Computer Networking MCQs

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Computer Networking MCQs

Practice Computer Networking MCQs covering LAN, MAN, WAN, PAN, topology, modem, router, hub, switch and IP address concepts.

325
Total Questions

Practice Questions

Page 9 of 17
Question #161
What is the function of a DNS cache?
A. Stores routing tables
B. Stores IP address mappings
C. Stores MAC addresses
D. Stores recently resolved domain names for faster lookup
Discuss
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Correct Answer: Option D

Explanation:
DNS caching speeds up resolution by storing previous queries.
This question belongs to: Computer Computer Networking
Question #162
Which device is used to convert digital signals to analog for transmission over a cable network?
A. DSL modem
B. Router
C. Cable modem
D. Switch
Discuss
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Correct Answer: Option C

Explanation:
A cable modem is used for cable internet, converting digital data for transmission over coaxial cable.
This question belongs to: Computer Computer Networking
Question #163
What is the network ID in an IP address?
A. The portion of the IP address that identifies the network
B. The portion that identifies the host
C. The subnet mask
D. The broadcast address
Discuss
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Correct Answer: Option A

Explanation:
The network ID is the part of the IP address that remains constant for all devices in the same network.
This question belongs to: Computer Computer Networking
Question #164
Which of the following is a connectionless protocol at the transport layer?
A. TCP
B. UDP
C. IGMP
D. ICMP
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Correct Answer: Option B

Explanation:
UDP is connectionless; it sends datagrams without establishing a connection.
This question belongs to: Computer Computer Networking
Question #165
What is the maximum data rate of Fast Ethernet?
A. 100 Mbps
B. 1 Gbps
C. 10 Mbps
D. 10 Gbps
Discuss
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Correct Answer: Option A

Explanation:
Fast Ethernet (100BASE-T) operates at 100 Mbps.
This question belongs to: Computer Computer Networking
Question #166
Which of the following is a dynamic routing protocol?
A. Default routing
B. OSPF
C. Routing table
D. Static routing
Discuss
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Correct Answer: Option B

Explanation:
OSPF (Open Shortest Path First) is a dynamic routing protocol that automatically adapts to network changes.
This question belongs to: Computer Computer Networking
Question #167
What is the function of a network gateway?
A. To filter traffic based on MAC
B. To connect networks with different protocols
C. To assign IP addresses
D. To amplify signals
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Correct Answer: Option B

Explanation:
Gateways translate between different network protocols, serving as an entry to another network.
This question belongs to: Computer Computer Networking
Question #168
Which of the following is a disadvantage of a star topology?
A. If the central hub fails, the network fails
B. Expensive cabling compared to bus
C. Difficult to add new devices
D. Low data rates
Discuss
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Correct Answer: Option A

Explanation:
Star topology relies on a central device; its failure disables the whole network.
This question belongs to: Computer Computer Networking
Question #169
What is the purpose of the ARP cache?
A. To store DHCP leases
B. To store recently resolved IP-to-MAC mappings
C. To store routing tables
D. To store DNS records
Discuss
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Correct Answer: Option B

Explanation:
ARP cache holds IP-to-MAC address mappings to reduce ARP requests.
This question belongs to: Computer Computer Networking
Question #170
Which of the following is a multi-point topology?
A. Ring
B. All of the above
C. Star
D. Bus
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Correct Answer: Option B

Explanation:
All these topologies have multiple devices sharing a medium or central point.
This question belongs to: Computer Computer Networking
Question #171
What is the default protocol for secure web browsing?
A. HTTPS
B. FTP
C. HTTP
D. SSH
Discuss
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Correct Answer: Option A

Explanation:
HTTPS is the secure version of HTTP, using SSL/TLS encryption.
This question belongs to: Computer Computer Networking
Question #172
Which device is used to connect multiple computers in a LAN and does not require processing?
A. Firewall
B. Hub
C. Switch
D. Router
Discuss
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Correct Answer: Option B

Explanation:
A hub is a simple device that repeats signals without intelligent processing.
This question belongs to: Computer Computer Networking
Question #173
What is the subnet mask for a Class B network?
A. 255.0.0.0
B. 255.255.255.0
C. 255.255.255.255
D. 255.255.0.0
Discuss
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Correct Answer: Option D

Explanation:
Class B default subnet mask is 255.255.0.0 (16 bits for network).
This question belongs to: Computer Computer Networking
Question #174
Which protocol is used to manage multicast group memberships?
A. ICMP
B. IGMP
C. ARP
D. DHCP
Discuss
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Correct Answer: Option B

Explanation:
IGMP (Internet Group Management Protocol) manages multicast group memberships.
This question belongs to: Computer Computer Networking
Question #175
What is the maximum number of subnets available in a Class C network with a /27 subnet mask?
A. 8
B. 16
C. 32
D. 4
Discuss
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Correct Answer: Option A

Explanation:
Class C default /24, /27 borrows 3 bits, giving 2^3 = 8 subnets.
This question belongs to: Computer Computer Networking
Question #176
Which network topology is used in early Ethernet networks with coaxial cable?
A. Star
B. Mesh
C. Bus
D. Ring
Discuss
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Correct Answer: Option C

Explanation:
Early Ethernet used a bus topology with coaxial cable (thicknet/thinnet).
This question belongs to: Computer Computer Networking
Question #177
What is the role of a proxy server in network security?
A. To provide physical connectivity
B. To hide internal network structure and filter traffic
C. To route packets
D. To assign IP addresses
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Correct Answer: Option B

Explanation:
Proxies act as intermediaries, hiding client identities and filtering content.
This question belongs to: Computer Computer Networking
Question #178
Which of the following is a characteristic of a hub?
A. Creates separate collision domains
B. Works at layer 2
C. Broadcasts data to all ports
D. Forwards data based on MAC addresses
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Correct Answer: Option C

Explanation:
A hub broadcasts incoming traffic to all other ports.
This question belongs to: Computer Computer Networking
Question #179
What is the purpose of a VLAN trunk?
A. To filter traffic
B. To carry traffic for multiple VLANs over a single link
C. To connect to the Internet
D. To assign IP addresses
Discuss
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Correct Answer: Option B

Explanation:
Trunk links carry tagged frames for multiple VLANs between switches.
This question belongs to: Computer Computer Networking
Question #180
Which protocol is used to send error messages and operational information?
A. TCP
B. HTTP
C. UDP
D. ICMP
Discuss
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Correct Answer: Option D

Explanation:
ICMP is used for error reporting (e.g., unreachable host) and diagnostics.
This question belongs to: Computer Computer Networking

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