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 10 of 17
Question #181
What is the main advantage of a mesh topology?
A. Low cost
B. Easy to install
C. High redundancy
D. Simple cabling
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Correct Answer: Option C

Explanation:
Mesh provides multiple paths, ensuring high fault tolerance.
This question belongs to: Computer Computer Networking
Question #182
Which of the following is a port used by DNS?
A. 25
B. 80
C. 53
D. 443
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Correct Answer: Option C

Explanation:
DNS uses port 53 (both TCP and UDP).
This question belongs to: Computer Computer Networking
Question #183
What is the function of a router's ARP table?
A. Stores DHCP leases
B. Stores routing information
C. Stores mappings between IP addresses and MAC addresses
D. Stores DNS records
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Correct Answer: Option C

Explanation:
The ARP table on a router caches IP-to-MAC mappings for local devices.
This question belongs to: Computer Computer Networking
Question #184
Which topology is commonly used for fiber-optic networks?
A. Ring
B. Bus
C. Star
D. Mesh
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Correct Answer: Option C

Explanation:
Fiber-optic networks often use star topology with active switches or hubs.
This question belongs to: Computer Computer Networking
Question #185
What is the purpose of the OSI model?
A. To assign IP addresses
B. To route packets
C. To provide security
D. To standardize network communication
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Correct Answer: Option D

Explanation:
The OSI model provides a framework for understanding and standardizing network protocols.
This question belongs to: Computer Computer Networking
Question #186
Which type of network topology requires a central controller or hub to connect all peripheral nodes, making the entire network dependent on that single central device?
A. Bus Topology
B. Star Topology
C. Mesh Topology
D. Ring Topology
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Correct Answer: Option B

Explanation:
In a star topology, each network host is connected to a central hub or switch. If the central device fails, the whole network goes down.
This question belongs to: Computer Computer Networking
Question #187
An IPv4 address is composed of how many bits, and how are they typically formatted for human readability?
A. 16 bits, divided into two bytes separated by hyphens
B. 128 bits, formatted as hexadecimal characters
C. 64 bits, divided into eight blocks separated by colons
D. 32 bits, divided into four octets separated by dots
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Correct Answer: Option D

Explanation:
An IPv4 address consists of 32 bits arranged into four 8-bit octets, represented in dotted-decimal format (e.g., 192.168.1.1).
This question belongs to: Computer Computer Networking
Question #188
Which networking device operates at the Data Link Layer (Layer 2) and uses MAC addresses to filter and forward data packets only to the specific destination port?
A. Switch
B. Router
C. Hub
D. Repeater
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Correct Answer: Option A

Explanation:
A network switch is an intelligent Layer 2 device that learns MAC addresses and routes traffic exclusively to the intended device, unlike a hub which broadcasts to all ports.
This question belongs to: Computer Computer Networking
Question #189
What type of network geographic classification covers a single room, home, or office building, typically utilizing Wi-Fi or Ethernet cables?
A. MAN (Metropolitan Area Network)
B. WAN (Wide Area Network)
C. PAN (Personal Area Network)
D. LAN (Local Area Network)
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Correct Answer: Option D

Explanation:
A Local Area Network (LAN) spans a small, restricted geographical area like a single school, residence, or office space.
This question belongs to: Computer Computer Networking
Question #190
Which device is responsible for modulating digital computer signals into analog waves for transmission over traditional telephone lines, and demodulating them back?
A. Bridge
B. Gateway
C. Modem
D. Router
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Correct Answer: Option C

Explanation:
A modem (Modulator-Demodulator) converts digital signals from a computer into analog signals for communication cables, and vice versa.
This question belongs to: Computer Computer Networking
Question #191
Which network topology provides the highest level of redundancy and fault tolerance by physically connecting every individual node directly to every other node?
A. Full Mesh Topology
B. Bus Topology
C. Tree Topology
D. Star Topology
Discuss
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Correct Answer: Option A

Explanation:
In a full mesh topology, every node has a point-to-point connection to every other node, ensuring multiple alternative pathways if a link fails.
This question belongs to: Computer Computer Networking
Question #192
What is the primary function of a Router in a computer network ecosystem?
A. To convert analog signals directly into serial bitstreams.
B. To connect distinct networks and route data packets based on logical IP addresses.
C. To regenerate weak signals across long cable lengths.
D. To act as a physical patch panel for structural wiring.
Discuss
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Correct Answer: Option B

Explanation:
Routers operate at the Network Layer (Layer 3) and use IP addresses to determine the optimal path for forwarding data packets across different networks.
This question belongs to: Computer Computer Networking
Question #193
Wireless technologies like Bluetooth or Zigbee, which connect personal gadgets within a short range around an individual, form which network category?
A. MAN
B. WAN
C. PAN
D. LAN
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Correct Answer: Option C

Explanation:
A Personal Area Network (PAN) centers around an individual's workspace, typically covering a range of less than 10 meters.
This question belongs to: Computer Computer Networking
Question #194
Which of the following is an example of a Class C IP address based on the traditional classful addressing scheme?
A. 172.16.254.1
B. 240.0.0.1
C. 10.0.0.5
D. 192.168.1.50
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Correct Answer: Option D

Explanation:
Class C IP addresses have a first octet range spanning from 192 to 223, commonly used for small local area networks.
This question belongs to: Computer Computer Networking
Question #195
Why is a basic network Hub often called a 'dumb' device compared to a modern network Switch?
A. It cannot understand digital binary configurations.
B. It lacks internal power supplies.
C. It cannot transmit data wirelessly.
D. It broadcasts all incoming data packets out to every connected port, causing collision issues.
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Correct Answer: Option D

Explanation:
A hub operates at the Physical Layer (Layer 1) and simply repeats incoming signals to all ports, increasing network collisions and security vulnerabilities.
This question belongs to: Computer Computer Networking
Question #196
A network that spans an entire city or a large university campus, linking multiple localized networks together, falls under which category?
A. LAN
B. PAN
C. WAN
D. MAN
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Correct Answer: Option D

Explanation:
A Metropolitan Area Network (MAN) is larger than a LAN but smaller than a WAN, typically spanning a city block or urban community footprint.
This question belongs to: Computer Computer Networking
Question #197
In a standard Bus Topology, what is the purpose of placing a 'terminator' at both extreme ends of the main shared backbone cable?
A. To absorb electrical signals and prevent signal bounce or reflection back down the line.
B. To boost the electrical signal amplification.
C. To convert the network structure into a ring format.
D. To dynamically allocate IP configurations to incoming stations.
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Correct Answer: Option A

Explanation:
Terminators absorb signals when they reach the end of a bus line, preventing signal reflection which would otherwise corrupt ongoing data transmissions.
This question belongs to: Computer Computer Networking
Question #198
Which of the following IPv4 address blocks is strictly reserved by the IETF for private local area networks and is non-routable over the public internet?
A. 12.0.0.0 /8
B. 224.0.0.0 /4
C. 192.168.0.0 /16
D. 8.8.8.0 /24
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Correct Answer: Option C

Explanation:
The 192.168.0.0 to 192.168.255.255 range is a standard private IP address block designated by RFC 1918 for internal LAN use.
This question belongs to: Computer Computer Networking
Question #199
How many bits are used to define a single unique physical MAC address etched onto a network interface card (NIC)?
A. 64 bits
B. 48 bits
C. 128 bits
D. 32 bits
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Correct Answer: Option B

Explanation:
A MAC (Media Access Control) address is a 48-bit (6-byte) permanent hardware identifier represented in hexadecimal notation.
This question belongs to: Computer Computer Networking
Question #200
Which network type connects disparate computer terminals across massive geographical footprints, such as countries or continents, with the internet being the prime example?
A. LAN
B. PAN
C. WAN
D. MAN
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Correct Answer: Option C

Explanation:
A Wide Area Network (WAN) extends over a vast national or global geographic scope, stitching together multiple smaller regional networks.
This question belongs to: Computer Computer Networking

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