Networking topics

Networking brings together a range of technologies that let computers communicate locally and across the world. At the local scale, a LAN links devices within a home or office; at larger scales, WAN links span great distances and connect into the global internet. Whatever the scale, communication relies on the TCP/IP protocol suite, which defines how data is addressed, broken into packets, routed between networks, and reassembled reliably at the destination.

One feature that shaped modern home and office networks is network address translation (NAT). Because public internet addresses are a limited resource, NAT lets many devices on a private network share a single public address: a router rewrites the address information in outgoing packets and tracks the connections so replies return to the correct internal device. This both conserves addresses and hides internal hosts from the outside.

Wireless networking removes the need for cabling by carrying data over radio waves, allowing laptops, phones, and other devices to join a LAN through an access point. Connectivity to the wider internet typically arrives over broadband links such as ADSL or other DSL variants, cable, or fibre, replacing the slower dial-up and ISDN connections of earlier years. Interfaces such as USB and standards bodies like the ITU and IEEE underpin much of this equipment, and integrity mechanisms such as the cyclic redundancy check help ensure that frames arrive without corruption.

Frequently asked questions

What does NAT do?

Network address translation lets multiple devices on a private network share one public internet address by rewriting address information in passing packets and tracking each connection so replies reach the right device.

How does wireless networking carry data?

It transmits data as radio signals between devices and an access point, removing the need for cables while still joining the devices to the same local network and the internet.

What is the role of TCP/IP?

TCP/IP is the protocol suite that addresses, routes, and reliably delivers data across networks, and it is the common language that allows different networks to interconnect as the internet.