1. Which of the following digits are known as the terminal number of the network user address

5-7

1-4

8-12

13-14

2. Which of the following digits are known as the area code of the network user address (NUA) ?

5-7

1-4

8-12

13-14

3. How many digits of the DNICC (Data Network Identiication Code) identify the country ?

First three

First four

First five

First six

4. How many digits of the network user Address are known as the DNIC (Data Network Identiication Code) ?

First three

First four

First five

First seven

5. Establishing a virtual connection is virtually equivalent to

connecting as virtual memory

physically connecting a DTE and DCE

placing a telephone call prior to a conversion

placing a modem prior to a conversion

6. It is desired to send a sequence of computer screen images over an optical fiber. The screen is 480 x 640 pixels, each pixel being 24 bits. There are 60 screen images per second. How much bandwidth is needed, and how many microns of wavelenth are needed for this band at 1.30 microns?

1.0 x 105 microns

2 x 105 microns

2.5 x 105 microns

5 x 105 microns

7. How much bandwith is there in 0.1 micron of spectrum at a wavelength of 1 micron ?

20,000 GHz

25,000 GHz

30,000 GHz

None of these

8. A 100 km long cable runs at the T1 data rate. The propagation speed in the cable is half the speed of light. How many bits is in the cable ?

572

672

772

873

9. To interface a computer terminal with a modem, required physical layer standard is

RS 424 - A

RS 232 - C

RS 449

Either (b) or (c

10. If a network designer wants to connect 5 routers as point-to-point simplex line, then total number of lines required would be

5

10

20

32