Data Communication and Networking – Switching Methods – Public Switched Telephone Network (PSTN) MCQs

1. A message from device A consists of packet X and packet Y. In the virtual circuit approach to packet switching, packet Y's path _______ packet X's.

2. In the PSTN hierarchy, the class one switching centers are known as the _______ offices

3. In the PSTN hierarchy, the class two switching centers are known as the _______ offices

4. In the PSTN hierarchy, the class three switching centers are known as the _______ offices

5. In the PSTN hierarchy, the class four switching centers are known as the _______ offices.

6. In the PSTN hierarchy, the class five switching centers are known as the _______ offices

7. Subscriber telephones in the PSTN are connected through _______ to end offices

8. Subscriber telephones in the PSTN are connected through local loops to _______ offices

9. In the PSTN hierarchy, there are more _______ offices than _______ offices

10. At the top of the PSTN hierarchy are the _______ offices.

11. At the bottom of the PSTN hierarchy are the _______ offices.

12. In touch-tone dialing, when the 9 key is pressed, _______ bursts of analog signals are sent to the end office.

13. If analog signals with frequencies of 770 Hz and 1209 Hz are received by the end office, a _______ has been dialeD

14. If analog signals with frequencies of 941 Hz and 1336 Hz are received by the end office, a _______ has been dialeD.