49. Which of the following communications lines is best suited to interactive processing applications? |
| narrow band channel |
| simplex lines |
| full duplex lines |
| mixed band channels |
50. In a synchronous modem, the receive equilizer is known as |
| daptive equilizer |
| mpariment equilizer |
| tatistical equilizer |
| ompromise equilizer |
51. Maximum length of DOS command using any optional parameter is |
| 26 characters |
| 87 characters |
| 127 characters |
| None of above |
52. xcopy command can copy |
| individual files or group of files |
| directories including subdirectories |
| to diskette of a different capacity |
| all of above |
53. What is the number of separate protocol layers at the serial interface gateway specified by the X.25 standard? |
| 4 |
| 2 |
| 6 |
| 3 |
54. CHKDSK can be used to find |
| Disk’s bad portion |
| Occupied space |
| Free space |
| All of above |
55. One disadvantage of a direct access file is: |
| the delay in computiong the storage address |
| duplication of address locations |
| unsued, but available, storage locations |
| all of above |
56. What is the main difference between DDCMP and SDLC? |
| DCMP does not need special hardware to final the beginning of a message |
| DCMP has a message header |
| DLC has a IP address |
| DLC does not use CRC |
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