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 11 of 17
Question #201
What structural problem occurs in a standard Ring Topology if a single node device or its physical connection cable breaks?
A. The entire network communication loop is broken and goes down.
B. Data collision drops to zero across the layout.
C. Traffic flows twice as fast in the opposite direction.
D. The broken node converts itself into a router automatically.
Discuss
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Correct Answer: Option A

Explanation:
In a basic unidirectional ring topology, token signals pass sequentially through each machine. A single break disrupts the entire communication loop.
This question belongs to: Computer Computer Networking
Question #202
Which IPv4 address class range is explicitly reserved for multicast distribution groups rather than individual node assignments?
A. Class B
B. Class D
C. Class E
D. Class A
Discuss
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Correct Answer: Option B

Explanation:
Class D IP addresses span from 224.0.0.0 to 239.255.255.255 and are reserved worldwide for multicasting workflows.
This question belongs to: Computer Computer Networking
Question #203
What is the primary limitation of configuring a network using a point-to-point Full Mesh Topology as the number of nodes scales high?
A. It lacks absolute security constraints.
B. The network performance decreases whenever a single cable drops.
C. It cannot run modern routing software.
D. The number of required physical cables and ports grows exponentially, making it highly expensive.
Discuss
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Correct Answer: Option D

Explanation:
A full mesh layout requires n(n-1)/2 physical lines. As nodes (n) increase, the cabling overhead and hardware costs grow quadratically.
This question belongs to: Computer Computer Networking
Question #204
Which address is used by an operating system to send a packet to all host devices residing on the local subnet simultaneously?
A. MAC Identifier
B. Loopback Address
C. Broadcast Address
D. Gateway Address
Discuss
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Correct Answer: Option C

Explanation:
The broadcast address (such as 255.255.255.255 publicly or the last address of a subnet) allows data to target all nodes on that network block.
This question belongs to: Computer Computer Networking
Question #205
What does the IP loopback address '127.0.0.1' explicitly represent?
A. The local host machine itself, used to test network software stacks locally.
B. The primary public DNS server route.
C. The broadcast channel for local wireless hubs.
D. The default gateway router channel.
Discuss
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Correct Answer: Option A

Explanation:
127.0.0.1 is the standard loopback address. Packets sent here cycle back within the local network software layer without hitting external wires.
This question belongs to: Computer Computer Networking
Question #206
Which system assigns dynamic, temporary IP addresses automatically to client workstations whenever they connect to a local area network?
A. DNS
B. DHCP
C. ARP
D. NAT
Discuss
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Correct Answer: Option B

Explanation:
DHCP (Dynamic Host Configuration Protocol) automates the allocation of IP addresses, subnet masks, and gateway pointers to connecting clients.
This question belongs to: Computer Computer Networking
Question #207
What structural feature characterizes a Tree Topology layout?
A. A dense layout where every node features wireless transceivers.
B. A line of nodes with no central coordination nodes.
C. A closed loop where every machine acts as a repeater.
D. A hierarchical combination of multiple star networks connected back to a central bus backbone line.
Discuss
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Correct Answer: Option D

Explanation:
Tree topology integrates star networks into a hierarchical tree pattern, wired back to a primary root bus or centralized switch matrix.
This question belongs to: Computer Computer Networking
Question #208
Which technology translates public external IP addresses to private internal IP addresses, allowing multiple LAN gadgets to share one public web connection?
A. DHCP
B. DNS
C. ARP
D. NAT (Network Address Translation)
Discuss
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Correct Answer: Option D

Explanation:
NAT enables a router to map private, non-routable internal LAN addresses to a singular public-facing IP, conserving global IPv4 pools.
This question belongs to: Computer Computer Networking
Question #209
What new address standard was designed to replace IPv4, utilizing 128-bit addresses to eliminate global address exhaustion issues completely?
A. IPv8
B. IPX/SPX
C. IPv5
D. IPv6
Discuss
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Correct Answer: Option D

Explanation:
IPv6 addresses are 128 bits long, written as hexadecimal strings separated by colons, offering a vast array of unique addresses.
This question belongs to: Computer Computer Networking
Question #210
Which protocol is responsible for mapping a known logical IP address to its corresponding physical hardware MAC address on a local area network?
A. DNS
B. DHCP
C. ICMP
D. ARP (Address Resolution Protocol)
Discuss
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Correct Answer: Option D

Explanation:
ARP operates within local subnets to discover the physical MAC address of a device when its logical IP address is already known.
This question belongs to: Computer Computer Networking
Question #211
What is the primary purpose of a subnet mask in an IP network configuration?
A. To assign a hardware address to an internal interface.
B. To encrypt the physical payload fields.
C. To distinguish the network portion of an IP address from the host portion.
D. To route packets automatically between separate cities.
Discuss
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Correct Answer: Option C

Explanation:
The subnet mask uses binary masking to show which bits of an IP address indicate the network prefix and which bits identify the specific host device.
This question belongs to: Computer Computer Networking
Question #212
Which of the following is a key operational characteristic of a point-to-point network link?
A. It broadcasts data frames outward across all nearby devices automatically.
B. It depends entirely on Layer 3 multicast grouping schemes.
C. It shares a single common cable line among dozens of different stations.
D. It provides a dedicated data channel between exactly two distinct network nodes.
Discuss
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Correct Answer: Option D

Explanation:
A point-to-point connection links two devices directly over a dedicated path without sharing the underlying transmission media with other hosts.
This question belongs to: Computer Computer Networking
Question #213
Which device can be used to link two separate LAN segments that use different physical cabling profiles but share the same underlying protocol framework?
A. Analog Modem
B. Signal Terminator
C. Network Bridge
D. Passive Hub
Discuss
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Correct Answer: Option C

Explanation:
A network bridge filters and forwards frames based on MAC addresses, connecting separate physical segments within the same logical LAN.
This question belongs to: Computer Computer Networking
Question #214
What is the default subnet mask for a standard Class A IP address under classic classful routing rules?
A. 255.255.0.0
B. 255.0.0.0
C. 255.255.255.255
D. 255.255.255.0
Discuss
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Correct Answer: Option B

Explanation:
Class A networks allocate the first octet to the network identity, mapping to a default subnet mask of 255.0.0.0 (or /8).
This question belongs to: Computer Computer Networking
Question #215
Which type of network environment is formed when individual components like a smartwatch, Bluetooth headset, and smartphone sync together on a user?
A. MAN
B. WAN
C. PAN
D. LAN
Discuss
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Correct Answer: Option C

Explanation:
PAN (Personal Area Network) connects personal electronic devices immediately surrounding a single user.
This question belongs to: Computer Computer Networking
Question #216
In computer networking, what does the term 'Half-Duplex' communication imply?
A. Data is transmitted using double the standard frequency band.
B. Data can travel in only one direction permanently.
C. Data can travel in both directions, but only one direction at a time.
D. Data can travel in both directions simultaneously.
Discuss
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Correct Answer: Option C

Explanation:
Half-duplex systems allow bidirectional traffic, but devices must alternate sending and receiving to avoid collisions (e.g., walkie-talkies).
This question belongs to: Computer Computer Networking
Question #217
Which topological structure combines elements from two or more distinct, basic topologies (such as mixing star and bus layouts) within a single infrastructure?
A. Linear Topology
B. Hybrid Topology
C. Mesh Topology
D. Ring Topology
Discuss
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Correct Answer: Option B

Explanation:
A hybrid topology integrates multiple foundational network topologies into a combined, customized networking layout.
This question belongs to: Computer Computer Networking
Question #218
Which of the following represents a valid IPv6 address string format?
A. [http://www.google.com/ipv6](https://www.google.com/search?q=http://www.google.com/ipv6)
B. 2001:0db8:85a3:0000:0000:8a2e:0370:7334
C. 192.168.1.256
D. 00-14-22-01-23-45
Discuss
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Correct Answer: Option B

Explanation:
IPv6 addresses are written as groups of four hexadecimal digits separated by colons, encompassing eight separate structural blocks.
This question belongs to: Computer Computer Networking
Question #219
What layer of the OSI model does a traditional hardware Router operate within to make path-forwarding decisions?
A. Network Layer (Layer 3)
B. Transport Layer (Layer 4)
C. Data Link Layer (Layer 2)
D. Physical Layer (Layer 1)
Discuss
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Correct Answer: Option A

Explanation:
Routers operate at Layer 3 (Network Layer), analyzing logical IP addresses to direct data packets across networks.
This question belongs to: Computer Computer Networking
Question #220
Which device simply acts as a multiport signal repeater, copying incoming bits blindly out to all other ports without reading any address headings?
A. Router
B. Hub
C. Switch
D. Gateway
Discuss
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Correct Answer: Option B

Explanation:
A hub lacks processing logic to check frame targets. It serves as a Layer 1 broadcast device, repeating signals out across all connected nodes.
This question belongs to: Computer Computer Networking

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