Question

In MAC address, Organisational Unique Identifier (OUI) consists of __________.

• A. 32 bits
• B. 48 bits
• C. 24 bits
• D. 64 bits

Hint:

MAC address = 48 bits → First 24 bits (OUI: manufacturer code), Last 24 bits (NIC-specific).

Answer 1

The Correct Option is C

Step 1: Structure of MAC address.
- A MAC address is 48 bits (6 bytes) long.
- It is divided into two parts: - OUI (Organisationally Unique Identifier): First 24 bits (first 3 bytes).
- NIC specific part: Last 24 bits (last 3 bytes).

Step 2: Correct answer.
Thus, OUI = 24 bits.
Final Answer: \[ \boxed{24 \text{ bits}} \]