Basic CS [3i Infotech Placement]: Sample Questions 78 - 79 of 243

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Question 78

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Write in Short

Short Answer▾

Paging is a memory management function, while multiprogramming is a processor management function, are the two interdependent?

Explanation

  • Yes, paging and multiprogramming are independent.
  • Multiprogramming requires large memory for many processors, virtual memory and paging provide nearly infinite memory. Paging divides address space into smaller segments stored in secondary storage.
  • Moreover, main memory is limited and multiprogramming necessitates multiple working sets in the RAM. Intelligent memory management may thus improve performance.

Question 79

Basic CS
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Describe in Detail

Essay▾

What are different types of networking and internetworking devices?

Explanation

Difference Types of Networking and Internetworking

4 Types of Networking and Internetworking Devices Are

  1. Repeaters
  2. Bridges
  3. Routers
  4. Gateways

Repeater:

  • Operates only at the physical layer.
  • Increases the length of the network by correcting for the effect of signal attenuation.
  • Receives the signal in the network before it becomes weak, regenerates the original bit pattern and puts the refreshed copy back in to the link.
  • Forwards every frame; it has no filtering capability.

Bridge:

  • Operates in both the physical and logical data link layer.
  • Divides large network into smaller segments.
  • Contains logic allowing the traffic for each segment to be kept separate
  • Essentially a repeaters which relays a frame only on the side of the segment containing the intended recipient.
  • A bridge has a table that maps address to ports.
  • Limits or filters traffic keeping local traffic low.

Router:

  • Routes packets based on their logical address.
  • Operates in physical and data link layers.
  • Normally connects LANs and WANs in the internet
  • Has a routing table used for making decision on the route.
  • Routing tables are dynamic and updated using routing protocols.

Gateways:

  • Multi-purpose connection devices.
  • Accepts a packet formatted for one protocol and converts it to a packet formatted for another protocol before forwarding it.
  • Sometimes used to refer to a router.
  • Operates in all seven layers of OSI model.

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