Computer Networks MCQ Questions and Answers with PDF Download is offered here so that you can prepare your exams better and score good marks for this chapter. Computer networks is one of the most important chapter for any candidate pursuing career in information technology field. Having solid background information and a good practice with quality MCQ questions enables you to score highest in any competitive examination. Don't forget to download the PDF file so that you can practice while you're offline.
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Computer Networks MCQ Questions
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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
2. 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
3. Two devices are in network if
A. a process in one device is able to exchange information with a process in another device
B. a process is running on both devices
C. PIDs of the processes running of different devices are same
D. none of the mentioned
4. 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
5. The IETF standards documents are called
A. RFC
B. RCF
C. ID
D. None of the mentioned
6. 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
7. Each IP packet must contain
A. Only Source address
B. Only Destination address
C. Source and Destination address
D. Source or Destination address
8. What is the minimum header size of an IP packet?
A. 16 bytes
B. 10 bytes
C. 20 bytes
D. 32 bytes
9. 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
10. 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)
11. What is the IP Address range of APIPA?
A. 169.254.0.1 to 169.254.0.254
B. 169.254.0.1 to 169.254.0.255
C. 169.254.0.1 to 169.254.255.254
D. 169.254.0.1 to 169.254.255.255
12. Which of the following is not the possible ways of data exchange?
A. Simplex
B. Multiplex
C. Half-duplex
D. Full-duplex
13. The management of data flow between computers or devices or between nodes in a network is called
A. Flow control
B. Data Control
C. Data Management
D. Flow Management
14. What does the port number in a TCP connection specify?
A. It specifies the communication process on the two end systems
B. It specifies the quality of the data & connection
C. It specify the size of data
D. All of the above
15. What is the purpose of the PSH flag in the TCP header?
A. Typically used to indicate end of message
B. Typically used to indicate beginning of message
C. Typically used to push the message
D. Typically used to indicate stop the message
16. Which of the following protocol is/are defined in Transport layer?
A. FTP
B. TCP
C. UDP
D. B & C
17. 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
18. What is the size of MAC Address?
A. 16-bits
B. 32-bits
C. 48-bits
D. 64-bits
19. Repeater operates in which layer of the OSI model?
A. Physical layer
B. Data link layer
C. Network layer
D. Transport layer
20. 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
21. 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)
22. 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
23. How many layers does OSI Reference Model has?
A. 4
B. 5
C. 6
D. 7
24 Bridge works in which layer of the OSI model?
A. Appliation layer
B. Transport layer
C. Network layer
D. Datalink layer
25. 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
26. What is the benefit of the Networking?
A. File Sharing
B. Easier access to Resources
C. Easier Backups
D. All of the Above
27. Which of the following is not the Networking Devices?
A. Gateways
B. Linux
C. Routers
D. Firewalls
28. What is the maximum header size of an IP packet?
A. 32 bytes
B. 64 bytes
C. 30 bytes
D. 60 bytes
29. Which of the following is correct in VLSM?
A. Can have subnets of different sizes
B. Subnets must be in same size
C. No required of subnet
D. All of above
30. DHCP Server provides _____ to the client.
A. Protocol
B. IP Address
C. MAC Address
D. Network Address
31. What is the address size of IPv6 ?
A. 32 bit
B. 64 bit
C. 128 bit
D. 256 bit
32. 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
33. 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
34. 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
35. What is the size of Source and Destination IP address in IP header?
A. 4 bits
B. 8 bits
C. 16 bits
D. 32 bits
36. What is the typical range of Ephemeral ports?
A. 1 to 80
B. 1 to 1024
C. 80 to 8080
D. 1024 to 65535
37. A set of rules that govern all aspects of information communication is called
A. Server
B. Internet
C. Protocol
D. OSI Model
38. Controlling access to a network by analyzing the incoming and outgoing packets is called
A. IP Filtering
B. Data Filtering
C. Packet Filtering
D. Firewall Filtering
39. 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
40. 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
41. Network congestion occurs
A. in case of traffic overloading
B. when a system terminates
C. when connection between two nodes terminates
D. none of the mentioned
42. 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
43 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
44. ............provides a connection-oriented reliable service for sending messages
A. TCP
B. IP
C. UDP
D. All of the above
45. 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
46. 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
47. What is the size of Host bits in Class B of IP address?
A. 04
B. 08
C. 16
D. 32
48. Which of the following is correct in CIDR?
A. Class A includes Class B network
B. There are only two networks
C. There are high & low class network
D. There is no concept of class A, B, C networks
49. The processes on each machine that communicate at a given layer are called
A. UDP process
B. Intranet process
C. Server technology
D. Peer-peer process
50. Which of the following layer is not network support layer?
A. Transport Layer
B. Network Layers
C. Data link Layer
D. Physical Layer
Correct Answers of Computer Networks MCQ Questions
| 1-D | 2-A | 3-A | 4-C | 5-A | 6-C | 7-C | 8-C | 9-D | 10-C |
| 11-C | 12-B | 13-A | 14-A | 15-A | 16-D | 17-A | 18-C | 19-A | 20-D |
| 21-B | 22-D | 23-D | 24-D | 25-D | 26-D | 27-B | 28-D | 29-A | 30-B |
| 31-C | 32-A | 33-A | 34-A | 35-D | 36-D | 37-C | 38-C | 39-B | 40-A |
| 41-A | 42-A | 43-A | 44-A | 45-C | 46-A | 47-C | 48-D | 49-D | 50-A |
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