A MAC address is 48 bits long. How is it normally written?
AAs four decimal numbers separated by periods
BAs eight groups of hexadecimal numbers separated by colons
CAs twelve hexadecimal digits
DAs a 32 bit binary string
Answer & Solution
Correct answer: C. As twelve hexadecimal digits
1. Each MAC address is 48 bits in length.
2. Written in hexadecimal, each digit stands for 4 bits, so 48 bits need 12 digits.
3. A MAC address is therefore a 12-digit hexadecimal number.
4. The first six digits are the manufacturer's Organisational Unique Identifier and the last six are the card's serial number.
5. Option A describes IPv4 and option B describes IPv6, both of which are logical addresses, not hardware ones.
_Source: NCERT Computer Science Class 12, Ch 10 'Computer Networks', S10.6.1 MAC Address_
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