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Net Interview Questions And Answers
Page 1
Ques: 1
Define Network?
Ans:
The network is a set of devices which is connected by physical media links. A network recursively is a connection of two or more nodes by a physical link or two or more networks connected by one or more nodes.
Ques: 2 What is a Link?
Ans:
At the lowest level, a network can consist of two or more computers directly connected by some physical medium such as coaxial cable or optical fiber. Such a physical medium is called as Link.
Ques: 3 What is a node?
Ans:
A network can consist of two or more computers directly connected by some physical medium such as coaxial cable or optical, fiber cable. Such a physical medium is called as Links and the computer it connects is called as Nodes.
Ques: 4 What is a gateway or Router?
Ans:
A node that is connected to two or more networks is commonly called as router or Gateway. It generally forwards message from one network to another.
Ques: 5 What is point-point link?
Ans:
If the physical links are limited to a pair of nodes it is said to be point-point link.
Ques: 6 What are the advantages of Distributed Processing?
Ans:
1. Security
2.Encapsulation
3. Distributed database
4. Faster Problem solving
5. Security through redundancy
6. Collaborative Processing
Ques: 7 What are the criteria necessary for an effective and efficient network?
Ans:
a. Performance
It can be measured in many ways, including transmit time and response time.
b. Reliability
It is measured by frequency of failure, the time it takes a link to recover from a failure, and the network's robustness.
c. Security
Security issues includes protecting data from unauthorized access and virues.
Ques: 8 Define Bandwidth and Latency?
Ans:
Network performance is measured in Bandwidth (throughput) and Latency (Delay). Bandwidth of a network is given by the number of bits that can be transmitted over the network in a certain period of time. Latency corresponds to how long it t5akes a message to travel from one end off a network to the other. It is strictly measured in terms of time.
Ques: 9 What is a peer-peer process?
Ans:
The processes on each machine that communicate at a given layer are called peer-peer process.
Ques: 10 When a switch is said to be congested?
Ans:
It is possible that a switch receives packets faster than the shared link can accommodate and stores in its memory, for an extended period of time, then the switch will eventually run out of buffer space, and some packets will have to be dropped and in this state is said to congested state.
Ques: 11 What is semantic gap?
Ans:
Defining a useful channel involves both understanding the applications requirements and recognizing the limitations of the underlying technology. The gap between what applications expects and what the underlying technology can provide is called semantic gap.
Ques: 12 Define the terms Unicasting, Multiccasting and Broadcasting?
Ans:
If the message is sent from a source to a single destination node, it is called Unicasting.
If the message is sent to some subset of other nodes, it is called Multicasting.
If the message is sent to all the m nodes in the network it is called Broadcasting.
Ques: 13 What is Multiplexing?
Ans:
Multiplexing is the set of techniques that allows the simultaneous transmission of multiple signals across a single data link.
Ques: 14 What is FDM?
Ans:
FDM is an analog technique that can be applied when the bandwidth of a link is greater than the combined bandwidths of the signals to be transmitted.
Ques: 15 What is WDM?
Ans:
WDM is conceptually the same as FDM, except that the multiplexing and demultiplexing involve light signals transmitted through fiber optics channel.
Ques: 16 What is TDM?
Ans:
TDM is a digital process that can be applied when the data rate capacity of the transmission medium is greater than the data rate required by the sending and receiving devices.
Ques: 17 What is Synchronous TDM?
Ans:
In STDM, the multiplexer allocates exactly the same time slot to each device at all times, whether or not a device has anything to transmit.
Ques: 18 List the layers of OSI ?
Ans:
1. Physical Layer
2. Data Link Layer
3. Network Layer
4. Transport Layer
5. Session Layer
6. Presentation Layer
7. Application Layer
Ques: 19 Which layers are network support layers?
Ans:
1. Physical Layer
2. Data link Layer and
3. Network Layers
Ques: 20 Which layers are user support layers?
Ans:
1. Session Layer
2. Presentation Layer and
3. Application Layer
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Net Objective Questions And Answers
Net Interview Questions And Answers
Net Interview Questions And Answers
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