Module 4 - Physical Layer

Which media uses patterns of light to represent bits?

• Fiber-optic

• Copper

• Wireless

Why are two strands of fiber used for a single fiber optic connection?

• They allow for full-duplex connectivity.

• They prevent crosstalk from causing interference on the connection.

• They increase the speed at which the data can travel.

• The two strands allow the data to travel for longer distances without degrading.

What is one advantage of using fiber optic cabling rather than copper cabling?

• It is able to carry signals much farther than copper cabling.

• It is able to be installed around sharp bends.

• It is usually cheaper than copper cabling.

• It is easier to terminate and install than copper cabling.

Which of the following fiber-optic cable types can travel approximately 100 km?

• Multimode

• Single-mode

True or false. Wireless is not well suited for enterprise networks.

• True

• False

What type of cable is used to connect a workstation serial port to a Cisco router console port using an adapter?

• Straight-through

• Crossover

• Coaxial

• Rollover

What PDU is received by the physical layer for encoding and transmission?

• Packet

• Segment

• Frame

• Rollover

True or false? When a frame is encoded by the physical layer, all bits are sent over the media at the same time.

• True

• False

What is indicated by the term throughput?

• The guaranteed data transfer rate offered by an ISP

• The time it takes for a message to get from sender to receiver

• The measure of the bits transferred across the media over a given period of time

• The measure of the usable data transferred across the media

Which of the following is the most common network media?

• Coaxial

• STP

• UTP