Zainul DC

The basic component necessary for communication is a _______.

• (A) computer terminal

• (B) modem

• (C) communications software

• (D) all of these

Coaxial cable has conductors with_____.

• (A) a common axis

• (B) equal resistance

• (C) the same diameter

• (D) none of these

The synchronous modems are more expensive than the asynchronous modems because_____.

• (A) they must contain clock recovery circuits

• (B) production volume is larger

• (C) they must operate on a larger bandwidth

• (D) They are larger

4. The loss in signal power as light travels down the fibre is called _____.

• (A) propagation

• (B) attenuation

• (C) scattering

• (D) absorption

Multiple repeaters in communication satellites are called _____.

• (A) detector

• (B) modulator

• (C) transponders

• (D) stations

Which of the following is possible in a token passing bus network?

• (A) Unlimited number of stations

• (B) Unlimited distance

• (C) In-service expansion

• (D) Multiple time-division channels

Satellite in geosynchronous orbit _____.

• (A) remains in a fixed position relative to points on earth

• (B) can cover about 80

• (C) moves faster than the earth’s rotation so that it can cover a larger portion of the earth

• (D) remains in a fixed position so as the earth rotates it can fully cover the earth

In OSI network architecture, the routing is performed by _____.

• (A) a data link layer

• (B network layer

• (C) transport layer

• (D) session layer

In OSI network architecture, the dialogue control, and token management are responsibilities of _____.

• (A) data link layer

• (B) network layer

• (C) transport layer

• (D) session layer

Which of the following is not an example of data communication?

• (A) A teletype printing news bulletin.

• (B) A computer transmitting files to another computer

• (C An automatic teller machine checking account balance with the bank’s computer

• (D) A salesman telephoning order to the office