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In the MAC address 3C:5A:B4:12:34:56, what does the first three octets 3C:5A:B4 signify?

medium📝 Analysis Q4 of 15
Computer Networks - Physical and Data Link Layer
In the MAC address 3C:5A:B4:12:34:56, what does the first three octets 3C:5A:B4 signify?
AThe device's unique serial number
BThe Organizationally Unique Identifier (OUI) assigned to the manufacturer
CThe network segment identifier
DThe IP address of the device
Step-by-Step Solution
Solution:

  1. Step 1: Understand MAC address structure

    The first three octets (24 bits) of a MAC address represent the OUI, which identifies the manufacturer.

  2. Step 2: Identify the meaning of the first half

    In 3C:5A:B4:12:34:56, 3C:5A:B4 is the OUI.

  3. Final Answer:

    The Organizationally Unique Identifier (OUI) assigned to the manufacturer -> Option B

  4. Quick Check:

    First 3 octets = manufacturer OUI [OK]
Quick Trick: First 3 octets = manufacturer OUI [OK]
Common Mistakes:
MISTAKES
  • Confusing OUI with device serial number
  • Thinking MAC contains IP info
  • Assuming network segment is encoded in MAC

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