Basic CS [3i Infotech Placement]: Sample Questions 149 - 150 of 243

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Question 149

Basic CS
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Describe in Detail

Essay▾

Difference between the communication and transmission.

Explanation

Difference between the Communication and Transmission
CommunicationTransmission
The entire process of sending and receiving data using data cable connected externally.The transfer of data from the source to the destination.
Full exchange of information between two communication media.Physical movement of information.
Concerned with media of communication, noise, signal strength etc.Concerned with issues like bit polarity, synchronisation, clock etc.
Full dialogue between the source and destination is communicationOnly concerned with physical movement of information- transmitting of data to the destination.
A two-way interactive process in which all the participants actively share their data.One way data transfer

Question 150

Basic CS
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Describe in Detail

Essay▾

What is packet filter?

Explanation

Understanding of Packet Filtering
  • Packet filter is a firewall used to control network access by monitoring outgoing packets.
  • The header of each packet is analysed based on a specific rules- preventing it from passing (filtering) .
  • Filters income packets allowing them to pass based on destination IP, address, protocol.
  • Also known as static filtering.
  • Used conjunction with packet mangling and Network Address Translation.
  • Often part of a firewall program for protecting a local network from unwanted intrusion.
  • Done by a program called a packet filter.
  • This mechanism is stateless- with no state kept between two packets (for example, between two packets of same destination) . Compare this with stateful inspection which maintains state while inspecting packets.

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