Exam tip 1
When asked to compare Client-Server and P2P, always discuss specific aspects like security, cost, setup, scalability, and what happens if a device fails. Use examples to support your points.
9618 · 2.1
Networks including the internet — common mistakes
Common exam mistakes on 9618 Networks including the internet. Learn what loses marks, then practise the topic with Examiner’s Ink.
Exam tip 2
Examiners love to test the difference between bits and Bytes. Always check the units carefully in any calculation question involving file size and network speed. Remember 'B' (capital) is for Bytes, 'b' (lowercase) is for bits. There are 8 bits in 1 Byte.
Is Wi-Fi a network type like LAN or WAN?
Not exactly. Wi-Fi is a technology, a set of protocols for wireless communication. You use Wi-Fi to create a WLAN (Wireless Local Area Network). So, Wi-Fi is the method, while WLAN is the resulting network type, which is a form of LAN.
If P2P is so resilient, why isn't the whole internet P2P?
While P2P has advantages for specific tasks like file sharing, the client-server model is essential for services that require authority, consistency, and trust. For example, you need a central, authoritative server for your bank account details or for a search engine like Google to index the web. A P2P model would be chaotic and insecure for these applications.
What is the difference between a router and a switch?
A switch operates at the LAN level to connect devices within the same network (e.g., connecting your PC, printer, and games console at home). A router is a 'smarter' device that connects different networks together and routes traffic between them (e.g., connecting your home LAN to the internet WAN). Your home 'router' is often a combination device that includes a router, a switch, and a wireless access point.