This set of Data communication and Networking Multiple Choice Questions and Answers (MCQs) focuses on “Data transmission Interfaces and Modems”.
1. RS-232 is now known as _______
- OSI-232
- EIA-232
- ITU-232
- IEEE-232
2. The most popular implementation of EIA-232 is a _______-pin interface
- 23
- 25
- 232
- 9
3. One implementation of EIA-232 uses a _______-pin interface
- 23
- 25
- 232
- 9
4. The number of pins, the cable length, and the pin configuration are _______ specifications of the EIA-232 interface standard
- mechanical
- electrical
- functional
- any of the above
5. The voltage level and the signal type are _______ specifications of the EIA-232 interface standard
- mechanical
- electrical
- functional
- any of the above
6. In its most popular implementation, the EIA-232 interface standard defines _______ wires for actual data transmission
- 25
- 21
- 12
- 4
7. In the DB-25 implementation, the majority of the EIA-232 interface wires are used for _______
- data transmission
- control and timing
- test mode
- future assignment
8. DB-25 and DB-9 are two implementations of the _______ standard.
- EIA-232
- EIA-449
- EIA-530
- X.21
9. The _______ implementation of EIA-232 is often used in a single asynchronous connection
- DB-37
- DB-25
- DB-9
- X.21
10. If two DTEs are to be connected directly, a _______ can be used
- null modem
- modem
- repeater
- bridging device
11. In a null modem, the _______ pins are rewired so that DTEs can directly connect to each other
- data transfer
- set up
- timing
- all of the above
12. A null modem has _______ connector(s).
- one male and one female
- two male
- two female
- only one
13. The _______ interface standard specifies a 4000-feet transmission distance
- EIA-232
- RS-422
- EIA-530
- X.21
14. _______ specifies two connectors, one with 37 pins and one with 9 pins
- EIA-232
- RS-422
- EIA-449
- X.21
15. The _______ standard removed all functions relating to the secondary channel to a separate 9-pin connector
- EIA-232
- RS-422
- EIA-449
- X.21
16. RS-423 and RS-422 are electrical specifications for _______.
- EIA-232
- RS-422
- EIA-449
- X.21
17. RS-423 is a(n) _______ circuit specification with _______ line(s) for signal propagation
- balanced; one
- balanced; two
- unbalanced; one
- unbalanced; two
18. RS-422 is a(n) _______ circuit specification with _______ line(s) for signal propagation.
- balanced; one
- balanced; two
- unbalanced; one
- unbalanced; two
19. The data rate for RS-423 ranges from _______ Kbps to _______ Kbps.
- 1; 10
- 1; 100
- 10; 100
- 10; 1000
20. The data rate for RS-422 ranges from _______ Kbps to _______ Mbps
- 1; 10
- 1; 100
- 10; 100
- 10; 1000
21. RS-422 specifies two lines that carry _______
- two identical signals
- two signals, one the complement of the other
- two different signals
- none of the above
22. _______ is an interface standard similar to EIA-449, but specifying the use of the DB-25 connector
- EIA-232
- RS-422
- EIA-530
- X.21
23. _______ is an interface standard designed by the ITU-T
- EIA-232
- RS-422
- EIA-530
- X.21
24. The maximum data rate of a half duplex ASK modem using a two-wire regular telephone line is ___________ bps
- 1200
- 2400
- 3600
- none of above
25. The maximum data rate of a full duplex ASK modem using a two-wire regular telephone line is ___________ bps
- 1200
- 2400
- 3600
- none of above
26. The maximum data rate of a full duplex ASK modem using four-wire regular telephone line is ___________ bps.
- 1200
- 2400
- 3600
- none of above
27. The maximum data rate of a half duplex FSK modem using a two-wire regular telephone line with two carrier frequencies separated by 1000 Hz from each other is ___________ bps
- 1400
- 2400
- 3600
- none of above
28. The maximum data rate of a full duplex FSK modem using a two-wire regular telephone line with two carrier frequencies in each direction separated 500 Hz from each other is ___________ bps
- 1400
- 700
- 3600
- none of above
29. The maximum data rate of a half duplex 2-PSK modem using a two-wire regular telephone line is ___________ bps
- 1200
- 2400
- 3600
- none of above
30. The maximum data rate of a half duplex 8-PSK modem using a two-wire regular telephone line is ___________ bps.
- 1200
- 2400
- 7200
- none of the above
31. The maximum data rate of a full duplex 8-PSK modem using a two-wire regular telephone line is ___________ bps
- 1200
- 3600
- 7200
- none of above
32. The maximum data rate of half duplex 64-QAM modem using a two-wire regular telephone line is ___________ bps
- 4800
- 9600
- 14400
- none of above