Multiple Choice Questions of Computer
Networking
(Ans In Red Colour)
1-1 Computer
Network is
A. Collection of hardware components and computers
B. Interconnected by communication channels
C. Sharing of resources and information
D. All of the Above
1-2 What is a Firewall
in Computer Network?
A. The physical boundary of Network
B. An operating System of Computer Network
C. A system designed
to prevent unauthorized access
D. A web
browsing Software
1-3 How many layers
does OSI Reference Model has?
A. 4
B. 5
C. 6
D. 7
1-4 DHCP is the
abbreviation of
A. Dynamic Host Control Protocol
B. Dynamic Host
Configuration Protocol
C. Dynamic Hyper
Control Protocol
D. Dynamic Hyper Configuration Protocol
1-5 IPV4 Address is
A. 8 bit
B. 16 bit
C. 32 bit
D. 64 bit
1-6 DNS is the
abbreviation of
A. Dynamic Name System
B. Dynamic Network System
C. Domain Name
System
D. Domain
Network Service
1-7 What is the
meaning of Bandwidth in Network?
A. Transmission
capacity of a communication channels
B. Connected
Computers in the Network
C. Class of IP used in Network
D. None of Above
1-8 ADSL is the
abbreviation of
A. Asymmetric Dual Subscriber Line
B. Asymmetric Digital System Line
C. Asymmetric Dual System Line
D. Asymmetric Digital
Subscriber Line
1-9 What is the use of
Bridge in Network?
A. to connect LANs
B. to separate
LANs
C. to control Network Speed
D. All of the above
1-10 Router operates
in which layer of OSI Reference Model?
A. Layer 1 (Physical Layer)
B. Layer 3 (Network
Layer)
C. Layer 4
(Transport Layer)
D. Layer 7 (Application Layer)
Answers
1 – D / 2 – C / 3 – D / 4 – B / 5 – C / 6 – C / 7 – A / 8 –
D / 9 – A / 10 – B
2-1 Each IP packet
must contain
A. Only Source address
B. Only Destination address
C. Source and Destination address
D. Source or Destination address
2-2 Bridge works in
which layer of the OSI model?
A. Appliation layer
B. Transport layer
C. Network layer
D. Datalink layer
2-3 _______ provides a
connection-oriented reliable service for sending messages
A. TCP
B. IP
C. UDP
D. All of the above
2-4 Which layers of
the OSI model are host-to-host layers?
A. Transport, Session,
Persentation, Application
B. Network, Transport, Session, Presentation
C. Datalink, Network, Transport, Session
D. Physical, Datalink, Network, Transport
2-5 Which of the
following IP address class is Multicast
A. Class A
B. Class B
C. Class C
D. Class D
2-6 Which of the
following is correct regarding Class B Address of IP address
A. Network bit – 14, Host
bit – 16
B. Network bit – 16, Host bit – 14
C. Network bit – 18, Host bit – 16
D. Network bit – 12, Host bit – 14
2-7 The last address
of IP address represents
A. Unicast address
B. Network address
C. Broadcast address
D. None of above
2-8 How many bits are
there in the Ethernet address?
A. 64 bits
B. 48 bits
C. 32 bits
D. 16 bits
2-9 How many layers
are in the TCP/IP model?
A. 4 layers
B. 5 layers
C. 6 layers
D. 7 layers
2-10 Which of the
following layer of OSI model also called end-to-end layer?
A. Presentation layer
B. Network layer
C. Session layer
D. Transport layer
Answers
1 – C / 2 – D / 3 – A / 4 – A / 5 – D / 6 – A / 7 – C / 8 – B /
9 – A / 10 – D
3-1. Why IP Protocol
is considered as unreliable?
A. A packet may be lost
B. Packets may arrive out of order
C. Duplicate packets may be generated
D. All of the above
3-2. What is the
minimum header size of an IP packet?
A. 16 bytes
B. 10 bytes
C. 20 bytes
D. 32 bytes
3-3. Which of
following provides reliable communication?
A. TCP
B. IP
C. UDP
D. All of the above
3-4. What is the
address size of IPv6 ?
A. 32 bit
B. 64 bit
C. 128 bit
D. 256 bit
3-5. What is the size
of Network bits & Host bits of Class A of IP address?
A. Network bits 7, Host
bits 24
B. Network bits 8, Host bits 24
C. Network bits 7, Host bits 23
D. Network bits 8, Host bits 23
3-6. What does Router
do in a network?
A. Forwards a packet to all outgoing links
B. Forwards a packet to the next free outgoing link
C. Determines on which
outing link a packet is to be forwarded
D. Forwards a packet to all outgoing links except the originated link
3-7. The Internet is
an example of
A. Cell switched network
B. circuit switched network
C. Packet switched network
D. All of above
3-8. What does
protocol defines?
A. Protocol defines what data is communicated.
B. Protocol defines how data is communicated.
C. Protocol defines when data is communicated.
D. All of above
3-9. What is the uses
of subnetting?
A. It divides one large
network into several smaller ones
B. It divides network into network classes
C. It speeds up the speed of network
D. None of above
3-10. Repeater
operates in which layer of the OSI model?
A. Physical layer
B. Data link layer
C. Network layer
D. Transport layer
Answers
1 – D / 2 – C / 3 – A / 4 – C / 5 – A / 6 – C / 7 – C / 8 – D /
9 – A / 10 – A
4-1. What is the
benefit of the Networking?
A. File Sharing
B. Easier access to Resources
C. Easier Backups
D. All of the Above
4-2. Which of the
following is not the Networking Devices?
A. Gateways
B. Linux
C. Routers
D. Firewalls
4-3. What is the size
of MAC Address?
A. 16-bits
B. 32-bits
C. 48-bits
D. 64-bits
4-4. Which of the
following can be Software?
A. Routers
B. Firewalls
C. Gateway
D. Modems
4-5. What is the use
of Ping command?
A. To test a device on the
network is reachable
B. To test a hard disk fault
C. To test a bug in a Application
D. To test a Pinter Quality
4-6. MAC Address is
the example of
A. Transport Layer
B. Data Link Layer
C. Application Layer
D. Physical Layer
4-7. Routing tables of
a router keeps track of
A. MAC Address Assignments
B. Port Assignments to network devices
C. Distribute IP address to network devices
D. Routes to use for
forwarding data to its destination
4-8. Layer-2 Switch is
also called
A. Multiport Hub
B. Multiport Switch
C. Multiport Bridge
D. Multiport NIC
4-9. Difference
between T568A and T568B is
A. Difference in wire color
B. Difference in number of wires
C. Just different length of wires
D. Just different
manufacturer standards
4-10. The meaning of Straight-through
Cable is
A. Four wire pairs connect
to the same pin on each end
B. The cable Which Directly connects Computer to Computer
C. Four wire pairs not twisted with each other
D. The cable which is not twisted
Answers
1 – D / 2 – B / 3 – C / 4 – B / 5 – A / 6 – B / 7 – D / 8 – C /
9 – D / 10 – A
5-1 Which of the
following is not the External Security Threats?
A. Front-door Threats
B. Back-door Threats
C. Underground Threats
D. Denial of Service (DoS)
5-2 What is the
Demilitarized Zone?
A. The area between
firewall & connection to an external network
B. The area between ISP to Military area
C. The area surrounded by secured servers
D. The area surrounded by the Military
5-3 What is the full
form of RAID ?
A. Redundant Array of
Independent Disks
B. Redundant Array of Important Disks
C. Random Access of Independent Disks
D. Random Access of Important Disks
5-4 What is the
maximum header size of an IP packet?
A. 32 bytes
B. 64 bytes
C. 30 bytes
D. 60 bytes
5-5 What is the size of
Host bits in Class B of IP address?
A. 04
B. 08
C. 16
D. 32
5-6 What is the usable
size of Network bits in Class B of IP address?
A. 04
B. 08
C. 14
D. 16
5-7 In which type of
RAID, data is mirrored between two disks.
A. RAID 0
B. RAID 1
C. RAID 2
D. RAID 3
5-8 What do you mean
by broadcasting in Networking?
A. It means addressing a
packet to all machine
B. It means addressing a packet to some machine
C. It means addressing a packet to a particular machine
D. It means addressing a packet to except a particular machine
5-9 Which of the
following is/are Protocols of Application?
A. FTP
B. DNS
C. Telnet
D. All of above
5-10 Which of the
following protocol is/are defined in Transport layer?
A. FTP
B. TCP
C. UDP
D. B & C
Answers
1 – C / 2 – A / 3 – A / 4 – D / 5 – C / 6 – C / 7 – B / 8 – A /
9 – D / 10 – D
Networking Basics - Networking Basics
·
Networking Basics -
Networking Basics
1.
|
How long is an IPv6 address?
|
|
|
32
bits
|
|
|
128
bytes
|
|
|
64
bits
|
|
|
128
bits
|
Answer: Option D
Explanation:
An IPv6 address is 128 bits long.
|
2.
|
What flavor of Network Address
Translation can be used to have one IP address allow many users to connect to
the global Internet?
|
|
Answer: Option D
Explanation:
Port Address Translation (PAT)
allows a one-to-many approach to network address translation.
|
3.
|
What are the two main types of
access control lists (ACLs)?
1.
Standard
2.
IEEE
3.
Extended
4.
Specialized
|
|
|
1
and 3
|
|
|
2
and 4
|
|
|
3
and 4
|
|
|
1
and 2
|
Answer: Option A
Explanation:
Standard and extended access
control lists (ACLs) are used to configure security on a router.
|
4.
|
What command is used to create a
backup configuration?
|
|
|
copy running backup
|
|
|
Copy running-config startup-config
|
|
|
config mem
|
|
|
wr mem
|
Answer: Option B
Explanation:
The command to back up the
configuration on a router is copy running-config startup-config.
|
5.
|
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?
|
|
|
100
kbps
|
|
|
1
Mbps
|
|
|
2
Mbps
|
|
|
10
Mbps
|
Answer: Option D
Explanation:
Each device has 10 Mbps to the
server.
|
6.
|
Which WLAN IEEE specification
allows up to 54Mbps at 2.4GHz?
|
|
Answer: Option C
Explanation:
IEEE 802.11B is 2.4GHz, but with a
maximum of only 11Mbps. IEEE 802.11G is in the 2.4GHz range, with a top speed
of 54Mbps.
|
7.
|
Which of the following is the
valid host range for the subnet on which the IP address 192.168.168.188
255.255.255.192 resides?
|
|
|
192.168.168.129-190
|
|
|
192.168.168.129-191
|
|
|
192.168.168.128-190
|
|
|
192.168.168.128-192
|
Answer: Option A
Explanation:
256 - 192 = 64. 64 + 64 = 128. 128
+ 64 = 192. The subnet is 128, the broadcast address is 191, and the valid
host range is the numbers in between, or 129-190.
|
8.
|
To back up an IOS, what command
will you use?
|
|
|
backup IOS disk
|
|
|
copy ios tftp
|
|
|
copy tftp flash
|
|
|
copy flash tftp
|
Answer: Option D
Explanation:
The command copy flash tftp will prompt you to back up an existing IOS in flash to a
TFTP host.
|
9.
|
What protocol does PPP use to
identify the Network layer protocol?
|
|
Answer: Option A
Explanation:
Network Control Protocol is used
to help identify the Network layer protocol used in the packet.
|
10.
|
Which of the following commands
will allow you to set your Telnet password on a Cisco router?
|
|
|
line telnet 0 4
|
|
|
line aux 0 4
|
|
|
line vty 0 4
|
|
|
line con 0
|
Answer: Option C
Explanation:
The command line vty 0 4 places you in a prompt that will allow you to set or
change your Telnet password
|
11.
|
Which protocol does DHCP use at
the Transport layer?
|
|
Answer: Option C
Explanation:
User Datagram Protocol is a
connection network service at the Transport layer, and DHCP uses this connectionless
service.
|
12.
|
Which command is used to determine
if an IP access list is enabled on a particular interface?
|
|
|
show access-lists
|
|
|
show interface
|
|
|
show ip interface
|
|
|
show interface access-lists
|
Answer: Option C
Explanation:
The show
ip interface command will show you if any outbound or inbound
interfaces have an access list set.
|
13.
|
Where is a hub specified in the
OSI model?
|
|
|
Session
layer
|
|
|
Physical
layer
|
|
|
Data
Link layer
|
|
|
Application
layer
|
Answer: Option B
Explanation:
Hubs regenerate electrical
signals, which are specified at the Physical layer.
|
14.
|
What does the passive command
provide to dynamic routing protocols?
|
|
|
Stops
an interface from sending or receiving periodic dynamic updates.
|
|
|
Stops
an interface from sending periodic dynamic updates but not from receiving
updates.
|
|
|
Stops
the router from receiving any dynamic updates.
|
|
|
Stops
the router from sending any dynamic updates.
|
Answer: Option B
Explanation:
The passive command, short for passive-interface, stops regular updates
from being sent out an interface. However, the interface can still receive
updates.
|
15.
|
Which protocol is used to send a
destination network unknown message back to originating hosts?
|
|
Answer: Option C
Explanation:
ICMP is the protocol at the
Network layer that is used to send messages back to an originating router.
16.
|
How
often are BPDUs sent from a layer 2 device?
|
|
|
Never
|
|
|
Every
2 seconds
|
|
|
Every
10 minutes
|
|
|
Every
30 seconds
|
Answer: Option B
Explanation:
Every
2 seconds, BPDUs are sent out from all active bridge ports by default.
|
17.
|
How
many broadcast domains are created when you segment a network with a
12-port switch?
|
|
Answer: Option A
Explanation:
By
default, switches break up collision domains but are one large broadcast
domain.
|
18.
|
What
does the command routerA(config)#line cons 0 allow you to perform next?
|
|
|
Set
the Telnet password.
|
|
|
Shut
down the router.
|
|
|
Set
your console password.
|
|
|
Disable
console connections.
|
Answer: Option C
Explanation:
The
command line console 0 places you at a prompt where you can then set your
console user-mode password.
|
19.
|
Which
router command allows you to view the entire contents of all access lists?
|
|
|
show all access-lists
|
|
|
show access-lists
|
|
|
show ip interface
|
|
|
show interface
|
Answer: Option B
Explanation:
To
see the contents of all access lists, use the show access-lists command.
|
20.
|
Which
class of IP address has the most host addresses available by default?
|
|
Answer: Option A
Explanation:
Class
A addressing provides 24 bits for host addressing.
|
|
21.
|
In a network with dozens of
switches, how many root bridges would you have?
|
|
Answer: Option A
Explanation:
You should have only one root
bridge per network.
|
22.
|
What PPP protocol provides dynamic
addressing, authentication, and multilink?
|
|
Answer: Option C
Explanation:
Link Control Protocol in the PPP
stack provides dynamic addressing, authentication, and multilink.
|
23.
|
What is a stub network?
|
|
|
A
network with more than one exit point.
|
|
|
A
network with more than one exit and entry point.
|
|
|
A
network with only one entry and no exit point.
|
|
|
A
network that has only one entry and exit point.
|
Answer: Option D
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.
|
24.
|
If your router is facilitating a
CSU/DSU, which of the following commands do you need to use to provide the
router with a 64000bps serial link?
|
|
|
RouterA(config)#bandwidth 64
|
|
|
RouterA(config-if)#bandwidth 64000
|
|
|
RouterA(config-if)#clock rate 64
|
|
|
RouterA(config-if)#clock rate 64000
|
Answer: Option D
Explanation:
The clock
rate command is two words, and the speed of the line is in bps.
|
25.
|
Which one of the following is true
regarding VLANs?
|
|
|
Two
VLANs are configured by default on all Cisco switches.
|
|
|
VLANs
only work if you have a complete Cisco switched internetwork. No off-brand
switches are allowed.
|
|
|
You
should not have more than 10 switches in the same VTP domain.
|
|
|
VTP
is used to send VLAN information to switches in a configured VTP domain.
|
Answer: Option D
Explanation:
Switches do not propagate VLAN
information by default; you must configure the VTP domain. VLAN Trunking
Protocol (VTP) is used to propagate VLAN information across a trunk link.
|
26.
|
What does a VLAN do?
|
|
|
Acts
as the fastest port to all servers.
|
|
|
Provides
multiple collision domains on one switch port.
|
|
|
Breaks
up broadcast domains in a layer 2 switch internetwork.
|
|
|
Provides
multiple broadcast domains within a single collision domain.
|
Answer: Option C
Explanation:
VLANs break up broadcast domains
at layer 2.
|
27.
|
What is the main reason the OSI
model was created?
|
|
|
To
create a layered model larger than the DoD model.
|
|
|
So
application developers can change only one layer's protocols at a time.
|
|
|
So
different networks could communicate.
|
|
|
So
Cisco could use the model.
|
Answer: Option C
Explanation:
The primary reason the OSI model
was created was so that different networks could inter-operate.
|
28.
|
How many collision domains are created
when you segment a network with a 12-port switch?
|
|
Answer: Option D
Explanation:
Layer 2 switching creates
individual collision domains.
|
29.
|
What command will display the
line, protocol, DLCI, and LMI information of an interface?
|
|
|
sh pvc
|
|
|
show interface
|
|
|
show frame-relay pvc
|
|
|
show run
|
Answer: Option B
Explanation:
The show
interface command shows the line, protocol, DLCI, and LMI
information of an interface.
|
30.
|
Which protocol does Ping use?
|
|
Answer: Option C
Explanation:
ICMP is the protocol at the
Network layer that is used to send echo requests and replies.
|
31. What protocols are used to
configure trunking on a switch?
1.
VLAN Trunking
Protocol
2.
VLAN
3.
802.1Q
4.
ISL
|
|
|
1
and 2
|
|
|
3
and 4
|
|
|
1
only
|
|
|
2
only
|
Answer: Option B
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.
|
| 1. |
How many digits of the DNIC (Data Network Identification Code) identify the country?
|
| A. | first three |
| B. | first four |
| C. | first five |
| D. | first six |
| E. | None of the above |
|
