IT Interview Questions

What is UTP?

UTP — Unshielded twisted pair 10BASE-T is the preferred Ethernet medium of the 90s. It is based on a star topology and provides a number of advantages over coaxial media:

It uses inexpensive, readily available copper phone wire. UTP wire is much easier to install and debug than coax. UTP uses RG-45 connectors, which are cheap and reliable.

What is a router? What is a gateway?

Routers are machines that direct a packet through the maze of networks that stand between its source and destination. Normally a router is used for internal networks while a gateway acts a door for the packet to reach the ‘outside’ of the internal network

Question 1: 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.

Question 2: What is multiprogramming?

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

Question 3: 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.

Q1. Name of seven layers in Open System Interconnection model.

A. They are Application, Presentation, Session, Transport, Network, Data link, and Physical.

Q2. What is the time complexity of matrix multiplication ?

void Mult_Matrix(matrix A, matrix B, matrix C)
{
int i, j, k;
for ( i = 1; i < N; i++)
for ( j = 1; j < N; j++ )
{
C[i][j] = 0;
for ( k = 0; k < N; k++ )
C[i][j] = A[i][j]*B[k][j];
}
retrun;
}

A. The time comlexity of matrix mulitiplication is O(N^3)

Q: What are the seven layers of the OSI model?

A: The layers are physical, data link, network, transport, session, presentation, and application layers.

Q: In the TCP client-servel model, how does the three-way handshake work in opening connection?

A: The client first sends a packet with sequence “x” to the server. When the server receives this packet, the server will send back another packet with sequence “y”, acknowledging the request of the client. When the client receives the acknowledgement from the server, the client will then send an acknowledge back to the server for acknowledging that sequence “y” has been received.

1. You need to retrieve a file from the file server for your word processing application, which layer of the OSI model is responsible for this function?
   1. Presentation layer
   2. Application layer
   3. Session layer
   4. Transport layer
   5. Datalink layer
2. You are working in a word processing program, which is run from the file server. Your data comes back to you in an unintelligible manner. Which layer of the OSI model would you investigate?
   1. Application layer
   2. Presentation layer
   3. Session layer
   4. Network layer
   5. Datalink layer