Computer Networks MCQs
1: protocols are?
A.
Agreements on how communication components and DTE's are to communicate
B.
Logical communication channels for transferring data
C.
Physical communication channels sued for transferring data
D.
None of above
2: Which data
communication method is used to transmit the data over a serial
communication
link?
A.
Simplex
B.
Half-duplex
C.
Full duplex
D.
All of above
3: The method of
communication in which transaction takes place in both directions,but
only
in one direction at a time, is called ?
A.
Simplex
B.
Four wire circuit
C.
Full duplex
D.
Half-duplex
4: In communication
satellite, multiple repeaters are known as?
A.
Detectors
B.
Modulators
C.
Stations
D.
Transponders
5: Error detection at
the data link layer is achieved by?
A.
Bit stuffing
B.
Cyclic redundancy codes
C.
Hamming codes
D.
Equalization
6: Loss in signal
power as light travels down the fiber is called?
A.
Attenuation
B.
Propagation
C.
Scattering
D.
Interruption
7: The topology with
highest reliability is ?
A.
Bus topology
B.
Star topology
C.
Ring Topology
D.
Mesh Topology
8: Baud means?
A.
The number of bits transmitted per unit time
B.
The number of byted transmitted per unit time
C.
The rate at which the signal changes
D.
None of above
9: In OSI model
dialogue control and token management are responsibilities of ?
A.
Session Layer
B.
Network layer
C.
Transport layer
D.
Data link layer
10: Under mark
parity,each parity bit is?
A.
Alternated between 0 and 1
B.
Always set to 0
C.
Always set to 1
D.
Not used
11: How long is an
IPv6 address?
A.
32 bits
B.
128 bits
C.
128 bytes
D.
64 bits
Explanation: An
IPv6 address is 128 bits long.
12: You have 10 users
plugged into a hub running 10Mbps half-duplex. There is a server
connected
to the switch running 10Mbps half-duplex as well. How much bandwidth does
each
host have to the server?
A.
100 kbps
B.
10 Mbps
C.
1 Mbps
D.
2 Mbps
Explanation: Each
device has 10 Mbps to the server.
13: How often are
BPDUs sent from a layer 2 device?
A.
Every 2 seconds
B.
Never
C.
Every 10 minutes
D.
Every 30 seconds
Explanation: Every
2 seconds, BPDUs are sent out from all active bridge ports by default.
14: Which router
command allows you to view the entire contents of all access lists?
A.
show all access-lists
B.
show access-lists
C.
show ip interface
D.
show interface
Explanation: To see
the contents of all access lists, use the show access-lists command.
15: What protocols are
used to configure trunking on a switch?
A.
VLAN Trunking Protocol
B.
VLAN
C.
802.1Q
D.
ISL
Explanation: VTP is
not right because it has nothing to do with trunking except that it
sends
VLAN information across a trunk link. 802.1Q and ISL are used to configure
trunking
on a port.
16: How many collision
domains are created when you segment a network with a 12-port
switch?
A.
1
B.
12
C.
5
D.
2
Explanation: Layer
2 switching creates individual collision domains.
17: Which protocol
does Ping use?
A.
TCP
B.
ARP
C.
ICMP
D.
BootP
Explanation: ICMP
is the protocol at the Network layer that is used to send echo requests
and
replies.
18: What PPP protocol
provides dynamic addressing, authentication, and multilink?
A.
NCP
B.
HDLC
C.
X.25
D.
LCP
Explanation: Link
Control Protocol in the PPP stack provides dynamic addressing,
authentication,
and multilink.
19: What is a stub
network?
A.
A network that has only one entry and exit point.
B.
A network with only one entry and no exit point.
C.
A network with more than one exit point.
D.
A network with more than one exit and entry point.
Explanation: Stub
networks have only one connection to an internetwork. Only default
routes
can be set on a stub network or network loops may occur.
20: Which of the
following services use TCP?
A.
DHCP
B.
SMTP
C.
FTP
D.
TFTP
E.
HTTP
Explanation: SMTP,
HTTP and FTP use TCP.
21: Which of the
following is private IP address?
A.
192.168.24.43
B.
168.172.19.39
C.
172.15.14.36
D.
12.0.0.1
Explanation: Class
A private address range is 10.0.0.0 through 10.255.255.255. Class B
private
address range is 172.16.0.0 through 172.31.255.255, and Class C private address
range
is 192.168.0.0 through 192.168.255.255.
22: Which class of IP
address provides a maximum of only 254 host addresses per
network
ID?
A.
Class A
B.
Class B
C.
Class C
D.
Class D
E.
Class E
Explanation: A
Class C network address has only 8 bits for defining hosts: 28 - 2 = 254.
23: In dial up remote
access a client uses the ---- to create a physical connection to a part
on
a remote access server of the private network.
A.
Public telephone network
B.
Bank??s branch network
C.
Private network
D.
Public local network
24: Which of the
following devices is a PC component that connects the computer to the
network?
A.
Bridge
B.
NIC
C.
DNS Server
D.
Gateway
Explanation: NIC
(Network Interface Card) is a physical PC Component which is used to
make
an interface between PC and Network using PCI Slots on Mother board.
25: Which of the
following devices modulates digital signals into analog signals that can be
sent
over traditional telephone lines?
A.
Router
B.
Gateway
C.
Switch
D.
Modem
Explanation: Modem
is device that Modulate Digital Signals to Analog Signals that can be
sent
to telephone line.
26: Which of the
following devices takes data sent from one network device and forwards
it
to all devices on the network regardless of the intended recipient?
A.
DNS Server
B.
Switch
C.
Hub
D.
Gateway
Explanation: Hub is
a basic Network Device that sent data from one network device and
sent
to all devices because Hub is a broadcasting device.
27: Which of the
following devices takes data sent from one network device and forwards
it
to the destination node based on MAC address?
A.
Hub
B.
Switch
C.
Gateway
D.
Modem
Explanation: The
Answer is Switch because it is an unicasting device and sent data to
particular
another device according to MAC address. Switch Include memory to store all
MAC
address of connected devices.
28: Although they've
fallen out of favor, which of the following devices is used to connect
different
network segments and manage the traffic between them?
A.
Bridge
B.
Hub
C.
Gateway
D.
Repeater
29: Which of the
following devices direct network traffic based not by MAC addresses but
by
software-configured network addresses?
A.
Router
B.
Hub
C.
Bridge
D.
NIC
Explanation: First
of all Router is a software based deviced that can be configure Network
Address
According to requirements. This can be connect two diffrent networks.
30: Which of the
following network devices/systems translates data from one format to
another?
A.
Hub
B.
DHCP Server
C.
Gateway
D.
NIC
31: Which of the
following terms is used to describe a hardware- or software-based device
that
protects networks from outside threats?
A.
NIC
B.
Gateway
C.
Firewall
D.
Hub
32: Which of the
following devices assigns IP address to devices connected to a network
that
uses TCP/IP?
A.
DHCP Server
B.
NIC
C.
Gateway
D.
Hub
Explanation: DHCP
(Dynamic Host Configuration Protocol) is used to provide Ip Address
to
all connected devies dynamicaly that uses TCP/IP.
33: Which of the
following devices translates hostnames into IP addresses?
A.
DNS Server
B.
Hub
C.
DHCP Server
D.
Firewall
34: Switch is a Device
of _________ Layer of OSI Model.
A.
Network Layer
B.
Data Link Layer
C.
Application Layer
D.
Session Layer
Explanation: Switches
Operate On The Second Layer of OSI Model That is Data Link
Layer.
35: HUB is a _________
Device and Switch is a ________ Device.
A.
Unicast, Multicast
B.
Malticast, Unicast
C.
Broadcast, Unicast
D.
None of Above
Explanation: Hub is
a Broadcasting Device and Switch is a Unicasting Device because
Switch
have Memory Element to Store MAC Address.
36: Star Topology is
Based On a Central Device that can be __________ ?
A.
HUB
B.
Switch
C.
Only A
D.
Both A and B
Explanation: HUB
and Switch are used in Star Type Networks.
37: The data on a DVD
is held in the form of ....... on the disc.
A.
small pits and bumps
B.
small bits
C.
small bytes
D.
None of These
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