Basic CS [TCS Placement]: Sample Questions 125 - 126 of 196

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Question 125

Basic CS
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Describe in Detail

Essay▾

What is Error Control?

Explanation

  • Error control includes both error detection and error correction. Error control in the data link layer is based on automatic repeat request. Whenever an error is detected, specified frames are retransmitted.
  • Allows receiver to request lost or damaged frames and coordinate the retransmission of those frames by the sender- in the data link layer, the term error control refers to methods of error detection and retransmission by checking reliability of characters both at the bit level and packet level.
  • With proper error control transmitted and received data will be identical, as in many cases communication channels can be highly unreliable
Given the Image is Define the Error Control

Question 126

Basic CS
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Describe in Detail

Essay▾

What is MAC address?

Explanation

  • The address for a device as it is identified at the Media Access Control (MAC) layer in the network architecture.
  • MAC addresses are generally assigned by the vendor/manufacturer of every network interface card (NIC) developed.
  • They are stored in ROM on the network adapter card and are unique.
  • The Media Access Control (MAC) Address identifies Ethernet network cards or simply PCs that have built-in Ethernet.
  • Internet connections however do not use Ethernet.
  • Unlike IP Addresses, computers that share a specific local network will not have similar MAC addresses.
  • They are implemented in most network types, but unlike IP address, MAC addresses are permanent and cannot be changed.
  • A MAC address uses specifications of IEEE. Each MAC address consists of a 12-digit hexadecimal notation is composed of a six-digit manufacturer՚s organization unique identifier followed by a six-digit serialized or random unique identifier.
Given the Image is Define the MAC Address (Media Access Control Address)

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