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Which of the following are Gigabit Ethernets?

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Which of the following are Gigabit Ethernets?

(a) 1000 BASE-SX

(b) 1000 BASE-LX

(c) 1000 BASE-CX

(d) All of the mentioned

I got this question in an interview for internship.

The origin of the question is Analyzing Subnet Masks topic in section TCP/IP Protocol Suite of Computer Network

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The correct choice is (d) All of the mentioned

To elaborate: In computer networking, Gigabit Ethernet (GbE or 1 GigE) is a term describing various technologies for transmitting Ethernet frames at a rate of a gigabit per second (1,000,000,000 bits per second), as defined by the IEEE 802.3-2008 standard. It came into use beginning in 1999, gradually supplanting Fast Ethernet in wired local networks, as a result of being considerably faster.

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