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
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
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
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
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
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
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
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
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
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)
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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)
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
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
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
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
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
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
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
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
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
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? | |||||||
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 | |||||||
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? | |||||||
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? | |||||||
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? | |||||||
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? | |||||||
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? | |||||||
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? | |||||||
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? | |||||||
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? | |||||||
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.
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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? | |||||||
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? | |||||||
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? | |||||||
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? | |||||||
Answer: Option C Explanation: VLANs break up broadcast domains at layer 2. |
27. | What is the main reason the OSI model was created? | |||||||
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? | |||||||
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 | |||||||||
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? | |||||||||
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| 2. | A station in a network forwards incoming packets by placing them on its shortest output queue. What routing algorithm is being used? | |||||||||
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| 3. | The probability that a single bit will be in error on a typical public telephone line using 4800 bps modem is 10 to the power -3. If no error detection mechanism is used, the residual error rate for a communication line using 9-bit frames is approximately equal to | |||||||||
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| 4. | Frames from one LAN can be transmitted to another LAN via the device | |||||||
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