11. A telephone conference call is an example of which type of communications?
[Paper II December 2011]
(A) same time / same place
(B) same time / different place
(C) different time / different place
(D) different time / same place
12. Which of the following IP
address class is a multicast address? [Paper
III June 2012]
(A) Class A (B)
Class B
(C) Class C (D)
Class D
13. Which layer of OSI
reference model uses the ICMP (Internet Control Message Protocol)?
[Paper III June 2012]
[Paper III June 2012]
(A) Transport layer (B) Data link layer
(C) Network layer (D) Application layer
14. What is the size (in terms
of bits) of Header length field in IPV4 header? [Paper III June 2012]
(A) 2 (B)
4
(C) 8 (D)
16
15. Radio signals generally
propagate according to the following mechanisms: [Paper III June 2012]
(A) Modulation, Amplification, Scattering
(B) Reflection, Diffraction, Scattering
(C) Amplification, Diffraction, Modulation
(D) Reflection, Amplification, Diffraction
16. Match the following with
link quality measurement and handoff initiation: [Paper III June 2012]
(a) Networked-Controlled Handoff (NCHO) (i) MS connect to BS
(b) Mobile-Assisted Handoff (MAHO) (ii) Process via channel the target BS
(c) Forward Handoff (iii)
First Generation Analog Cellular System
(d) Hard Handoff (iv)
Second Generation Digital Cellular System
(a) (b) (c) (d)
(A) (iii) (iv) (ii) (i)
(B) (ii) (iii) (i) (iv)
(C) (ii) (i) (iv) (iii)
(D) (iv) (iii) (i) (ii)
(D) (iv) (iii) (i) (ii)
17. If the period of a signal
is 1000 ms, then what is its frequency in kilohertz? [Paper III June 2012]
(A) 10–3 KHz (B)
10–2 KHz
(C) 10–1 KHz (D)
1 KHz
18. Networks that use different technologies can be connected by using
[Paper II June 2012]
(A) Packets (B) Switches
(C) Bridges (D) Routers
19. 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 [Paper II June 2012]
(A) Layer – 5 (Application)
(B) Layer – 1 (Physical)
(C) Layer – 3 (Internet)
(D) Layer – 2 (Network Interface)
20. Which of the following TCP/IP Internet protocol is diskless machine uses to obtain its IP address from a server? [Paper II June 2012]
(A) RAP (B) RIP
(C) ARP (D) X.25
SOLUTIONS
11. B
12. D
12. D
Class
|
Leading
bits
|
Size
of network number bit field
|
Size
of rest bit field
|
Addresses
per network
|
Start
address
|
End
address
|
Class A
|
0
|
8
|
24
|
16,777,216 (224)
|
0.0.0.0
|
127.255.255.254
|
Class B
|
10
|
16
|
16
|
65,536 (216)
|
128.0.0.0
|
191.255.255.254
|
Class C
|
110
|
24
|
8
|
256 (28)
|
192.0.0.0
|
223.255.255.254
|
Class D (multicast)
|
1110
|
not defined
|
not defined
|
not defined
|
224.0.0.0
|
239.255.255.255
|
Class E (reserved)
|
1111
|
not defined
|
not defined
|
not defined
|
240.0.0.0
|
255.255.255.255
|
13. C
The Internet Control Message Protocol (ICMP) is one of the core protocols of the Internet Protocol Suite. It is used by the operating systems of networked computers to send error messages indicating, for example, that a requested service is not available or that a host or router could not be reached.
14. B
15. A
16.
17. A
Freequency = 1/Period.
So freeq = 1 / 1000 x 10^-3 Hz
= 1 Hz
= 10^-3 KHz
18. D
A switch is nearly identical to a network hub, but a switch generally contains more intelligence than a hub. Unlike hubs, network switches are capable of inspecting data packets as they are received, determining the source and destination device of each packet, and forwarding them appropriately.
A bridge device filters data traffic at a network boundary. Bridges reduce the amount of traffic on a LAN by dividing it into two segments. Bridges operate at the data link layer (Layer 2) of the OSI model. Bridges inspect incoming traffic and decide whether to forward or discard it.
Routers are small physical devices that join multiple networks together. Technically, a router is a Layer 3 device, meaning that it connects two or more networks and that the router operates at the network layer of the OSI model.
19. B
A router can has only the three basic layers - Physical, Datalink and Network.
20. None of the given choices is the correct answer. RARP is a possible answer, which is not there in the options.
The Reverse Address Resolution Protocol (RARP) is a computer networking protocol used by a host computer to request its Internet Protocol (IPv4) address from an administrative host, when it has available its Link Layer or hardware address, such as a MAC address.
Route Access Protocol, RAP is a protocol that utilizes port 38 and is used for distributing routing information at all levels of the Internet.
The Routing Information Protocol (RIP) is one of the oldest distance-vector routing protocol, which employs the hop count as a routing metric.
Address Resolution Protocol (ARP) is a telecommunications protocol used for resolution of network layer addresses into link layer addresses i.e. to convert an IP address to a physical address such as an Ethernet address.
X.25 is a standard suite of protocols used for packet switching across computer networks.
Freequency = 1/Period.
So freeq = 1 / 1000 x 10^-3 Hz
= 1 Hz
= 10^-3 KHz
18. D
A switch is nearly identical to a network hub, but a switch generally contains more intelligence than a hub. Unlike hubs, network switches are capable of inspecting data packets as they are received, determining the source and destination device of each packet, and forwarding them appropriately.
A bridge device filters data traffic at a network boundary. Bridges reduce the amount of traffic on a LAN by dividing it into two segments. Bridges operate at the data link layer (Layer 2) of the OSI model. Bridges inspect incoming traffic and decide whether to forward or discard it.
Routers are small physical devices that join multiple networks together. Technically, a router is a Layer 3 device, meaning that it connects two or more networks and that the router operates at the network layer of the OSI model.
19. B
A router can has only the three basic layers - Physical, Datalink and Network.
20. None of the given choices is the correct answer. RARP is a possible answer, which is not there in the options.
The Reverse Address Resolution Protocol (RARP) is a computer networking protocol used by a host computer to request its Internet Protocol (IPv4) address from an administrative host, when it has available its Link Layer or hardware address, such as a MAC address.
Route Access Protocol, RAP is a protocol that utilizes port 38 and is used for distributing routing information at all levels of the Internet.
The Routing Information Protocol (RIP) is one of the oldest distance-vector routing protocol, which employs the hop count as a routing metric.
Address Resolution Protocol (ARP) is a telecommunications protocol used for resolution of network layer addresses into link layer addresses i.e. to convert an IP address to a physical address such as an Ethernet address.
X.25 is a standard suite of protocols used for packet switching across computer networks.
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