UGC NET Sample Questions Networks and communications

June 2012

11. X.25 is ________ Network.

(A) Connection Oriented Network

(B) Connection less Network

(C) Either Connection Oriented or Connection Less

(D) Neither Connection Oriented nor Connection Less

Answer: A

29. Which of the following IP address class is a multicast address?

(A) Class A (B) Class B

(C) Class C (D) Class D

Answer: D

41. Which layer of OSI reference model uses the ICMP (Internet Control Message Protocol)?

(A) Transport layer

(B) Data link layer

(C) Network layer

(D) Application layer

Answer: C

54. What is the size (in terms of bits) of Header length field in IPV4 header?

(A) 2 (B) 4

(C) 8 (D) 16

Answer: B

60. Radio signals generally propagate according to the following mechanisms:

(A) Modulation, Amplification, Scattering

(B) Reflection, Diffraction, Scattering

(C) Amplification, Diffraction, Modulation

(D) Reflection, Amplification, Diffraction

66. If the period of a signal is 1000 ms, then what is its frequency in kilohertz ?

(A) 10–3 KHz (B) 10–2 KHz

(C) 10–1 KHz (D) 1 KHz

5. Networks that use different technologies can be connected by using

(A) Packets

(B) Switches

(C) Bridges

(D) Routers

6. Both hosts and routers are TCP/IP protocol software. However, routers do not use protocol from all layers. The layer for which protocol software is not needed by a router is

(A) Layer – 5 (Application)

(B) Layer – 1 (Physical)

(C) Layer – 3 (Internet)

(D) Layer – 2 (Network Interface)

14. Which of the following TCP/IP Internet protocol is diskless machine uses to obtain its IP address from a server?

(A) RAP

(B) RIP

(C) ARP

(D) X.25

15. Decryption and encryption of data are the responsibility of which of the following layer?

(A) Physical layer

(B) Data Link layer

(C) Presentation layer

(D) Session layer

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

(A) Space division

(B) Time division

(C) Virtual

(D) Packet

17. In which Routing Method do all the routers have a common database?

(A) Distance vector

(B) Link state

(C) Link vector

(D) Dijkestra method

18. Page Shift Keying (PSK) Method is used to modulate digital signal at 9600 bps using 16 level. Find the line signals and speed (i.e. modulation rate).

(A) 2400 bauds (B) 1200 bauds

(C) 4800 bauds (D) 9600 bauds

19. The station to hub distance in which it is 2000 metres.

(A) 100 Base-Tx

(B) 100 Base-Fx

(C) 100 Base-T4

(D) 100 Base-T1

28. Mobile IP provides two basic functions.

(A) Route discovery and registration

(B) Agent discovery and registration

(C) IP binding and registration

(D) None of the above

34. Check sum used along with each packet computes the sum of the data, where data is treated as a sequence of

(A) Integer

(B) Character

(C) Real numbers

(D) Bits

39. For the transmission of the signal, Bluetooth wireless technology uses

(A) Time division multiplexing

(B) Frequency division multiplexing

(C) Time division duplex

(D) Frequency division duplex

41. What is the routing algorithm used by RIP and IGRP ?

(A) OSPF

(B) Link-state

(C) Dynamic

(D) Dijkestra vector

45. ______ is a satellite based tracking system that enables the determination of person’s position.

(A) Bluetooth

(B) WAP

(C) Short Message Service

(D) Global Positioning System

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