Library›ICT 4IT1›Benefits of using a Local Area Network (LAN)
O Level · ICT 4IT1
Benefits of using a Local Area Network (LAN)
Revise Benefits of using a Local Area Network (LAN) for ICT 4IT1 (O Level) — revision notes and instant AI marking.
📖 Revision notes
Edexcel IGCSE ICT · Networks
Local Area Networks (LAN)
Big idea: a LAN lets computers in one building share stuff — printers, files, internet, security — and whether a "boss" server manages it (client-server) or everyone manages themselves (peer-to-peer) is the single biggest decision that shapes everything else about the network.
Summary — The Whole Chapter in One Look
LAN = a network confined to one site (one building or a small group of nearby buildings), connecting devices so they can share resources.
Benefits of a LAN: shared peripherals, shared internet, files accessible from any networked computer, easier communication, shared files/folders, centralised backups/updates/security, media streaming.
Drawbacks of a LAN: higher security risk, malware can spread across the whole network, a central point of failure (server/switch dies → everyone's stuck), performance drops as more users/data pile on.
Peer-to-peer network: no server — every computer ("peer") is equal and manages its own files, backups, security and printer access. Typical of home networks.
Client-server network: a dedicated server does specific jobs (internet access, printing, email, backups, security) for many "client" computers, which connect via a switch. Typical of schools and businesses.
Each model has a clear advantages/disadvantages trade-off — cost and simplicity vs. control and security.
1. Benefits & Drawbacks of a LAN
What actually is a LAN?
Picture your school. Every classroom has computers, the office has computers, the library has computers — and they're all wired (or wirelessly connected) together within that one site. That whole set-up is a Local Area Network. The key word is local: everything is close together, usually in one building or a small cluster of buildings owned by the same organisation. This is different from a Wide Area Network (WAN), which spans cities, countries, or the entire planet (the internet itself is the biggest WAN of all) — but that's a topic for another day.
Once computers are connected like this, something powerful happens: instead of every single computer needing its own printer, its own internet connection, and its own copy of every file, they can all share those things. That sharing is really the entire point of a LAN, and it's exactly what the exam wants you to be able to explain.
Core Idea to Remember
A LAN's value comes from sharing — hardware (peripherals), software, files, internet access, and management (backups/security) — instead of duplicating everything on every machine.
Benefits of a LAN — explained, not just listed
The specification lists seven benefits. Don't just memorise the words — understand why each one saves time, money, or hassle. Here they are, expanded:
1. Sharing peripherals (e.g. printers). Without a network, every computer needs its own printer — expensive, and most of those printers sit idle most of the day. On a LAN, one good printer can serve an entire office or classroom. Cheaper to buy, cheaper to maintain, and better used.
2. Shared access to the internet. One internet connection (one router/modem) can be shared across every device on the LAN, rather than every computer needing its own separate subscription and hardware.
3. Access files from any computer on the network. If your files live on a shared/networked drive rather than only on your own hard disk, you can log in at any computer on the network and get to your work. This is called hot-desking — useful in an office where people don't have a fixed desk, or in a school where you might use a different computer room each lesson.
4. Easier communication. Being on the same network makes email and internal messaging/social tools simple to set up and use between everyone in the organisation.
5. Sharing files and folders. Central databases and spreadsheets can be worked on collaboratively — everyone sees the same up-to-date version instead of emailing files back and forth and ending up with five conflicting copies.
6. Centralised backups, updates and security (via a server). Instead of trusting 200 individual students or staff to remember to back up their own work and install their own updates, a server can do this automatically for everyone, from one place.
7. Media streaming. Movies, music, and games can be streamed across the network rather than every device needing its own local copy of the file.
Memory Hook
Think of the acronym feel of: Peripherals, Internet, Files, Communication, Files/Folders, Backups/Security, Media. Or simpler — ask yourself "what would I have to duplicate on every single computer if there were NO network?" Whatever you'd have to duplicate is exactly what a LAN lets you share instead.
Drawbacks of a LAN
Sharing is powerful, but it's a double-edged sword — the very same connections that let you share files also let problems spread. Here's what can go wrong:
Increased security risk. With computers isolated and unconnected, a hacker would need to physically access each one. On a LAN, a single weak point can potentially expose data across the whole network.
Malicious software spreads. A virus that infects one machine can travel across the network connections and infect others, potentially rendering the whole network unusable rather than just one computer.
Central point of failure. This is a big one for exams. If a critical server or switch breaks down, everyone who depends on it loses access — printing, file access, internet, whatever that device managed — even though their own computer is working perfectly fine. Centralising things is efficient, but it means one failure has a much bigger blast radius.
Performance can degrade. Networks have finite capacity. As more users log on and more data moves across the network at once, things can slow down — think of it like more cars causing traffic on a road that doesn't get any wider.
Q1. Zarmeen connects her laptop to a local area network. Describe two benefits of doing this. [4 marks]
Q2. A school's file server suddenly fails. Explain why this could disrupt the entire network, even though every individual computer is still switched on and working. [3 marks]
2. Peer-to-Peer Networks
What is a peer?
A peer is simply a computer on the network that is equal to every other computer — no computer is "in charge" of the others. Think about your own home Wi-Fi: your laptop, your sibling's phone, and the smart TV are all just connected to the same router, but none of them controls the others. That's the essence of a peer-to-peer network — and it's exactly what most home networks are.
Because there's no server providing central services, each individual peer has to take on that responsibility for itself:
Often has its own printer attached directly to it (rather than sharing one centrally-managed printer)
Provides access to its own files — there's no central shared drive everyone can access
Is responsible for its own backups — no one is doing this for you automatically
Is responsible for its own security — antivirus, firewall, updates, all down to that individual machine
Definition to memorise word-for-word
A network with no server providing services is a peer-to-peer network. Every computer manages itself.
Advantages
Disadvantages
Very easy to set up and maintain
Very cheap — no expensive server hardware needed
No specialist IT knowledge or dedicated staff required
Users must manage their own backups
Users must manage their own software updates
The network overall can be less secure
Real-World Anchor
Whenever a peer-to-peer question stumps you, picture your own home network: your family's laptops and phones are each responsible for their own files, their own antivirus, their own backups. Nobody is "the boss" — that's peer-to-peer, in a nutshell.
Q3. Describe two drawbacks of using a peer-to-peer network. [4 marks]
3. Client-Server Networks
What is a client-server network?
Now flip the model. In a client-server network, there's a hierarchy: a client is just a normal computer on the network, and it connects to a dedicated server via a switch (a device that directs network traffic between connected devices). The server is a separate, often specially-built machine whose entire job is to provide services to all the clients.
A server usually specialises — it often has a single main purpose, such as:
Managing access to the internet — one gateway/connection for the whole network
Managing printing — controls print jobs from every client centrally
Providing email services
Providing backups — for every client, automatically, from one place
Controlling security — logins, permissions, antivirus policy, etc.
Because it's doing heavy-duty, centralised work for potentially hundreds of clients at once, a server is usually more powerful than any individual client machine, and it's treated as more significant — often needing specialist hardware and specialist software (and a specialist person — a network manager — to look after it).
[Laptop] [Laptop] [Desktop PC]
\ / |
(wireless) |
\ / |
[WIRELESS ACCESS POINT] ---- [ SWITCH ] ----
| \
| [Desktop PC]
[SERVER 🔒]
All clients connect through the SWITCH.
The SERVER (often locked down/secured) provides
the shared services: backups, security, printing, internet.
Definition to memorise word-for-word
A network which uses a server is called a client-server model. Most companies, organisations and schools use this model.
Advantages
Disadvantages
Backups are managed easily from one central point
Updating/installing new software can be done centrally, instead of logging on to every machine individually
Security of files can be managed easily and consistently
Servers can be expensive to purchase, set up and maintain
A specialist network manager is required — specialist IT knowledge needed
The server is a single point of failure — if it fails, all users lose access to the network
Watch Out — This Is a Classic Trap!
Students often think "client-server = more secure, no downsides." But notice the disadvantage table: centralising everything into one server also means that one failure can take down access for everyone. Examiners love testing whether you understand this trade-off, not just "client-server is better."
Peer-to-peer vs. client-server — the core trade-off
If you remember nothing else, remember this trade-off: peer-to-peer is cheap and simple but leaves everything to individual users; client-server costs more and needs expertise but gives centralised control. It's basically the classic "DIY vs. hire a professional" trade-off, applied to networking.
Q4. A small business with only 3 employees is deciding between a peer-to-peer and a client-server network. Suggest, with reasons, which model would suit them better. [4 marks]
What to Memorise
LAN
A network confined to one site/building, allowing devices to share resources like peripherals, files, and internet access.
Peer
A computer on a network that is equal to every other computer — no server, no hierarchy.
Server
A computer on a network that provides a specific centralised service (internet, printing, email, backups, security) to client computers.
Client
A computer on the network that connects to the server via a switch to use its services.
Switch
A networking device that connects clients (and the server) together and directs data traffic between them.
Single/Central point of failure
A component (like a server) that, if it fails, disrupts access for the whole network — a key drawback of centralising services.
Peer-to-peer network
A network with no server providing services — cheap, easy to set up, but each user manages their own backups/security.
Client-server network
A network that uses a server for centralised management — more secure and easier to administer, but costly and needs specialist staff.
Concepts Checklist
Exam Tips & Common Mistakes
Always explain, don't just name
"Shared peripherals" alone usually only earns 1 mark. The second mark almost always comes from explaining the consequence — e.g. "...which reduces the cost of buying a printer for every computer." Get in the habit of writing point → because → so what.
Don't mix up peer-to-peer and client-server responsibilities
A very common mistake is saying a peer-to-peer network "has a server that does backups" — it doesn't! By definition, peer-to-peer has NO server. If a server is present, it's automatically a client-server network.
"More secure" needs justification
Don't just say client-server is "more secure" — explain that security can be centrally managed and controlled from one point, rather than left to individual, possibly careless, users.
Remember the flip side of every advantage
Centralisation (client-server) is powerful, but always has a matching risk: one server failing = everyone loses access. Examiners often ask you to identify this trade-off directly, so have it ready both ways.
Use the home-network anchor
When a question feels abstract, ground it: "peer-to-peer" = think home Wi-Fi; "client-server" = think school network with a server room and IT technician. This instantly helps you generate real, specific answers instead of vague ones.
What's inside
📖 Revision notes🎯 Learn mode✦ AI flashcards✓ Instant AI marking🧊 3D explorers🧪 Experiments & simulations📈 Progress tracking
Practise Benefits of using a Local Area Network (LAN) free
You have just read the whole note. Create a free account for the flashcards and practice questions on this topic, marked instantly against the official answer. No credit card.