201. Slotted ALOHA

divide time into discrete intervals

require global time synchronization

both (a) and (b)

none of these

202. Working of the WAH generally involves

telephone lines

micro waves

satellites

All of these

203. Which of the following program is used to copy files to or from another using time sharing system over a single link ?

VMTP

TFTP

UUCP

UART

204. A station in a network forward incoming packets by placing them on its shortest output queue. What routing algorithm is being used ?

Hot potato routing

Floding

Static routing

Delta routing

205. Four bits are used for packed sequence numbering in a sliding window protocol used in a computer network. What is the maximum window size ?

4

8

15

16

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

5-7

1-4

8-12

13-14

207. 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

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

First three

First four

First five

First six

209. 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

210. 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

211. 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

212. 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

213. 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

214. 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

215. 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

216. In which circuit switching, delivery of data is delayed because data must be stored and retrieved from RAM

space-division

time-division

virtual

packet

217. IBM's Token-Ring network uses

adaptive routing

source routing

alternative routing

spanned tree routing

218. Which of the following uses an 8B/6T encoding scheme?

100 Base-TX

100 Base-FX

100 Base-T4

100 Base-T1

219. Which of the given below houses the switches in Token Ring ?

NIC

MAU

Nine-pin connector

Transceiver

220. Ether LAN uses

polar encoding

diferential manchester encoding

manchester encoding

NRZ