1. Which of the following systems or applications is based on circuit switching?

A. VoIP

B. EoIP

C. PSTN

D. Internet

2. Which of the following description about ADSL is more accurate?

A. ADSL is newly installed digital subscriber line with coaxial cable

B. ADSL is newly installed digital subscriber line with optical fiber

C. ADSL is used for traditional telephone service

D. ADSL is broadband access system based on traditional twisted wire

3. If you are risk averse, you would choose:

A. PBX

B. Centrex

4. Asynchronous protocols use the parity bit for:

A. start of character

B. end of character

C. error checking

D. BCC

5. The direct physical connection between two communication nodes is a:

A. channel

B. circuit

C. path

D. network