Basic CS-Networks [TCS Placement]: Sample Questions 87 - 88 of 133

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Question 87

Networks
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Describe in Detail

Essay▾

What is a multi-homed host?

Explanation

Host with multiple network interfaces requiring multiple IP addresses which appears on multiple networks. Each interface is connected to logically and physically separate network segments

  • It may be used to forward packets between network
  • Dual-homed host (host with two interfaces) is used in dual-homed firewall- one interface connected to untrusted network while other interface connected to trusted network.
  • Firewall does not allow malicious traffic coming in from the untrusted network into the trusted network
Given the Image is Define the Multi-Homed Host/Node

Question 88

Networks
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Describe in Detail

Essay▾

What are the important topologies for networks?

Explanation

BUS Topology

  • Bus is central cable that connects all devices on a local-area network also called the backbone.
  • Often used to describe the main network connections composing the Internet.
  • Relatively inexpensive and easy to install for small networks.
  • Ethernet systems use a bus topology.
    • Main Advantage: Easy to connect a computer or device and typically requires less cable than star topology.
    • Main Disadvantage: Entire network shuts down if there is a break in the bus.
Given the Image is Define the Bus Topology Consists of a Main Run of Cable with a Terminator at Each End

STAR Topology

  • Devices are connected to a central computer, called a hub.
  • Nodes communicate by passing data through the hub.
    • Main Advantage: One malfunctioning node does not affect the rest of the network.
    • Main disadvantage: Central computer is a single point of failure- upon its failure the entire network becomes unusable.
Given the Image is Define the Star Topology is Designed with Each Node Connected Directly to a Central Network Hub

RING Topology

  • A local-area network (LAN) whose topology is a ring- all of the nodes are connected in a closed loop.
  • Messages travel around the ring, with each node reading messages addressed to it.

    Main Advantage: It can span larger distances than other networks, such as bus networks, because each node regenerates messages as they pass through it.

Ring Topology

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