3i Infotech Papers: Sample Questions 773 - 774 of 1245

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Question number: 773

» Basic CS » Networks

Essay Question▾

Describe in Detail

What is Kerberos?

Explanation

Define kerberos in image

Define Kerberos in Image

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 number: 774

» Basic CS » Networks

Essay Question▾

Describe in Detail

Describe functions of repeater, router, bridges, and switches

Explanation

Repeater:

  • 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.

Router:

  • 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

Two Types of Functions

Two types of functions

Bridge:

  • 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

Four Types of Network Bridging

Four types of network bridging

Switches:

  • 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.