The Network

🏠 Your local network (LAN)

At home or school your devices connect to a router — by Wi-Fi or cable — forming a Local Area Network (LAN). The router is the gateway between your LAN and the wider internet.

📮 Packets

Data is split into small packets, each labelled with where it's going and where it came from, like addressed envelopes. They travel separately and are reassembled at the destination.

🌍 ISP and the wider internet

Your router passes packets to your ISP (e.g. Safaricom, Zuku, JTL). The ISP connects to other networks — through cables, fibre, and undersea cables — until your packets reach the right server, maybe on another continent.

🔢 IP addresses

Every device on a network has an IP address, a number that identifies it, like a postal address. Packets use IP addresses to find their way. Public IPs are reachable on the internet; private IPs (like 192.168.x.x) are used inside your LAN.

⏱️ Why distance matters

A server far away means packets travel further, so ping is higher. Content delivery networks (CDNs) keep copies of popular content closer to users to make it faster — one reason some sites load quicker than others.

Key points

• At home your devices connect to a router, forming a local network, a LAN.
• The router is the gateway between your LAN and the wider internet.
• Data travels as packets, like addressed envelopes.
• Your router passes packets to your ISP, like Safaricom or Zuku.
• The ISP connects to other networks, even by undersea cables.
• Every device has an IP address, like a postal address, so packets find their way.
• A far server means higher ping; CDNs keep copies closer to speed things up.

Try it for real: Trace your network

• Find your device's IP address (phone: Settings > Wi-Fi > the network; PC: 'ipconfig' or 'ifconfig'). Is it a private 192.168.x.x?
• With a grown-up, find who your ISP is.
• Run 'tracert google.com' (Windows) or 'traceroute google.com' and count the hops.