Sandfoundry Network Chap 2

1. The physical layer is concerned with ___________

• a) bit-by-bit delivery
• b) process to process delivery
• c) application to application delivery
• d) port to port delivery

2. Which transmission media provides the highest transmission speed in a network?

• a) coaxial cable
• b) twisted pair cable
• c) optical fiber
• d) electrical cable

3. Bits can be sent over guided and unguided media as analog signal by ___________

• a) digital modulation
• b) amplitude modulation
• c) frequency modulation
• d) phase modulation

4. The portion of physical layer that interfaces with the media access control sublayer is called ___________

• a) physical signalling sublayer
• b) physical data sublayer
• c) physical address sublayer
• d) physical transport sublayer

5. The physical layer provides __________

• a) mechanical specifications of electrical connectors and cables
• b) electrical specification of transmission line signal level
• c) specification for IR over optical fiber
• d) all of the mentioned

6. In asynchronous serial communication the physical layer provides ___________

• a) start and stop signalling
• b) flow control
• c) both start & stop signalling and flow control
• d) only start signalling

7. The physical layer is responsible for __________

• a) line coding
• b) channel coding
• c) modulation
• d) all of the mentioned

8. The physical layer translates logical communication requests from the ______ into hardware specific operations.

• a) data link layer
• b) network layer
• c) trasnport layer
• d) application layer

9. A single channel is shared by multiple signals by ____________

• a) analog modulation
• b) digital modulation
• c) multiplexing
• d) phase modulation

10. Wireless transmission of signals can be done via ___________

• a) radio waves
• b) microwaves
• c) infrared
• d) all of the mentioned