Ethernet is a family of protocols used in

ALAN ✓ Correct

BThe internet

CAn extranet

DNone of the above

Correct answer: (A) LAN

Explanation

Ethernet is a family of protocols that defines wiring and signalling for local area networks.

The internet as a whole runs on the TCP/IP suite rather than being defined by Ethernet.

An extranet is a controlled-access network for outside partners, not the technology Ethernet specifies.

No other choice fits because Ethernet is squarely a LAN technology.

Ethernet standards cover cabling, frame format and access to the shared medium.

Ethernet was developed at Xerox PARC in the 1970s and standardised as IEEE 802.3.

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