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  • Networking Devices MCQs & PYQs with Explanations | Suraku Academy

Q: 1 The size of MAC address (in bits) is—

  1. 24

  2. 48

  3. 36

  4. 42

[ Option B ]

A MAC (Media Access Control) address is a hardware identifier assigned to each Network Interface Card (NIC). It works at the Data Link Layer of the OSI model and ensures that each device on a local network can be uniquely identified.

  • MAC addresses are used to send data between devices on the same network segment.
  • They are permanent and unique, unlike IP addresses which can change.
  • A MAC address is 48 bits long.
  • It is typically written in hexadecimal notation as six groups of two digits as 00:1B:2C:3E:4B:BB.
  • The first 24 bits represent the manufacturer OUI (Organizationally Unique Identifier), and the last 24 bits represent the unique Device ID.

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