Networking concepts like topology, devices, and protocols tend to blur together when you're studying them from a plain list of terms. This quiz takes a different approach — 50 computer network MCQs with answers and plain-English explanations, covering network topology (star, bus, ring, mesh, tree, hybrid), network devices (modem, router, switch, gateway, bridge), protocols and data exchange, broadband access (DSL, ISDN, VPN), and basic signal/performance concepts. It's built for CompTIA Network+ candidates, networking students in the US, UK, Canada and Australia, college coursework, and technical interview prep.
Every answer below comes with a short explanation of why it's correct, not just a letter — because the point here is to actually understand how networks are laid out and connected, not just memorize an answer key.
- ✔ Star, Bus, Ring and Mesh Topology
- ✔ Tree and Hybrid Network Layouts
- ✔ Routers, Switches, Bridges and Gateways
- ✔ Modems and Network Devices
- ✔ TCP/IP and Core Protocols
- ✔ DSL, ISDN and VPN Basics
- ✔ WAN, LAN and MAN Differences
- ✔ Bandwidth, Latency and Throughput
What Is Network Topology?
The physical or logical arrangement of a network is referred to as its topology. It describes how nodes (devices) are connected to one another and where they're positioned — and, depending on whether you're talking about physical or logical topology, it can also describe how data actually moves between those nodes.
Physical vs. Logical Topology
Network topologies generally fall into two categories. Physical topology refers to the actual physical layout — the cables, hardware, and signal paths you could literally point to. Logical topology describes how data flows through the network between devices, which doesn't always match the physical layout. For example, twisted-pair Ethernet is physically wired like a star but behaves logically like a bus topology, while token ring behaves logically like a ring even when the physical cabling is arranged differently.
The most common physical topologies are star, bus, ring, mesh, tree, and hybrid — each with its own trade-offs in cost, reliability, and ease of expansion, which is exactly what the first section of this quiz focuses on.
Diagram comparing the most common physical network topologies
Network Topology MCQs (Q1–12)
NETWORK TOPOLOGYThese questions test whether you can recognize each topology from its layout, behavior, and trade-offs.
1. Types of network topology are _____?
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Answer: B) 6. The six commonly recognized physical topologies are star, bus, ring, mesh, tree, and hybrid — each one showing up at least once later in this section.
2. Which of the following is not a network topology?
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Answer: C) Band. "Band" isn't a topology term at all — it's likely there to test whether you actually know the real list (bus, star, ring) rather than just recognizing networking-sounding words.
3. Which is the most common LAN topology for microcomputer LANs?
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Answer: D) Star topology. Most modern office and home LANs are wired as a star, with every device cabled back to a central switch — it's easier to troubleshoot and expand than the alternatives.
4. The physical layout of a LAN is known as _____?
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Answer: B) Topology. This is just the definition — topology is the term for how a network's devices and cabling are physically (or logically) arranged.
5. One or more computers connected to a hub describes which network topology?
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Answer: A) Star topology. The hub (or switch) sits at the center, with every other device cabled directly to it — that central-hub pattern is the defining feature of a star layout.
6. Which topology is typically used for a small number of computers?
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Answer: C) Bus topology. Bus networks are simple and cheap to set up, which makes sense for a handful of machines — but that single shared cable becomes a real liability as the network grows.
7. In a star topology, every device is connected to a central hub or switch. What's the main advantage of this design?
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Answer: B. Since each device has its own dedicated link to the hub, unplugging or adding one machine doesn't affect anyone else on the network — that isolation is the star topology's biggest selling point.
8. Which topology connects every device directly to every other device, offering the most redundancy but requiring the most cabling?
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Answer: C) Mesh topology. With direct links between every pair of devices, there's no single point of failure — but the amount of cabling grows fast as you add more devices, which is why full mesh setups are usually reserved for critical infrastructure.
9. In a basic ring topology, data typically travels around the network in which manner?
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Answer: A. Each device passes data to its neighbor around the loop until it reaches its destination. Some ring designs use a second loop running the opposite way for redundancy, but the basic version is a one-way circle.
10. A tree topology is best described as _____?
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Answer: B. Picture several star networks branching off a shared backbone cable — that's a tree topology, and it's exactly why it scales well for larger organizations with multiple departments or floors.
11. What is the main drawback of a bus topology?
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Answer: B. Every device shares the same backbone cable, so a single cut or fault anywhere along that cable can take the whole segment offline — a risk star and mesh topologies don't share to the same degree.
12. A hybrid topology is created by _____?
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Answer: B. A hybrid setup might combine a star topology in one office wing with a mesh layout for critical servers — mixing approaches lets network designers balance cost, reliability, and performance where each is needed most.
Network Devices & Connectors (Q13–22)
NETWORK DEVICESThis section covers the physical hardware that actually moves, directs, and protects traffic on a network — and how to tell similar-sounding devices apart.
13. A device used to connect two computers via an ordinary telephone line is _____?
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Answer: B) Modem. A modem converts digital data into a signal that can travel over a standard phone line (and back again on the receiving end), which is exactly what makes dial-up and DSL connections possible.
14. A connection between two similar networks typically uses _____?
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Answer: A) Bridge. A bridge is built to connect two segments of the same type of network. A gateway, by contrast, is the tool you'd reach for when the two networks aren't alike.
15. A device used to connect dissimilar networks is called _____?
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Answer: B) Gateway. Gateways often need to translate between different protocols or formats, since the two networks they're joining don't speak the same "language" the way two similar networks would.
16. Which of the following is not a network communications device?
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Answer: B) LAN. A LAN is the network itself, not a piece of hardware within it. Router, hub, and NIC are all physical devices that make the network function.
17. A _____ is a device that forwards packets between networks by processing the routing information included in the packet.
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Answer: C) Router. Routers read the destination address inside each packet and decide the best path to send it along — that's the core job that separates a router from simpler devices like hubs or switches.
18. Which device operates at the Data Link layer and forwards data based on MAC addresses rather than broadcasting it to every connected port?
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Answer: B) Switch. A switch actually learns which device sits on which port and sends data only where it needs to go, instead of blasting it out to every device the way a hub does.
19. A hub differs from a switch mainly because a hub _____?
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Answer: B. A hub has no awareness of which device is on which port, so it just repeats every signal to all of them — simple, but noisy and inefficient compared to a switch.
20. Which device allows a computer to physically connect to a network, and is often built directly into the motherboard?
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Answer: A) Network Interface Card (NIC). Every device on a wired or Wi-Fi network needs one of these, even if you never see it — on most modern computers it's simply integrated into the motherboard rather than a separate add-in card.
21. A repeater is primarily used to _____?
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Answer: B. Signals naturally weaken (attenuate) the farther they travel down a cable — a repeater just boosts the signal back up so the network can be extended past its normal cable-length limit.
22. Which device is specifically designed to permit or block network traffic based on a defined set of security rules?
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Answer: C) Firewall. A firewall sits between networks (or between a device and the internet) and inspects traffic against a rule set, deciding what's allowed through and what gets blocked.
Protocols, Standards & Data Exchange (Q23–30)
PROTOCOLS & DATA EXCHANGEDevices and cables only get you halfway — protocols are the agreed-upon rules that actually let two machines understand each other.
23. Two devices are considered to be in a network if _____?
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Answer: A. What actually defines "being networked" is the ability to exchange information between processes — not just that both devices happen to be running something at the same time.
24. The set of rules used to exchange data in a communications network is called a _____?
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Answer: C) Protocol. Without a shared protocol, two devices might be physically connected and still have no way to actually understand each other's data.
25. A list of protocols used by a system, with one protocol assigned per layer, is called a _____?
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Answer: B) Protocol stack. Think of it as layers stacked on top of each other, each handling one job in the communication process — that vertical arrangement is literally where the name comes from.
26. A complete set of protocols covering every layer of a network's communication is generally referred to as a _____?
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Answer: A) Protocol suite. The TCP/IP suite is the most familiar example — a whole family of related protocols designed to work together rather than a single standalone rule set.
27. Which of the following best defines a "port" in networking?
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Answer: B. A device's IP address gets traffic to the right machine; the port number then gets it to the right application running on that machine — like an apartment number on top of a street address.
28. In the client-server model, which side typically initiates a request for a resource or service?
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Answer: B) The client. The client asks, the server answers. Your browser requesting a webpage is the everyday version of this — your laptop is the client, and the website's host machine is the server.
29. Which protocol is mainly responsible for reliably delivering data between two devices, including error-checking and retransmitting lost packets?
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Answer: A) TCP. TCP keeps track of every packet sent, confirms it arrived, and asks for a resend if something got lost along the way — that reliability is the whole reason it exists alongside the faster-but-less-careful UDP.
30. A network architecture in which all devices have equal status and can act as both client and server is called a _____?
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Answer: B) Peer-to-peer (P2P) network. There's no dedicated server giving orders here — every device can both request and provide resources, which is the model behind things like file-sharing networks.
Broadband, Access & Network Types (Q31–40)
BROADBAND & NETWORK TYPESHow networks are classified by scale and how they actually reach into homes and businesses.
31. ISDN stands for _____?
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Answer: B) Integrated Services Digital Network. It was one of the first standards to carry voice and data digitally over a regular telephone line, ahead of the broadband DSL connections that mostly replaced it.
32. DSL stands for _____?
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Answer: C) Digital Subscriber Line. It's the technology that lets your phone line carry broadband internet alongside (or instead of) a regular voice call.
33. A communication channel is shared by all the machines on the network in a _____?
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Answer: B) Broadcast network. Every device on the same shared channel receives the transmission, whether it was meant for them or not — that shared-channel design is the defining trait of a broadcast network.
34. Unlike a broadcast network, in a _____ network, data is sent from one source to a single, specific destination.
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Answer: C) Unicast network. It's a one-to-one transmission — one sender, one intended receiver — rather than the one-to-many pattern you get with broadcast or multicast.
35. Which of the following networks extends a private network across public networks?
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Answer: D) Virtual Private Network (VPN). A VPN creates an encrypted tunnel over the public internet, letting a device behave as if it's directly connected to a private network even from miles away.
36. Which of the following statements is NOT applicable for cable internet access?
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Answer: A. A DSLAM belongs to DSL networks, not cable — cable internet uses a CMTS for that analog-to-digital conversion job instead. Easy to mix the two up since they play a similar role on different types of lines.
37. Which type of network typically spans the largest geographical area, often connecting cities or even countries?
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Answer: C) WAN. The internet itself is essentially the largest WAN in existence — it's the category built specifically to connect networks across long distances, beyond what a LAN or MAN would cover.
38. A leased line, often used by businesses, differs from a typical shared broadband connection mainly because it _____?
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Answer: B. With a leased line, you're not splitting bandwidth with neighbors the way you would on a typical residential connection — you get the full capacity to yourself, which is exactly why businesses pay extra for it.
39. PPP (Point-to-Point Protocol) is commonly used to _____?
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Answer: B. PPP sets up and manages a direct link between exactly two points — historically a common sight on dial-up and early DSL connections, where a stable point-to-point link was needed before data could flow.
40. Which of the following best describes ISDN compared to a standard analog telephone line?
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Answer: A. That shift to fully digital transmission is what let ISDN offer more reliable, higher-quality connections than old analog lines — even though it's since been overtaken by faster broadband options like DSL and fiber.
Basic Networking Concepts (Q41–46)
NETWORKING BASICSA handful of foundational terms and ideas that come up regardless of which specific technology you're discussing.
41. BPS stands for _____?
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Answer: D) Bits per second. It's the most basic unit for describing how fast data moves across a connection — everything from "Mbps" to "Gbps" is just this same unit scaled up.
42. People on a Local Area Network (LAN) can typically share which of the following?
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Answer: D) All of these. Resource sharing is one of the main reasons LANs exist in the first place — a single printer, modem, or drive connected to the network can serve every device on it instead of needing its own copy at each desk.
43. Software used to browse and view content on the internet is called a _____?
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Answer: A) Browser. Chrome, Firefox, Safari, Edge — all browsers, all doing the same basic job of fetching and displaying web content for you.
44. In a computer network, nodes are _____?
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Answer: D) All of these. "Node" is a broad term — it covers any device on the network capable of sending, receiving, or routing data, regardless of which specific role it's playing at a given moment.
45. 1 Megabit per second (Mbps) is approximately equal to _____?
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Answer: B) 1,000,000 bits per second. "Mega" means a million in this context, the same prefix scaling you'd see jump from kilobits to megabits to gigabits as connection speeds get faster.
46. Which of the following is an example of a node on a computer network?
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Answer: B. A node just means an active, addressable point on the network — that could be your laptop, a networked printer, or even a router itself, since it also sends and forwards data.
Signal & Network Performance (Q47–50)
SIGNAL & PERFORMANCEThe final stretch — how signal behavior and traffic conditions affect real-world network performance.
47. The number of times a wave repeats during a specific time interval is called _____?
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Answer: D) Frequency. Measured in hertz, frequency tells you how many full cycles a wave completes per second — don't confuse it with amplitude, which describes the wave's strength rather than its repetition rate.
48. Network congestion occurs _____?
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Answer: C) In case of traffic overloading. Congestion is fundamentally a capacity problem — too much data competing for too little available bandwidth, which is why it slows everyone down rather than just stopping one connection outright.
49. The time it takes for a single data packet to travel from source to destination across a network is called _____?
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Answer: B) Latency. This is the "delay" people mean when they complain about a laggy connection — it's measured in milliseconds and matters a lot more for things like video calls and online gaming than raw bandwidth does.
50. The actual rate at which data is successfully transferred across a network, accounting for real-world conditions, is called _____?
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Answer: C) Throughput. Bandwidth is the theoretical maximum capacity; throughput is what you actually get once congestion, interference, and overhead are factored in — the two numbers are rarely identical in practice.
🌐 How many did you get right? Let us know your score in the comments, and tell us which topic you'd like covered next — OSI model, IP addressing, or network security basics.
- Computer Network MCQs with Answers — Set 1
- Computer Network MCQs with Answers — Set 3
- OSI Model MCQs (All Layers Covered) — Comming Soon..
- TCP/IP Protocol MCQs — Comming Soon..
- IP Addressing and Subnetting MCQs — Comming Soon..
- Network Security MCQs — Comming Soon..
Frequently Asked Questions
What is network topology?▾
Network topology is the physical or logical arrangement of a network — how nodes are connected to one another and where they are positioned, and how data moves between them.
What is the difference between a router, a switch, and a gateway?▾
A switch connects devices within the same network using MAC addresses. A router forwards data between different networks using routing information. A gateway connects two dissimilar networks, often translating between different protocols.
What is the difference between DSL and ISDN?▾
DSL (Digital Subscriber Line) delivers broadband internet over standard copper telephone lines at high speeds. ISDN (Integrated Services Digital Network) is an older standard that transmits voice and data digitally over a telephone line, generally at much lower speeds than modern DSL.
Is this MCQ set useful for networking certifications like CompTIA Network+?▾
Yes. These questions cover core networking fundamentals — topology, devices, protocols, and broadband access — that regularly appear in CompTIA Network+, college networking courses, and technical interview screening.