Google IT Support Professional:The Bits and Bytes of Computer Networking (Week 1) Introduction to Networking Quiz Answers.

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★The Physical Layer★

Q1.What is the type of modulation used by twisted pair cable computer networks known as?

1. Line crimping
2. Simplex communication
3. Line coding
4. RJ45

Line coding is the modulation of an electrical charge so that each side of a connection knows what is a one and what is a zero.

Q2.What's the difference between full and half duplex?

1. Full duplex is slower than half duplex.
2. Full duplex allows communications in two directions at the same time; half duplex means that only one side can communicate at a time.
3. Full duplex is a form of simplex communications.
4. Half duplex occurs when hubs are in use; full duplex occurs when switches are in use.

A half duplex connection allows communication in both directions, but only one side can communicate at a time.

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