Socket Programming Interview Preparation Guide
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Socket Programming Interview Questions and Answers will guide us now that in computing, network programming, essentially identical to socket programming or client-server programming, involves writing computer programs that communicate with other programs across a computer network. The program or process initiating the communication is called a client process, and the program waiting for the communication to be initiated is the server process. Learn Socket Programming with this Interview guide

62 Socket Programming Questions and Answers:

1 :: What Is Socket?

A socket is one end-point of a two-way communication link between two programs running on the network. Socket classes are used to represent the connection between a client program and a server program. The package provides two classes--Socket and ServerSocket--that implement the client side of the connection and the server side of the connection, respectively.

2 :: How does the race condition occur?

It occurs when two or more processes are reading or writing some shared data and the final result depends on who runs precisely when.

3 :: What is multiprogramming?

Multiprogramming is a rapid switching of the CPU back and forth between processes.

4 :: Name the seven layers of the OSI Model and describe them briefly?

Physical Layer - covers the physical interface between devices and the rules by which bits are passed from one to another.

Data Link Layer - attempts o make the physical link reliable and provides the means to activate, maintain, and deactivate the link.

Network Layer - provides for the transfer of information between end systems across

some sort communications network.

Transport Layer - provides a mechanism for the exchange of data between end system.

Session Layer - provides the mechanism for controlling the dialogue between applications in end systems.

Presentation Layer - defines the format of the data to be exchanged between applications and offers application programs a set of data transformation services.

Application Layer - provides a means for application programs to access the OSI environment.

5 :: What is the difference between TCP and UDP?

TCP and UDP are both transport-level protocols. TCP is designed to provide reliable

communication across a variety of reliable and unreliable networks and internets.

UDP provides a connectionless service for application-level procedures. Thus, UDP is basically an unreliable service; delivery and duplicate protection are not guareented.

6 :: What does a socket consists of?

The combination of an IP address and a port number is called a socket.

7 :: What is a JavaBean?

JavaBeans are reusable software components written in the Java programming language, designed to be manipulated visually by a software develpoment environment, like JBuilder or VisualAge for Java. They are similar to Microsoft’s ActiveX components, but designed to be platform-neutral, running anywhere there is a Java Virtual Machine (JVM).

8 :: What are the seven layers(OSI model) of networking?

2.Data Link,
6.Presentation and
7.Application Layers.

9 :: What are some advantages and disadvantages of Java Sockets?

Advantages of Java Sockets:
Sockets are flexible and sufficient. Efficient socket based programming can be easily implemented for general communications.

Sockets cause low network traffic. Unlike HTML forms and CGI scripts that generate and transfer whole web pages for each new request, Java applets can send only necessary updated information.

Disadvantages of Java Sockets:
Security restrictions are sometimes overbearing because a Java applet running in a Web browser is only able to establish connections to the machine where it came from, and to nowhere else on the network

Despite all of the useful and helpful Java features, Socket based communications allows only to send packets of raw data between applications. Both the client-side and server-side have to provide mechanisms to make the data useful in any way.

Since the data formats and protocols remain application specific, the re-use of socket based implementations is limited.

10 :: What is the difference between a NULL pointer and a void pointer?

A NULL pointer is a pointer of any type whose value is zero. A void pointer is a pointer to an object of an unknown type, and is guaranteed to have enough bits to hold a pointer to any object. A void pointer is not guaranteed to have enough bits to point to a function (though in general practice it does).