the sender. The TCP/IP model separates data into packets and converges them at the other end to guarantee that each message reaches its destination precisely. This helps to maintain the precision of the data while it is being transferred from one point to the other. In the realistic world, where a variety of network technologies and physical media are in usage then the TCP/IP model is applied. Because the TCP/IP model does not specify a specific Physical Layer but it is flexible enough to accommodate various physical implementations.

What is the procedure of the TCP/IP model?

To ensure data accuracy, the TCP/IP model splits data into packets at the sender end and recombines those packets at the receiver end to create the same data whenever we want to send something using the internet. The data is divided into a 4-layer process by the TCP/IP model where it is first entered in one order and then rearranged in reverse order at the receiver end.

TCP/IP model

The TCP/IP model was developed by DARPA (Defense Advanced Research Projects Agency) in the 1970s. Therefore, the TCP/IP model is not the same as the OSI model. The original TCP/IP model has defined the four layers: Host-To-Network layer, Internet layer, Transport layer, and Application layer. But now it contains five layers Physical layer, Data link layer, Network layer, Transport layer, and Application layer.

Physical layer

The physical layer is the 1st layer of the TCP/IP. At the Physical layer, is communication between two nodes or hops. The physical layer at the TCP/IP supports all standard and established protocols. At this layer, the unit of the communication layer is a single bit.

Data-link layer

The data link layer is the 2nd layer of the TCP/IP. At the Data link layer, is communication between two nodes or hops. The Data-link layer at the TCP/IP supports all standard and established protocols. At this layer, the unit of communication is the frame.

Network layer

The network layer is the 3rd layer of the TCP/IP. This layer acts as the Network Layer of the OSI Model. The main feature of this layer is provided to connectionless communication in the network. The network layer at the TCP/IP model follows the internetworking protocol. Often defined as the network layer is known as the internet layer.

The common protocols used within the Network protocols

• Internetworking Protocol: The Internetworking Protocol (IP) is a mechanism used by TCP / IP for communication. Internetworking protocol is an unreliable protocol for best-effort delivery service. The phrasse best effort means that IP delivers no tracking or error checking. It is a connectionless protocol. At the Internetworking protocol, the data is transported in packet form which is called as the datagram. Each packet is transported separately.

• ARP (Address Resolution Protocol): Address Resolution Protocol is used to connect logical addresses to physical addresses. ARP protocol is used to detect the physical address of a node considered to have an IP address.

• RARP (Reverse Address Resolution Protocol): RARP is the opposite of ARP. The RARP allows a host to detect its IP address when it only knows its physical address. RARP is used when a computer is linked to a new network or when any diskless computer is booted.

• ICMP (Internet Control Message Protocol): The ICMP is a mechanism which sends the message to the sender about the query and error reporting. The hosts and gateways use it to transfer the information about the datagram problems back to the sender.

• IGMP (Internet Group Message Protocol): The IGMP is used to facilitate the transfer of the message to the group of the receiver at the same time.

Transport layer

The transport layer is the 4th layer of the TCP/IP. The transport layer at the TCP/IP model is accountable for handling end-to-end communications. The transport layer delivers three protocols which are SCTP, UDP, and TCP. The UDP and TCP are liable for the delivery of messages from one process to another process. The SCTP protocol was developed later to fulfil the requirements of further applications.

• UDP (User Datagram Protocol): UDP is a simple transport layer communication protocol. It is a connection-less protocol. When data transfer occurs, this protocol does not establish the connection between the sender and the receiver. UDP is an Unreliable Protocol.

• TCP (Transmission Control Protocol): TCP is a Connection-Oriented Protocol. When data transfer occurs, this protocol does establish the connection between the sender and the receiver. TCP is a reliable protocol.

• SCTP (Stream Control Transmission Protocol): SCTP is the combination of the best features of the TCP and UDP protocols. SCTP was introduced to support newer applications over the internet, such as video calling and voice messages.

Application layer

In the TCP/IP model, the application layer is equivalent to the combination of the session layer, presentation layer, and application layer in the OSI model. The application layer is related to providing network service to applications.

The common protocols used within the Application Layer are, such as Telnet, FTP, HTTP, SMTP, POP3, and NFS.

Conclusion:

TCP/IP model serves as the foundation for contemporary internet communication enabling dependable connections and information sharing between various networks and devices. Because of its adaptability scalability and broad use, it is crucial for networks of all sizes despite certain complexity and security issues. All things considered, efficient and successful network communication depends on the TCP/IP model.

FAQs:

1. Which IP addresses are compatible with TCP/IP?

 TCP/IP typically functions with both IPv4 and IPv6.

2. What is the number of layers in the TCP/IP model?

There are four layers in the TCP/IP Model.

• Application Layer
• Transport Layer
• Internet Layer
• Network Interface Layer

3. What differences exist between the OSI Model and the TCP/IP Model?

There are four layers in the TCP/IP Model compared to seven in the OSI Model. Since the TCP/IP Model is easier to understand and more useful, real-world networking uses it more frequently.

4. Which protocols make up the TCP/IP models?

The following are important protocols. Reliable data transmission is ensured by TCP (Transmission Control Protocol). Data packet routing and addressing are handled by IP (Internet Protocol). For accessing the information available online is done by HTTP/HTTPS. Transfer of files over the network is done by File Transfer Protocol (FTP). Email communication is done via SMTP (Simple Mail Transfer Protocol).

5. What function do IP addresses serve in the TCP/IP Model?

IP addresses permit data to be transmitted to the appropriate location by identifying devices on a network.