CN Quiz-2

1.    At the _______ layer, the data unit is transformed into the corresponding electromagnetic signal.

• application

• data link

• session

• physical 

The _______ is defined by the physical layer.

•   logical address

• session dialog

• data rate 

• encryption method

Sender and receiver clock synchronization is a function performed by the _______ layer

• presentation

• session

• physical 

• data link

________ cable consists of two insulated copper wires twisted together.

• Coaxial

• Fiber-optic

• Twisted-pair

• none of the above

_____ cable can carry signals of higher frequency ranges than _____ cable.

• Twisted-pair; fiber-optic

• Coaxial; fiber-optic

• Coaxial; twisted-pair 

• A.    none of the above

______ cables are composed of a glass or plastic inner core surrounded by cladding, all encased in an outside jacket.

• Coaxial

• Fiber-optic 

• Twisted-pair

• none of the above

______ cables carry data signals in the form of light.

•    Coaxial

• Fiber-optic 

• Twisted-pair

• none of the above

In a fiber-optic cable, the signal is propagated along the inner core by _______

• reflection 

• refraction

• modulation

• none of the above

Which of the following is not a guided medium?

• twisted-pair cable

• coaxial cable

• fiber-optic cable

• atmosphere

When a beam of light travels through media of two different densities, if the angle of incidence is greater than the critical angle, _______ occurs.

• reflection 

• refraction

• incidence

•   criticism