Basic CS [3i Infotech Placement]: Sample Questions 210 - 211 of 243

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Question 210

Basic CS

Describe in Detail


What is Kerberos?


Define Kerberos in Image
  • Protocol for authenticating service requests between trusted hosts across an untrusted network like internet.
  • Developed for project Athena at Massachusetts Institute of Technology.
  • Works by requesting an encrypted ticket via an authenticated server sequence to use services.
  • Protocol gets its name from the three headed dog that guarded the gates of Hades in Greek mythology.
  • Uses encryption to prevent intruders from discovering passwords and gaining unauthorized access to files.
  • The ticket-granting ticket is sent to the ticket-granting server, which is required to use the same authentication server.
  • Ticket is then embedded in message to identify the sender of the message.

Benefits of Kerberos:

  • Delegated authentication.
  • Interoperability.
  • More efficient authentication to server.
  • Mutual authentication.

Question 211

Basic CS

Describe in Detail


Describe functions of repeater, router, bridges, and switches



  • Used for network interconnection,
  • Receives network signal from one LAN terminal cable segment and regenerates and retransmits the signal to another segment.
  • Maintains original strength when transmitting over a one or more cable segments.
  • Repeater regenerates the strength of the signal before transmitting it.


  • Two types of functions:
    1. Static
      1. Require an administrator to set up and configure the routing table.
    2. Dynamic
      1. Designed to discover routes automatically and therefore requires minimal configuration.
Two Types of Functions


  • A networking device that creates a single aggregate network from multiple communication networks or network segments.
  • Allows multiple different networks to communicate independently while remaining separate
  • Bridging connects two separate networks as one network.

    Four types of network bridging

    1. Simple bridging
    2. Multiport bridging
    3. Transparent bridging
    4. Source route bridging
Four Types of Network Bridging


  • Receives information from any connected source and dispatches it to the appropriate destination.
  • Forwards a message to a specific host.
  • Used when any host on the network or a switch sends a message to another host on the same network or switch.
  • The switch receives and decodes the frames to read the physical address portion of the message.

Developed by: