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TCP/IP Interview Questions

TCP/IP stands for transmission control protocol and Internet protocol. TCP/IP is considered to be the basic communication protocol of the Internet. In case of private network i.e. intranet or extranet, it can also be used as a communication language. These protocols are used for connecting the hosts to the Internet. They are built in the UNIX OS. The whole system of protocols is used by the Internet as a standard for the data transmission over networks. Those network OS with their own standard protocols also tend to support TCP/IP.

If you are done with the home work regarding TCP/IP and now need to get a general idea of what questions you would come across in your next interview, then the following guideline is the best for you. It has the most common TCP/IP interview questions along with their most probable answers. You would get a direction to prepare the best before you appear for the interview. Here are the most common TCP/IP interview questions:

Question 1: What do OSI and TCP/IP models stand for?

This is just a basic opening question to test your basic knowledge about the transmission control protocol and Internet protocol. Thus, keep this answer short and to the point. Do not waste much of your time here. OSI stands for open systems interconnection and TCP/IP model stands for transmission control protocol and Internet protocol.

Question 2: How many layers are there in TCP/IP? What are they?

There are total five layers of TCP/IP:

  • Network layer
  • Physical layer
  • Transport layer
  • Application layer
  • Internet layer

Question 3: Explain the three way handshake.

To answer this question, you should be first able to describe what it means by the handshaking process. Handshaking is an automated process of negotiation. In this process, the channels are physically established and then the normal information transfer takes place. In TCP/IP three way handshake, there are three messages that are transmitted by the TCP in order to negotiate. This starts a TCP session between two computers. Therefore, this type of handshake is also called as ' SYN-SYN-ACK' handshake, since the three messages are SYN, SYN-ACK, ACK. The main function of the three way handshake is to enable two computers trying to communicate with each other become able to negotiate the parameters of the network before the transmission of the data. Due to this handshake, both the ends become able to initiate as well as separate the TCP socket connections in both the directions simultaneously.

Question 4: What is the port number of Telnet and DNS?

The port number in telnet is 23 and it uses TCP. The port number in DNS (domain name system) is 53 and it uses TCP and UDP (user datagram protocol).

Question 5: How does the IP layer send data?

The protocol data unit of IP layer is packet and thus, it sends the data in the form of packets.

Question 6: What is the protocol data unit of the transport layer?

The protocol data unit of the transport layer is segment. Such a question can be asked regarding any layer. Therefore, read about the protocol data units of each layer.

Question 7: Tell me what functions are accomplished individually by TCP and IP in the TCP/IP model.

Like all other types of communication protocols, TCP/IP is also comprised of layers. IP serves to move the data packet from one node to another. Then each packet is forwarded depending on its IP number. The IP also operates on the gateway machines. TCP serves to confirm the delivery of the data from the client to the server. Since some of the data can be lost within the intermediating network, support by TCP is imparted in order to detect the errors and the lost data. Unless t5he complete and correct data is received, retransmission is triggered.

Question 8: What are two sub-layers of the data link layer?

This is a simple question and demands a brief answer. There are two sub-layers in the data link layer which are MAC (media access control) and LLC (logical link control). If asked, do elaborate more on these two sub-layers.

Question 9: What are sockets?

A socket is a representation of the end point of the communication. It is the combination of IP address and port number in the TCP/IP network. Some of the operations can be performed on the socket such as control operations, data transfer operations, initiation of a connection, data reading operations, and status operations.

Question 10: How many sub-divisions are there in the data link layer?

There are two sub-divisions of a data link layer. One is MAC layer (media access control) which serves to determine to whom the media is accessible to at one time. Second layer is LLC layer (logical link control). It is the uppermost sub-layer in the data link layer and it control and addressing of the data link. It also tends to offer flow control, error notification, and acknowledgment.

These are some of the generally asked questions during a TCP/IP interview. You might come across some more questions that need more extensive study. Therefore, try and think of as many possible questions as you can when you prepare for the interview. This would help you answer every question with confidence. Wish you good luck!.

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