1
The main function of DNS is to:
Correct answer: C. Convert domain names into IP addresses
The Domain Name System works like the internet's phone book, translating names such as example.com into the IP addresses computers use.
Read detailseasy
Internet and Networking MCQs
Solved Internet and Networking MCQs: IP addresses, DNS, protocols, network types and topologies, email and common abbreviations, with explanations.
25 MCQsUpdated 27 October 2026
This set explains how computers talk to each other: DNS, IP and MAC addresses, email and web protocols, HTTPS security, modems, Bluetooth and Wi-Fi standards, and the main types of network.
Networking questions often hinge on one word in a full form or one function of a protocol. Read the explanations to learn what each protocol does, not just its name, and the options become much easier to separate.
- 2
An IPv4 address is how many bits long?
Correct answer: B. 32 bits
IPv4 addresses are 32 bits, written as four numbers such as 192.168.1.1. IPv6 addresses are 128 bits.
medium - 3
An IPv6 address is how many bits long?
Correct answer: C. 128 bits
IPv6 uses 128-bit addresses to provide a vastly larger address space than IPv4.
medium - 4
A MAC address is how many bits long?
Correct answer: B. 48 bits
A MAC address is a 48-bit hardware identifier, usually written as six pairs of hexadecimal digits.
hard - 5
URL stands for:
Correct answer: A. Uniform Resource Locator
A URL is the address of a resource on the web, such as https://www.example.com/page.
easy - 6
HTML stands for:
Correct answer: C. HyperText Markup Language
HTML is the markup language used to structure web pages.
easy - 7
Which protocol is used to send email?
Correct answer: D. SMTP
SMTP (Simple Mail Transfer Protocol) sends mail. POP3 and IMAP are used to retrieve it from a mail server.
easy - 8
Which protocol is mainly used to transfer files between computers over a network?
Correct answer: B. FTP
FTP (File Transfer Protocol) uploads and downloads files between a client and a server.
easy - 9
The default port number for HTTPS is:
Correct answer: D. 443
HTTPS uses port 443, plain HTTP uses port 80, FTP uses 21 and SMTP uses 25.
hard - 10
The "S" in HTTPS stands for:
Correct answer: C. Secure
HTTPS is HTTP secured with TLS encryption, which protects data between the browser and the website.
easy - 11
A network that covers a small area such as an office or a school is called a:
Correct answer: B. LAN
A Local Area Network connects devices within a limited area like a building. A WAN spans cities or countries.
easy - 12
The Internet is the largest example of a:
Correct answer: C. WAN
The Internet is a global Wide Area Network made up of millions of interconnected networks.
easy - 13
A Bluetooth connection between a phone and wireless earbuds is an example of a:
Correct answer: B. PAN
A Personal Area Network connects devices close to one person, typically within a few metres.
medium - 14
In which network topology are all devices connected to a central hub or switch?
Correct answer: B. Star
In a star topology each device has its own cable to a central hub or switch, so one broken cable affects only one device.
Read detailseasy - 15
Which device connects different networks and forwards data packets between them?
Correct answer: B. Router
A router directs packets between networks, for example between a home LAN and the Internet.
easy - 16
The word "modem" is short for:
Correct answer: D. Modulator-demodulator
A modem converts digital data into signals that can travel over telephone, cable or fibre lines, and back again.
easy - 17
How many layers does the OSI reference model have?
Correct answer: C. 7
The OSI model has seven layers: Physical, Data Link, Network, Transport, Session, Presentation and Application.
medium - 18
In the OSI model, routing of packets between networks happens at which layer?
Correct answer: C. Network layer
The Network layer (layer 3) handles logical addressing such as IP addresses and routing.
hard - 19
Which IEEE standard family defines Wi-Fi?
Correct answer: C. 802.11
Wi-Fi is based on IEEE 802.11. Wired Ethernet is IEEE 802.3, and 802.15 covers personal area networks such as Bluetooth.
Read detailshard - 20
In email, the BCC field is used to:
Correct answer: A. Send a copy with the recipient hidden from others
BCC (blind carbon copy) recipients receive the email, but other recipients cannot see their addresses.
easy