In this article I describe the TCP Transmission Control Protocol in computer network for CCNA exam. TCP Transmission Control Protocol is related to Transport layer of TCP/IP Suite model. The TCP Transmission Control Protocol provides the real time data transfer between different networking devices on a computer network . TCP Transmission Control Protocol provide the fast and reliable data transfer between different networking devices on a network or internet.
TCP Transmission Control Protocol allow the data packet transfer from one device to another like email without loss of any data packet. TCP Transmission Control Protocol take an acknolegement after sending each data packet. In case of failure of data packet received TCP allow to resend the missing data packets on the network. Routing and Routed Protocols provides the connectivity between different networks for data packets flow from one network to another network. A standard routing table is maintained by the routers for data packet flow between different networks.
Before going to learn about TCP Transmission Control Protocol we need to remember the OSI suite and TCP/IP suite model. There are many manufacturer of computer machine in the market. Initially when computers became single user public computer. The computers communicate with only same brand machines. It happens because there was no any fix standard for data transfer between different devices. It is very difficult to make communication with each other when the hardware are of different brands or company. In this article I describe the some basic part of OSI reference layer and TCP/IP Suite model basic concepts in networking with the TCP Transmission Control Protocol.
OSI reference model basic concepts
OSI reference model in computer network followed by various vendors to overcome the compatibility problem. After implementation of OSI reference model in computer network, equality maintains by all manufacturer. In 1970 the Open Systems Interconnection (OSI) reference model was created by the International Organization for Standardization (ISO). The OSI model was meant to create inter-operable network with different manufactured devices. In this article I describe some layered approach of TCP/IP Suite model basic concepts in computer network. Before understanding the TCP/IP Suite model basic concepts it is necessary to know about the 7 layers of OSI reference model because the basic work of each layer is described in the OSI reference model. You can read the full article related to OSI reference model in computer networking here.
Importance of OSI reference model for TCP Transmission Control Protocol
Before going to know about the TCP Transmission Control Protocol. It is necessary to know the function of layers in OSI model and TCP/IP model. Initially not only hardware but software also not supported for work the different computer brand. It became very difficult for all computer users to working without implementation of OSI reference model in computer network. It is necessary then to make some common protocols for all vendors of computer. Before implementation of OSI reference model in computer network, all vendors implements their own protocols on computer hardware and software.
In networking OSI reference model became helpful. OSI reference model describes the flow of data between nodes in any network. Data from one computer application to another computer application transfer by following some common protocols. The OSI reference layer also become beneficial for troubleshooting the network problems. TCP/IP and Cisco three layered hierarchical model of Cisco became more helpful alongside the OSI reference model.
The Layered Approach in computer network for TCP Transmission Control Protocol
The Layered approach was the best way to make equality for all computer devices. Layers are not physical but following some protocols. Protocols are for connectivity, connections, data transfer and more. All manufacturer begin to follow the layered approach for OSI reference model in computer network. The OSI reference model change in TCP/IP reference model and later on Cisco three layered hierarchical model. OSI layer architecture have 7 layers. TCP/IP reference model convert these 7 layers into only four layers. After that Cisco three layered hierarchical model converts these 7 layers into three layers. Some layers combined to work in a single layer.
OSI is acronym for open system interconnection. The OSI is a logical reference OSI reference model in computer network. OSI model helps for data flow between different devices and operating systems. All manufacturer used their own architecture before invention of OSI reference model. It was very difficult to establish data communication between different devices. To overcome this problem international organization for standardization (ISO) created the open systems interconnection (OSI) reference model. OSI reference model make data flow possible between different operating system, devices and hardware. Later the OSI model adopted by Cisco as Cisco three layered hierarchical model.
Structure of OSI reference model related to TCP Transmission Control Protocol
OSI reference model in computer network consist of 7 layers. These 7 layers further divided into two groups. First 3 layers works for application communication and remaining 4 layers works for data flow. Application, presentation and session layers define the application communication. Transport, network, data link and physical layers define the data flow. Networking protocols works only on last four layers.
TCP/IP Suite model basic concepts for XMPP Extensible Messaging Presence Protocol
TCP/IP is acronym for Transmission Control Protocol/Internet Protocol (TCP/IP suite model). In this section of the article I describe about TCP/IP suite model basic concepts in detail. TCP/IP suite model is a reference model like OSI layers. Instead of 7 layers of OSI reference model. TCP/IP suite model consist only four layer. All seven layers are merged into four layers only. TCP/IP suite model was designed and implemented by Department of Defence (DoD). TCP/IP developed to preserve data integrity.
The main purpose to develop the TCP/IP is to provide security in the network. A lots of protocols works on each layer to provide a secure network.
It is necessary to understood the protocols used in TCP/IP Suite model basic concepts. IP addressing play an important role in TCP/IP Suite model basic concepts. By using the IP address and subnet masking broadcast domain breaks. It will improve the performance of the network. Breaking broadcast domain increase the data flow speed. Here IP stands for IPV4 only. We ignore the IPV6 for some time in this article. It will make it easy to understand the TCP/IP Suite model basic concepts.
A snap of TCP/IP Suite model basic concepts
In the decade of 1970’s TCP/IP suite model developed by DoD. In the initial stage TCP/IP suite model divided into two segments TCP and IP. Later its name registered with combined name of TCP and IP like TCP/IP model. ARPA, the Advanced Research Projects Agency of DoD officially authorised to use TCP/IP suite model. TCP/IP model was working well so it was adopted by many organisations. In today scenario it is mostly using reference model for networking. Internet is the best example of using TCP/IP.
Process or Application layer of DoD model in TCP/IP Suite model
This is the first layer of TCP/IP of DoD model. It is combination of top three layers of OSI reference model. The functions of Application layer, presentation layer and session layer in OSI model works in single layer process layer. This layer supports the point to point communication and controls the user interface. The data encryption and decryption also done at this layer. Example of some protocols functions at this layer are TLS Transport Layer Security, FTP, LPD, TFTP, SMTP.
Transport layer of DoD model in TCP/IP Suite model
Transport layer of TCP/IP is same as the Transport layer of OSI reference model. It supports the TCP and UDP protocol. This protocol converts the main data segment into packets and transport to the internet layer. The responsibility of Transport layer is to combine the segments and built the data. The data should be reconstruct in its real form. Transport layer is also responsible for creating end-to-end communication between sender and receiver. This layer ensure the delivery of segment in sequence at the receiving device. This property maintains the data integrity.
Internet layer of DoD model in TCP/IP Suite model
Internet layer of TCP/IP is similar to the network layer of OSI reference model. Routing protocols functions on Internet layer of TCP/IP model. Addressing and filtering of packets is main responsibility of Internet layer of TCP/IP model. This layer provides the transmission of packet in the whole network. Some example of protocols functions on internet layer are ICMP, ARP and IP.
Link layer of DoD model in TCP/IP Suite model
Link layer is the least layer of TCP/IP. Basically link layer is combination of data link and physical layer of OSI reference model. Link layer is also known as Network Access layer. It works on MAC address based data transmission. Link layer handles the frame and bits. It receive the bits and constructs frame from merging bits in a sequence. In case of any bit is missing this layer request to re transmit the bits. Ethernet, FDDI, WAP etc functions on this layer. There is no any preset specification for link layer. Link layer functions on any type of existing media.
TCP Transmission Control Protocol explained in brief
TCP Transmission Control Protocol provides communication on internet between different devices. The TCP is basicaly provide the IP routing protocols via which a network device can send the data to another device on the internet. The TCP protocol is reliable and works on acknowledgement of data packet received on the network. Multiple checksum used when the data transmitted between different devices on the internet. Multiple protocols like handshake, SIP etc used for TCP protocol working.
TCP Transmission Control Protocol is a transport layer protocol in TCP/IP model. TCP provides data transmission between devices in a network. The TCP Transmission Control Protocol works on IP address system. TCP Transmission Control Protocol follow some rules to transport the data in a proper manner. The TCP is independent of software, hardware or media of devices in a network. TCP works on network layer in OSI model. Router configured to transport the data at network layer in OSI layer.
Data flow in the form of packets in a network on TCP Transmission Control Protocol. Source and destination defined by IP address system. TCP Transmission Control Protocol control the flow of data in a network. TCP protocol manage the reliability and accuracy of data transferred from one device to another device in a network. If data not transferred in accurate format, then the same data transmitted again from source to destination.
Purpose of TCP Transmission Control Protocol
There are billions of devices connected with each other in internet. At every instant a lot of data transmitted from one device to another device. data collision and lost happens on internet. The main purpose of Transmission Control Protocol is to achieve the reliability and accuracy of data. TCP follow some rule to maintain the data integrity and reliability.
TCP protocol is used where exact data required to send over internet. Email is the best example of TCP protocol transmission. Email never received in corrupted format. In received email no any letter or sentence missing because of TCP Transmission Control Protocol. Similarly, if you want to send a picture or video on internet, TCP protocol used for it. The data transmitted in the format of packet.
Function of Transmission Control Protocol
When a device need to send a data to another device on internet. Firstly, handshaking process done between sender and receiver devices. After getting acknowledgement from receiver, at sending device the data breaks into packets and packets align in a sequence. A unique sequence number and port number assigned to each packet. Port number defines the service for which the data transmitted.
Packets transmission begins according to sequence of packets. After a fix numbers of packets sender ask for acknowledgement. After getting acknowledgement next stream of packets sent to receiver. In case if acknowledgement not received same data re-transmitted again. This process is run till the complete data transmitted to receiver.
After receiving the complete data, the packets reassembled according to sequence or packets. A number provide the information for which the data received this number is known as port number. For example, web browsers used port 80 to access a website on http service. Port number is suffix with IP address to define the service for which data received. Another supported terms NAT and PAT used to distinct the data for all devices.
In this article I describe the TCP Transmission Control Protocol in computer network for CCNA Exam. I hope you found this article helpful for any query or suggestions you may drop a comment below or contact us. Your suggestions are always welcome by us.
