Topic 2: NDC

What is the main function of the physical layer?

• Encrypt data

• Route packets

• Transmit raw bits over a communication medium

• Manage IP addressing

Which of the following is NOT part of the physical layer?

• Cables

• Hubs

• Switches

• IP addresses

Which of these is a physical transmission medium?

• Wi-Fi

• Optical fiber

• HTTP

• IP

The unit of data at the physical layer is called a:

• Packet

• Segment

• Bit

• Frame

What does the physical layer NOT concern itself with?

• Signal encoding

• Voltage levels

• Error correction

• Cable specifications

Which of these is a guided transmission medium?

• Radio waves

• Infrared

• Coaxial cable

• Bluetooth

Which layer in the OSI model is responsible for electrical signals?

• Data Link

• Physical

• Network

• Transport

What kind of signal is used in fiber optic cables?

• Electrical

• Radio

• Light

Which topology is most related to the physical layer?

• Star

• Bus

• Ring

• All of the above

The physical layer is Layer ___ in the OSI model.

• 7

• 1

• 3

• 4