Internet and Networking Basics for Computer Operator Tests
The internet and networking concepts tested in clerk and computer operator exams, from IP addresses, DNS and protocols to LAN, WAN, routers and email terms.
By the World MCQ Forum Editorial Team · 27 October 2026 · 2 min read
Networking questions use a lot of abbreviations, which makes them look harder than they are. Behind the jargon there are only a few ideas. This guide explains them in the order they build on each other.
1. Every device needs an address: IP
Devices on a network find each other using IP addresses.
- IPv4 addresses are 32 bits long, written as four numbers such as
192.168.1.1. - IPv6 addresses are 128 bits long, created because the world was running out of IPv4 addresses.
Each network card also has a fixed hardware address called a MAC address (48 bits).
2. Names are easier than numbers: DNS
People remember a name like example.com, not a number like 203.0.113.10. The Domain Name System (DNS) translates names into IP addresses, like a phone book for the internet.
3. Rules for talking: protocols
A protocol is an agreed set of rules for a particular job:
| Protocol | Job |
|---|---|
| HTTP / HTTPS | Loading web pages (HTTPS is encrypted) |
| SMTP | Sending email |
| POP3 / IMAP | Receiving email from a server |
| FTP | Transferring files |
| TCP | Making sure data arrives complete and in order |
| IP | Addressing and routing data |
Default ports sometimes appear in harder questions: HTTP uses 80, HTTPS 443, FTP 21 and SMTP 25.
4. Sizes of networks
- PAN (Personal Area Network): a few metres, such as a phone and Bluetooth earbuds
- LAN (Local Area Network): a building, such as an office or school
- MAN (Metropolitan Area Network): a city
- WAN (Wide Area Network): countries or continents. The Internet is the largest WAN.
5. The devices that connect it all
- Switch: connects devices within a LAN
- Router: connects different networks and forwards data between them, such as your home network and the internet
- Modem (modulator-demodulator): converts digital data into signals that can travel over phone, cable or fibre lines
- Firewall: allows or blocks traffic based on security rules
6. Network shapes: topologies
- Star: every device connects to a central switch or hub. One broken cable affects only one device. This is the most common in offices.
- Bus: all devices share a single cable.
- Ring: devices form a closed loop.
- Mesh: devices have multiple connections to each other, so there are backup paths.
7. The OSI model in one line
The OSI reference model describes networking in seven layers: Physical, Data Link, Network, Transport, Session, Presentation and Application. Routing happens at the Network layer (layer 3).
8. Email terms
- CC (carbon copy): other recipients can see this address.
- BCC (blind carbon copy): hidden from other recipients.
- Phishing: fake messages that try to steal passwords or bank details.
- Spam: unwanted bulk email.
9. Wi-Fi and Ethernet
Wi-Fi is based on the IEEE 802.11 family of standards; wired Ethernet is IEEE 802.3.
Test yourself
Work through our Internet and Networking MCQs, then the Computer Abbreviations set. If an abbreviation still feels unfamiliar, come back to the section above that explains it.