The number of bits used for addressing in Gigabit Ethernet is __________.
2017
The number of bits used for addressing in Gigabit Ethernet is __________.
- A.
32 bits
- B.
48 bits
- C.
64 bits
- D.
128 bits
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Correct answer: B
Answer: 48 bits — Gigabit Ethernet uses 48-bit MAC (hardware) addresses.
Explanation:
What addressing means here: the MAC (hardware) address assigned to an Ethernet network interface.
Why 48 bits: a MAC address is 6 octets (6 × 8 = 48 bits). It is commonly shown in hexadecimal as six groups, for example 00:1A:2B:3C:4D:5E.
Why the other values are incorrect: 32 bits refers to an IPv4 address length, 128 bits refers to an IPv6 address length, and 64 bits is often seen as an IPv6 interface identifier—not as an Ethernet MAC address.