Basic CS-Networks [TCS Placement]: Sample Questions 52 - 53 of 133

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Question 52

Networks
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Describe in Detail

Essay▾

Define Retransmission?

Explanation

  • In retransmission receiver detects the occurrence of an error and asks the sender to resend the message.
  • Resending is repeated until a message arrives that the receiver believes is error-free.
  • Retransmission or automatic repeat request is resending damaged or lost packets- basic mechanism used by protocols operating over packet switched computer network.
  • Packet switched computer networks are otherwise ‘unreliable’ with no guarantees on delay, damage, order, or lost packets.
  • Protocols for reliable communication over such networks use a combination of acknowledgments, retransmission of missing or damaged packets, and checksums to provide that reliability.
Given the Image is Define the Retransmission Timer for Segment

Question 53

Networks
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Describe in Detail

Essay▾

What is MAU?

Explanation

  • Media Access Unit is also known as an Ethernet transceiver or MSAU (Multistation Access Unit) .
  • MAU is a device that interconnects the attachment unit interface port on an attached host computer to the Ethernet network medium (such as unshielded twisted pair or coaxial cable) .
  • MAU provides fault tolerance and are commonly either active or passive.
    • Passive MAU is not powered and does not strengthen signal from a device.
    • An active MAU is powered- repeats, and strengthens a signal.
  • The MAU provides services to the physical layer of the Open Systems Interconnection (OSI) reference model- provides electrical connection and a transceiver that maps the digital bits between the computer and the network and detects collisions and retries transmissions.
  • A MAU can be built into the computer workstation or other device or it can be a separate device.
Multistation Access Unit (MAU)

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