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Computer Networks

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ThirdYear Third Year Quiz on Computer Networks, created by Faheem Ahmed on 18/10/2017.
Faheem Ahmed
Quiz by Faheem Ahmed, updated more than 1 year ago
Faheem Ahmed
Created by Faheem Ahmed about 7 years ago
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Resource summary

Question 1

Question
An IPv4 address is _________ bits.
Answer
  • 8
  • 16
  • 32
  • 64

Question 2

Question
What is the class of the address 200.66.10.21?
Answer
  • A
  • B
  • C
  • D

Question 3

Question
What is the hostid of the address 12.11.1.21?
Answer
  • 11.1.21
  • 1.21
  • 21
  • None

Question 4

Question
What is the address of the network to which the host 130.8.119.1 is connected ?
Answer
  • 130.8.119.0
  • 130.8.0.0
  • 130.0.0.0
  • None

Question 5

Question
Which error detection method involves polynomials?
Answer
  • VRC
  • LRC
  • CRC
  • checksum

Question 6

Question
In cyclic redundancy checking, the divisor is _______the CRC.
Answer
  • the same size as
  • one bit less than
  • one bit more than
  • two bits more than

Question 7

Question
IPV6 address has ____________ bits.
Answer
  • 32
  • 64
  • 128
  • 256

Question 8

Question
What is the maximum number of IP addresses that can be assigned to hosts on a local subnet that uses the 255.255.255.224 subnet mask?
Answer
  • 16
  • 32
  • 62
  • 30

Question 9

Question
You need to subnet a network that has 5 subnets, each with at least 16 hosts. Which will be your choice?
Answer
  • 255.255.255.192
  • 255.255.255.224
  • 255.255.255.240
  • 255.255.255.248

Question 10

Question
Which protocol does Ping use?
Answer
  • TCP
  • ARP
  • ICMP
  • DHCP

Question 11

Question
Which class of IP address provides a maximum of only 254 host addresses per network ID?
Answer
  • A
  • B
  • C
  • D
  • E

Question 12

Question
Which of the following devices takes data sent from one network device and forwards it to the destination node based on MAC address?
Answer
  • Hub
  • Switch
  • Router
  • Bridge

Question 13

Question
HUB is a _________ Device and Switch is a ________ Device.
Answer
  • Unicast, Multicast
  • Multicast, Unicast
  • Broadcast, Unicast
  • Unicast, Broadcast

Question 14

Question
The last address of IP address represents
Answer
  • Unicast address
  • Network address
  • Broadcast address
  • Multicast address

Question 15

Question
DNS stands for
Answer
  • Dynamic Name System
  • Dynamic Network System
  • Domain Name System
  • Domain Network Service

Question 16

Question
What is the size of MAC address?
Answer
  • 16 bits
  • 32 bits
  • 48 bits
  • 64 bits

Question 17

Question
What is the size of host bits in Class B of IP address?
Answer
  • 4
  • 8
  • 16
  • 32

Question 18

Question
What is the usable size of network bits in Class B of IP address?
Answer
  • 4
  • 8
  • 14
  • 16

Question 19

Question
Which of the following is/are protocols of Application?
Answer
  • FTP
  • DNS
  • Telnet
  • All the above.

Question 20

Question
Default administrative distance of Static Route
Answer
  • 0
  • 1
  • 10
  • 90
  • 100

Question 21

Question
Which protocol working at the Transport layer provides a connectionless service between hosts?
Answer
  • IP
  • ARP
  • TCP
  • UDP

Question 22

Question
What protocol is used to find the hardware address of a local device?
Answer
  • DNS
  • ARP
  • IP
  • ICMP

Question 23

Question
A router ?
Answer
  • forwards a packet to all outgoing links.
  • forwards a packet to all outgoing links, except the link upon which the packet originated
  • forwards a packet to the next free outgoing link
  • determines on which outgoing link a packet is to be forwarded.

Question 24

Question
Which command does not show that two devices are failing to route packets between them successfully?
Answer
  • show interface
  • trace
  • telnet
  • ping

Question 25

Question
Which of the following ranges are considered well-known port numbers?
Answer
  • 1–1023
  • 1024 and above
  • 1–256
  • 1–65534

Question 26

Question
Which protocol does DHCP use at the Transport layer?
Answer
  • IP
  • TCP
  • UDP
  • ARP

Question 27

Question
Which class of IP address has the most host addresses available by default?
Answer
  • A
  • B
  • C
  • D

Question 28

Question
What does the command ip route 192.168.50.0 255.255.255.0 10.2.1.3 specify?
Answer
  • The router should use network 192.168.50.0 to get to address 10.2.1.3
  • Both 192.168.50.0 and 10.2.1.3 use a mask of 255.255.255.0
  • You want the router to trace a route to network 192.168.50.0 via 10.2.1.3
  • The router should use address 10.2.1.3 to get to devices on network 192.168.50.0

Question 29

Question
Match the following: A. Repeaters 1. Data Link Layer B. Bridges 2. Network Layer C. Routers 3. Physical Layer
Answer
  • A --->2, B--->3, C--->1
  • A--->3, B---->1, C---->2
  • A--->3, B----->2, C---->1
  • A---->1, B---->2, C---->3

Question 30

Question
Which of the following is true of a Switch?
Answer
  • Switches forward packets based on IP address.
  • Switches forward packets based on MAC address.
  • Switches forward packets based on IPX address.
  • Switches forward packets based on Layer 3 address.

Question 31

Question
A client workstation is connected to a DHCP server through a switch and a router, The client machine has been able to access the network resources without any problem. However, after the recent configuration change on the DHCP server, the client workstation is not able to access any network resources. What is the likely solution.
Answer
  • Clear arp cache on the router
  • Use ipconfig command with /release and /renew options
  • Reset switch MAC address table
  • Issue a tracert command to DHCP server

Question 32

Question
Match the following: 1. Segments A. Data Link Layer 2. Packets B. Network Layer 3. Frames C. Transport Layer
Answer
  • 1--->A; 2---->C; 3 --->B
  • 1--->C; 2---->A; 3 --->B
  • 1--->C; 2---->B; 3 --->A
  • 1--->A; 2---->B; 3 --->C

Question 33

Question
Which of the following statements are true regarding the command ip route 172.16.4.0 255.255.255.0 192.168.4.2? 1. The command is used to establish a static route. 2. The default administrative distance is used. 3. The command is used to configure the default route. 4. The subnet mask for the source address is 255.255.255.0.
Answer
  • 1 and 2
  • 2 and 4
  • 3 and 4
  • All of the above

Question 34

Question
If your routing table has a static, a RIP, and an IGRP route to the same network, which route will be used to route packets by default?
Answer
  • Any available route
  • RIP route
  • Static route
  • IGRP route
  • They will all load-balance.

Question 35

Question
A network administrator views the output from the show ip route command. A network that is advertised by both RIP and IGRP appears in the routing table flagged as an IGRP route. Why is the RIP route to this network not used in the routing table?
Answer
  • IGRP has a faster update timer.
  • IGRP has a lower administrative distance.
  • RIP has a higher metric value for that route.
  • The IGRP route has fewer hops.

Question 36

Question
Start and stop bits are used in serial communication for
Answer
  • Error detection
  • Error correction
  • Synchronization
  • Slowing down the communication

Question 37

Question
How many Character per sec (7bits + 1parity) can be transmitted over a 2400 bps line if the transfer is synchronous (1 "Start" and 1 "stop" bit)?
Answer
  • 300
  • 240
  • 250
  • 24

Question 38

Question
The Network topology that supports bi-directional links between each possible node is
Answer
  • Ring
  • Star
  • Tree
  • Mesh

Question 39

Question
In a broad Sense, a railway track is an example of
Answer
  • Simplex
  • Half Duplex
  • Full Duplex
  • All of these

Question 40

Question
If one link fails, only that link is affected. All other links remain active. Which topology does this?
Answer
  • Mesh topology
  • Star topology
  • Bus topology
  • Physical topology

Question 41

Question
Which command would you place on interface connected to the Internet?
Answer
  • ip nat inside
  • ip nat outside
  • ip outside global
  • ip inside local

Question 42

Question
Which command would you place on interface on a private network?
Answer
  • ip nat inside
  • ip nat outside
  • ip outside global
  • ip inside local

Question 43

Question
What is the administrative distance of OSPF?
Answer
  • 90
  • 100
  • 110
  • 120

Question 44

Question
Which three commands can be used to check LAN connectivity problems on a router? (Select THREE )
Answer
  • show interfaces
  • show ip route
  • tracert
  • ping
  • dns lookups

Question 45

Question
You have an interface on a router with the IP address of 192.168.192.10/29. Including the router interface, how many hosts can have IP addresses on the LAN attached to the router interface?
Answer
  • 6
  • 8
  • 30
  • 32

Question 46

Question
What is the sub network number of a host with an IP address of 172.16.66.0/21?
Answer
  • 172.16.36.0
  • 172.16.48.0
  • 172.16.64.0
  • 172.16.0.0

Question 47

Question
The network address of 172.16.0.0/19 provides how many subnets and hosts?
Answer
  • 7 subnets, 30 hosts each
  • 8 subnets, 8,190 hosts each
  • 8 subnets, 2,046 hosts each
  • 7 subnets, 2,046 hosts each

Question 48

Question
On a VLSM network, which mask should you use on point-to-point WAN links in order to reduce the waste of IP addresses?
Answer
  • /27
  • /28
  • /29
  • /30

Question 49

Question
When data is encapsulated, which is the correct order?
Answer
  • Data, frame, packet, segment, bit
  • Segment, data, packet, frame, bit
  • Data, segment, packet, frame, bit
  • Data, segment, frame, packet, bit

Question 50

Question
If you use either Telnet or FTP, which is the highest layer you are using to transmit data?
Answer
  • Application
  • Presentation
  • Session
  • Transport
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