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Osi And Tcp Essay

1007 words - 5 pages

The OSI and TCP/IP

The OSI model is an important part of providing network services over the Internet. This paper describes the seven different levels of the OSI model and the TCP/IP stack. Also, this paper will compare and contrast the main protocols being TCP and IP and the functions of each protocol. Also, this paper will discuss as to why the OSI model is important and why we still need the OSI model in today’s technological age of information exchange.
Application Layer
The Application Layer is number seven of the OSI model, which provides user interfaces that end-users are able to understand and interact through services, such as E-mail, FTP, Telnet, instant messaging software, ...view middle of the document...

• Provides error checking to ensure messages are error-free.
• Acknowledges successful transmissions and retransmission if data packets are missing or contain errors (Petri, 2009).
Network Layer
The network layer is the third layer of the OSI model, and it is where the IP or (Internet Protocols) reside, specifically the IP being the most popular of communication protocols has the job of addressing, transmitting data packets and performs routing between IP based networks. The specific functions of the IP protocol of the network layer are as follows:
1. Communicates with transport layer.
2. Encapsulates data packets with addressing for transmission.
3. Manages the connectivity and routing between hosts or networks (Petri, 2009).

Data link Layer
The data link layer is the second layer of the OSI model, and it that performs various functions depending upon the hardware protocol used. A few of the data link layers primary functions are as follows:
• Change packets into bits for delivery and when received changes bits back into packets.
• Ensures reliable transmission of data across the physical layer.
• The data link provides physical addressing, error detection, delivery of frames in orderly manner and manages flow control (Petri, 2009).
Physical Layer
The physical layer is the first layer, and it defines the electrical and physical specifications for devices within the OSI model, such as cables, connectors, hubs, repeaters, network adapters and more. The primary function of the physical layer is as follows:
• Responsible for transmitting the data over physical medium.
• Defines physical medium, such as connectors, cables, and hubs.
• Ensures NIC’s are attached to hardware and ensures the cables are attached to the NIC’s (Petri, 2009).
TCP/IP Protocol Stack
TCP/IP suite consists of multiple protocols. IP is the Internet protocol that is associated with network layer, which is used to move data between host computers. TCP is the Transmission Control Protocol associated with transport layer, which helps us to move data between applications. Since the TCP/IP provides a collection of...

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