Loading...
A LAN covers a relatively limited site, while a WAN connects across larger areas. A client–server system centralises services and management; peer-to-peer systems share roles between peers. A switch connects devices within a network, a router moves packets between networks and a wireless access point connects wireless devices. The Internet is an interconnected network, while the Web is one service operating over it.
Video by Craig'n'Dave. The video’s own board label is retained; follow the specification reference and scope notes on this lesson for assessed content.
Viewing focus: Compare LAN, WAN, client–server and peer-to-peer models
After watching, attempt these questions before opening the answers. You can also use the written lesson below.
After watching 1: Which device routes between networks?
Router. Routing chooses where packets go between networks.
After watching 2: Is the Web identical to the Internet?
No. The Web is one Internet service.
What you'll be able to do
A LAN covers a relatively limited site, while a WAN connects across larger areas. A client–server system centralises services and management; peer-to-peer systems share roles between peers. A switch connects devices within a network, a router moves packets between networks and a wireless access point connects wireless devices. The Internet is an interconnected network, while the Web is one service operating over it.
Packets carry data and control information such as addressing and sequence information. An IP address supports routing between networks, while a MAC address identifies a network interface within link-level delivery. DNS resolves a domain name into an address used to reach a service. A packet route can vary, and receiving software can reassemble or request data as required by the protocol. Bandwidth is capacity; actual performance also depends on congestion, latency and other constraints.
Protocols define how devices communicate. HTTP supports web requests, HTTPS protects them using encryption, TCP provides reliable ordered transport and IP supports addressing and routing. Email and file transfer use other specified protocols. Layers separate responsibilities, making implementation and troubleshooting more manageable. Do not claim encryption alone makes a website honest: it protects communication with the endpoint, while authenticity, safe behaviour and account protection remain distinct concerns.
Attempt these problems on paper before opening the worked reasoning. Explain your steps as well as giving a final answer.
Common mistakes to avoid
Key takeaways
Question 1: Why might a school choose client–server networking?
Central management suits many users, with cost and dependency trade-offs.
Check the assessed scope and practical or mathematical requirements.
An external explanation or interactive activity to use alongside the lesson. It may include extension material.
Close the notes and answer from memory. Revisit any explanation you cannot yet reconstruct.
Test yourself
Answer a few questions, then review anything you missed.
Start with the quiz above to check the key ideas. You can also choose another topic from the practice library.