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WorksheetsUnit 4 Review
Total questions: 80
Worksheet time: 40mins
Name
Class
Date
1.
Which is a common advantage of wireless (Wi‑Fi) connections?
a)
You can move around without cables
b)
They always have zero interference
c)
They can’t be intercepted
d)
They never slow down
2.
Which is a common disadvantage of wireless connections compared with cables?
a)
They are always faster
b)
They can be affected by walls and interference
c)
They use no power
d)
They can only work indoors
3.
Which technology is MOST suitable for connecting wireless headphones to a phone?
a)
Ethernet
b)
Bluetooth
c)
HDMI
d)
GPS
4.
Which technology is designed for very short range “tap” connections (e.g., pay by tapping)?
a)
NFC
b)
Wi‑Fi
c)
Ethernet
d)
Satellite
5.
Which wireless method uses light and needs a clear line-of-sight?
a)
Infrared (IR)
b)
Bluetooth
c)
Wi‑Fi
d)
4G/5G
6.
Choose TWO things that can weaken a Wi‑Fi signal.
a)
Thick walls
b)
A bigger screen
c)
Metal objects
d)
A higher battery %
7.
If Wi‑Fi is slow only in one corner of the classroom, which action is MOST likely to help?
a)
Move closer to the router
b)
Turn the monitor off
c)
Change your keyboard
d)
Delete photos
8.
Which is usually MORE reliable for a desktop computer in a lab?
a)
Ethernet cable
b)
Weak Wi‑Fi
c)
Bluetooth
d)
NFC
9.
What does 'interference' mean in networking?
a)
A device running out of storage
b)
Unwanted signals/noise disrupting wireless data
c)
A website being too popular
d)
A printer needing ink
10.
Choose TWO statements that are true about Bluetooth.
a)
Short range
b)
Usually used for peripherals
c)
Always faster than Ethernet
d)
Needs a cable
11.
Which is MOST likely to cause Wi‑Fi to drop out?
a)
Being far from the router
b)
Having a blue phone case
c)
Using a mouse pad
d)
Closing a notebook
12.
Which of these is NOT wireless?
a)
Wi‑Fi
b)
Bluetooth
c)
Ethernet
d)
4G/5G
13.
A network is best described as…
a)
A single computer
b)
A group of connected devices that can share data/resources
c)
A type of website
d)
A password manager
14.
Which is an example of a shared network resource in a school?
a)
A personal pencil
b)
A shared printer
c)
A desk
d)
A backpack
15.
Which device usually connects your home/school network to the internet and directs traffic?
a)
Router
b)
Monitor
c)
Microphone
d)
Projector
16.
Which device is mainly used to connect many wired devices inside the same local network (LAN)?
a)
Switch
b)
Speaker
c)
Camera
d)
Tablet
17.
What is an access point used for?
a)
To make documents
b)
To provide Wi‑Fi so devices can connect wirelessly
c)
To cool a laptop
d)
To print faster
18.
Which is the BEST example of a LAN?
a)
The entire Internet
b)
A school’s internal network in one building
c)
A satellite network
d)
All mobile towers worldwide
19.
Which is the BEST example of a WAN?
a)
A Bluetooth connection
b)
The Internet
c)
A USB cable
d)
A single classroom network switch
20.
Which list is in order from smallest area to largest?
a)
Internet → LAN → Bluetooth
b)
Bluetooth → LAN → Internet
c)
LAN → Bluetooth → Internet
d)
LAN → Internet → Bluetooth
21.
ISP stands for…
a)
Internet Signal Program
b)
Internet Service Provider
c)
Internal Safety Password
d)
Instant Speed Protocol
22.
A modem is mainly used to…
a)
Show websites
b)
Connect to the ISP line/service
c)
Encrypt messages
d)
Store photos
23.
An IP address is…
a)
A human-friendly website name
b)
A number label that identifies a device on a network
c)
A type of Wi‑Fi password
d)
A file type
24.
Which is a valid IPv4 address?
a)
192.168.1.25
b)
192.168.1.999
c)
192.168.1
d)
192.168.1.25.7
25.
Each part of an IPv4 address must be between…
a)
0 and 99
b)
0 and 255
c)
1 and 500
d)
0 and 999
26.
Why should two devices on the same network not share the same IP address?
a)
It makes the screen darker
b)
It causes an address conflict and data may go to the wrong device
c)
It increases battery life
d)
It makes Wi‑Fi encrypted
27.
Which device often assigns IP addresses automatically to devices joining a home Wi‑Fi network?
a)
Router
b)
Mouse
c)
Printer
d)
Headphones
28.
Which statement is TRUE?
a)
IP addresses are used by computers to send data to the right device
b)
IP addresses are only used by humans
c)
IP addresses are the same as passwords
d)
IP addresses are only for websites
29.
Which is NOT usually an IP address format?
a)
8.8.8.8
b)
10.0.0.5
c)
google.com
d)
172.16.1.1
30.
If a device is not connected to any network, which is most accurate?
a)
It can never have any address
b)
It may not have a usable network IP for the internet until it connects
c)
It must have the same IP forever
d)
It becomes a router
31.
A server is best described as…
a)
A device/service that provides data or resources to other devices
b)
A cable type
c)
A browser feature
d)
A Wi‑Fi channel
32.
In a client–server system, the client usually…
a)
Provides web pages
b)
Requests data/services
c)
Assigns IP addresses to the router
d)
Translates encryption keys
33.
Which is MOST likely to fix an IP conflict?
a)
Restart the router or renew the connection so one device gets a different IP
b)
Turn up the volume
c)
Change the wallpaper
d)
Install a font
34.
Which address is often used for private home networks (example)?
a)
192.168.0.10
b)
999.10.10.10
c)
88.88.88.88
d)
1.2.3
35.
A URL is used to…
a)
Locate a resource (page/file) on the internet
b)
Charge a phone
c)
Encrypt Wi‑Fi
d)
Create an IP address
36.
Which part of a URL tells the browser HOW to communicate?
a)
Protocol (http/https)
b)
Path
c)
Domain name
d)
File name
37.
In the URL https://kids.example.org/g6/page.html, the domain name is…
a)
https
b)
kids.example.org
c)
/g6/page.html
d)
page.html
38.
Which is an example of a domain name?
a)
bbc.co.uk
b)
203.0.113.7
c)
255.255.255.0
d)
/news/world
39.
What does the 's' in https usually mean?
a)
super
b)
secure
c)
speedy
d)
server
40.
Which statement is TRUE?
a)
A URL and an IP address are always the same thing
b)
A URL can contain a domain name and a path
c)
A URL is used only for email
d)
A URL is a Wi‑Fi password
41.
Which is MOST likely to cause a website not to load?
a)
Typing the URL incorrectly
b)
Using a blue mouse
c)
Low speaker volume
d)
A full pencil case
42.
Which is easiest for humans to remember?
a)
Domain names
b)
MAC addresses
c)
Packet headers
d)
Error-checking bits
43.
Which is NOT part of a typical URL?
a)
Protocol
b)
Domain name
c)
Path
d)
Battery percentage
44.
What does 'WWW' stand for?
a)
World Wide Web
b)
Wireless Wide Wi‑Fi
c)
Web With Windows
d)
World Web Wireless
45.
Do all websites require 'www' at the start?
a)
Yes, always
b)
No, many work without typing 'www'
c)
Only on phones
d)
Only on tablets
46.
Which URL looks safest for logging in (choose one)?
a)
http://bank-example.com/login
b)
https://bank-example.com/login
c)
bank-example.com/login (no protocol shown)
d)
ftp://bank-example.com/login
47.
DNS is used to…
a)
Translate domain names into IP addresses
b)
Make Wi‑Fi stronger
c)
Print web pages
d)
Compress files
48.
Which order is correct when you type a website name and press Enter?
a)
Browser asks DNS → gets IP → contacts server
b)
Server asks DNS → gets keyboard → shows page
c)
IP asks DNS → prints page
d)
Router asks monitor → loads page
49.
If DNS cannot find a domain name, you might see…
a)
A 'domain/server not found' message
b)
Low battery warning
c)
Printer out of paper
d)
Screen cracked
50.
A 404 error usually means…
a)
Your device has no IP address
b)
The server can’t find the page/file at that path
c)
Wi‑Fi is encrypted
d)
DNS is always broken
51.
Which situation is MOST likely to produce a 404 error?
a)
Wrong page link/path typed
b)
Router unplugged
c)
Keyboard battery low
d)
Headphones disconnected
52.
Choose TWO steps that are part of DNS working.
a)
Device asks a DNS server for an IP
b)
DNS returns an IP address
c)
Browser turns into a router
d)
Printer checks certificates
53.
If a site works by IP address but not by domain name, the most likely problem is…
a)
DNS
b)
Screen brightness
c)
Keyboard language
d)
Mouse speed
54.
Which message suggests a 'name problem' (DNS issue) rather than a 'cable problem'?
a)
DNS_PROBE_FINISHED_NXDOMAIN
b)
Battery low
c)
Caps Lock on
d)
Storage full
55.
Which is a reasonable reason for 'Internet is slow at lunchtime' in a school?
a)
More people online at the same time (congestion)
b)
Everyone uses the same pencil
c)
Screens are brighter
d)
Printers are quiet
56.
Bandwidth is best described as…
a)
How much data can be sent per second
b)
How safe a website is
c)
How long a password is
d)
How many tabs you opened
57.
Choose TWO signs a website is likely to be safer before you log in.
a)
The address starts with https
b)
There is a padlock icon
c)
The page has lots of pop-up ads
d)
The domain name is misspelled
58.
If your browser says “Your connection is not private”, the safest action is to…
a)
Enter your password quickly
b)
Leave the page and don’t enter information
c)
Ignore the warning forever
d)
Send your password to a friend
59.
An SSL/TLS certificate is mainly used to…
a)
Prove the website identity to the browser and help set up encryption
b)
Increase screen resolution
c)
Make files smaller
d)
Turn Wi‑Fi into Bluetooth
60.
Encryption means…
a)
Deleting data
b)
Turning data into secret code that needs a key to read
c)
Making the internet faster
d)
Turning a URL into a password
61.
Choose TWO true statements about encryption.
a)
You need a key/password to read encrypted data
b)
Encrypted data can still be intercepted
c)
Encryption prevents data from being sent
d)
Encryption is the same as DNS
62.
Which is MOST important to encrypt?
a)
A public news article you’re reading
b)
A password you type into a login
c)
A picture of a cloud
d)
A music volume setting
63.
Two‑factor authentication (2FA) means…
a)
Two different websites
b)
A second step to prove it’s you (like a code)
c)
Two keyboards connected
d)
Two routers in one room
64.
Phishing is…
a)
A way to connect to Wi‑Fi
b)
Trick messages that try to steal information
c)
A type of cable
d)
A browser tab
65.
Malware is…
a)
Helpful software only
b)
Software designed to harm, spy, or cause problems
c)
A secure protocol
d)
A domain name
66.
A firewall is used to…
a)
Block unwanted network traffic
b)
Print faster
c)
Increase screen brightness
d)
Translate URLs
67.
A padlock icon means the connection is encrypted, but it does NOT guarantee…
a)
The site is trustworthy
b)
The data is protected in transit
c)
A certificate was used
d)
The protocol is HTTPS
68.
Which is the best reason to avoid reusing the same password on many sites?
a)
It makes Wi‑Fi weaker
b)
If one site is hacked, attackers can access your other accounts
c)
It changes your IP address
d)
It breaks DNS
69.
Which is a good password choice?
a)
123456
b)
password
c)
MyDogRunsFast!2026
d)
aaaaaa
70.
‘Data in transit’ means data that is…
a)
Stored on a USB
b)
Moving between devices across a network
c)
Printed on paper
d)
Only inside a phone battery
71.
Choose TWO causes of errors in data transmission.
a)
Interference/noise
b)
Weak signal
c)
A larger font size
d)
A new wallpaper
72.
Packet loss means…
a)
Packets arrive faster
b)
Some packets do not arrive at the destination
c)
DNS stops working
d)
Passwords become longer
73.
Which problem can packet loss cause in a video call?
a)
Lag/freezing
b)
Better picture quality
c)
More battery
d)
Auto-correct stops
74.
Why do networks send data in packets?
a)
So only missing parts can be resent and traffic is managed
b)
So emails disappear
c)
So Wi‑Fi becomes wired
d)
So screens get brighter
75.
A protocol is best described as…
a)
A set of rules for how devices communicate
b)
A type of battery
c)
A website page
d)
A printer ink
76.
Caesar cipher: Shift letters BACK by 1 to decode. What does 'UIFTF' decode to?
a)
THERE
b)
THESE
c)
THOSE
d)
THIEF
77.
Caesar cipher: Shift letters FORWARD by 2 to encrypt. What is the encrypted form of 'NET'?
a)
PGV
b)
NDU
c)
OGU
d)
QFW
78.
Atbash cipher uses A↔Z, B↔Y, C↔X… What does 'GSVIV' decode to?
a)
THERE
b)
THEIR
c)
THREE
d)
THEME
79.
Which statement about encrypted messages is correct?
a)
Anyone can read them easily
b)
They can be read if you have the correct key
c)
They cannot be intercepted
d)
They are only used in games
80.
Which is a sensible safety step if a link looks suspicious (misspelled domain)?
a)
Click it quickly
b)
Do not click; go to the official site/app instead
c)
Share it with friends
d)
Type your password to test it
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