Module 4: Networking

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In this post, I provide complete, accurate, and detailed explanations for the answers to Module 4: Networking of Course 1: Technical Support Fundamentals – Google IT Support Professional Certificate.

Whether you’re preparing for quizzes or brushing up on your knowledge, these insights will help you master the concepts effectively. Let’s dive into the correct answers and detailed explanations for each question!

Limitations of the Internet

Practice Quiz

1. What factors limit the number of available IPv4 addresses? (select all that apply)

  • The number of devices that connect to the Internet ✅
  • How many people are downloading something at the same time
  • The number of public and private websites in existence ✅
  • The number of IPv6 addresses in use

2. Which of the following protocols is the primary infrastructure that creates the Internet?

  • TCP/IP ✅
  • DNS
  • NAT
  • HTML

3. What is the limitation of the IPv4 protocol?

  • Does not have any limitations.
  • Its maximum number of IP addresses has been reached. ✅
  • It’s a slow protocol.
  • It’s obsolete.

4. What invention allows people to share more information than just text on the internet?

  • IPv4
  • TCP/IP
  • The World Wide Web ✅
  • NAT

5. How have the IPv4 limitations been solved? (select all that apply)

  • By implementing the IPv6 protocol ✅
  • By using DNS
  • By using Network Address Translation ✅
  • By creating more IPv4 address

Module 4 challenge: Networking

Graded Quiz

6. How many computers do you need to build a network?

  • 100
  • 1
  • 20
  • 2 ✅

Explanation:
A network is a connection between two or more computers that allows them to communicate and share resources. A single computer by itself is not a network.

7. You are having trouble connecting to the Internet, so you call your Service Provider for help. They need to know the permanent unique identifier address of your specific device so they can help troubleshoot it. What address are they asking for?

  • IP address
  • MAC address ✅
  • URL address
  • ISP address

Explanation:

  • MAC address (Media Access Control) is a unique, permanent identifier assigned to a network device (like your computer’s network card).
  • IP addresses can change (e.g., dynamic IPs assigned by your ISP), but MAC addresses do not change.
  • Your ISP needs your MAC address to ensure they are troubleshooting the correct device.

8. What is a networking stack?

  • A tool that connects lots of different devices together and helps route network traffic.
  • Cables containing glass fibers that move data through light.
  • A set of hardware or software that provides networking infrastructure for a computer. ✅
  • Radios and antennas that connect to wireless networks.

Explanation:
A networking stack is a combination of different layers that help a computer communicate over a network. It consists of:

  • Software components (like TCP/IP protocol)
  • Hardware components (like network cards, routers, and switches)

9. Which protocol is responsible for delivering packets to the right computers?

  • HTTP
  • IP ✅
  • FTP
  • TCP

Explanation:

  • IP (Internet Protocol) assigns unique addresses to devices and ensures packets of data reach the correct destination.
  • TCP (Transmission Control Protocol) ensures data is delivered accurately and in order, but IP handles addressing and routing.

10. What type of address do computers use to find something on a network?

  • ISP address
  • URL address
  • IP address ✅
  • MAC address

Explanation:
An IP address is a unique numerical address that identifies a device on a network.

  • Just like a house address directs mail to the correct home, an IP address directs network traffic to the right computer.

11. You want to register the domain name ABCcompany.org, but the registration service is not allowing you to do that. What's the most likely reason for this?

  • This domain name is already registered to someone else. ✅
  • Domain names must end in “.com”.
  • Domain names must be all in lowercase.
  • You are not the legal owner of ABC Company.

Explanation:

  • Domain names are unique; no two websites can have the same domain.
  • If someone else has already registered ABCcompany.org, you won’t be able to register it unless it expires.

12. What was the name of the earliest version of the Internet?

  • World Wide Web
  • ARPANET ✅
  • NAT
  • TCP/IP Network

Explanation:

  • ARPANET (Advanced Research Projects Agency Network) was the first network that led to the creation of the Internet.
  • It was developed in the 1960s by the U.S. Department of Defense.

13. Which of these can resolve IPv4 address shortages? Choose all that apply.

  • Using IPv6 addresses ✅
  • Border Gateway Protocol
  • Network Address Translation ✅
  • Autonomous Systems

Explanation:

  • IPv6 was introduced because IPv4 ran out of available addresses. IPv6 provides a massive number of new IP addresses.
  • NAT (Network Address Translation) allows multiple devices on a private network to share a single public IP address, reducing IPv4 address demand.

14. Concerning IP address shortages, what is the most important difference between IPv4 and IPv6?

  • IPv6 addresses are more secure.
  • It will be less expensive for a company to have multiple IPv6 addresses as compared to IPv4 addresses.
  • IPv6 addresses are simpler and therefore easier to remember than IPv4 addresses.
  • There are many, many more potential IPv6 addresses than IPv4 addresses. ✅

Explanation:

  • IPv4 uses 32-bit addresses (~4.3 billion unique addresses).
  • IPv6 uses 128-bit addresses, providing 3.4×10³⁸ addresses (an almost unlimited supply).

15. Which concept deals with connecting devices like smart refrigerators and smart thermostats to the internet?

  • IPv6
  • HTTP
  • NAT
  • IoT ✅

Explanation:

  • IoT (Internet of Things) refers to connecting everyday devices (smart fridges, thermostats, smartwatches, etc.) to the Internet so they can communicate and be controlled remotely.
  • IoT devices often use IPv6 because they require many unique addresses.

16. True or false: An IP address is a unique identifier for a computer on a network.

  • True ✅
  • False

Explanation:
An IP address (Internet Protocol address) is a unique identifier that allows devices to locate and communicate with each other over a network.

17. What does a router do in Networking? Choose all that apply.

  • A router sends ones and zeros through a beam of light.
  • A router can only send data to a computer on the same network.
  • A router utilizes network protocols to help determine where to send data packets. ✅
  • A router connects devices together and helps direct network traffic. ✅

Explanation:

  • Routers are devices that connect multiple networks (like your home network and the Internet).
  • They direct (or route) data packets between devices using protocols like TCP/IP.
  • A router does not send data through a beam of light—this describes fiber-optic cables.
  • Routers can send data across networks, not just within the same one.

18. What does TCP/IP stand for?

  • Transit Control Protocol and the Internet Protocol
  • Transmission Control Protocol and the Internet Protocol ✅
  • Transmission Control Protocol and the Interconnection Protocol
  • Transmit Control Protocol and the Intelligence Protocol

Explanation:

  • TCP/IP is the foundation of the Internet.
    • Transmission Control Protocol (TCP) ensures data is sent accurately.
    • Internet Protocol (IP) routes packets to the correct destination.

19. What is www.google.com an example of?

  • HTTP
  • ISP
  • URL ✅
  • ICANN

Explanation:
A URL (Uniform Resource Locator) is the web address you type in a browser to access a website.
For example, www.google.com points to Google’s homepage.

20. Which group manages the registration of domain names?

  • Web Registrar
  • ICANN ✅
  • DNS
  • ISP

Explanation:
ICANN (Internet Corporation for Assigned Names and Numbers) is responsible for managing:

  • Domain name registration (e.g., google.com)
  • IP address allocation
  • Top-level domains (TLDs) like .com, .org, .net

21. At first, what was the only kind of information that could be sent over the early internet?

  • Text ✅
  • Email
  • Media
  • Audio

Explanation:
When the ARPANET (the early Internet) was first created in the 1960s, it could only send simple text messages. Multimedia like images, video, and audio came later.

22. Which tool lets organizations use many private addresses within one public IP address?

  • IP
  • HTML
  • ICMP
  • NAT ✅

Explanation:
NAT allows multiple devices on a private network (e.g., your home Wi-Fi) to share a single public IP address when accessing the Internet.
This helps conserve IPv4 addresses.

23. Which problem does IPv6 (Internet Protocol version 6) help to solve?

  • Companies waste hundreds of public IP addresses. With IPv6, they can use just one IP address.
  • Internet Protocol versions prior to version 6 haven’t achieved widespread use.
  • There are less than 4.3 billion IPv4 addresses, which has already been exceeded with existing websites. ✅
  • IPv5 is an outdated protocol version with insufficient security safeguards.

Explanation:

  • IPv4 has 32-bit addresses (~4.3 billion possible addresses), which are nearly exhausted.
  • IPv6 uses 128-bit addresses, providing trillions of unique addresses to support future devices.

24. You're browsing the Web, and type in www.google.com in the address line. Instead of the website, an error screen appears. You type in 216.58.214.4, and the Google website comes up. What's the most likely reason for this?

  • Web addresses must be entered in lowercase.
  • Address line is for the IP address only, not the domain name.
  • There’s a problem with your Internet connection.
  • There’s a problem in your network’s DNS configuration. ✅

Explanation:

  • DNS (Domain Name System) translates domain names (e.g., google.com) into IP addresses (e.g., 216.58.214.4).
  • If the DNS is misconfigured, domain names won’t resolve, but direct IP entry might still work.

25. What was the biggest problem with the earliest version of the Internet in the late 1960s?

  • Computers were too big and bulky for accessing the Internet.
  • Networks couldn’t talk to each other. ✅
  • There was no way to remotely access any computer.
  • The TCP/IP protocol could only be used in universities, governments, and businesses.

Explanation:

  • Early networks were isolated and couldn’t communicate with each other.
  • ARPANET (precursor to the Internet) was developed to connect different networks.

26. How many bits are in an IPv6 address?

  • 64
  • 32
  • 128 ✅
  • 256

Explanation:

  • IPv4 addresses are 32-bit (e.g., 192.168.1.1).
  • IPv6 addresses are 128-bit, allowing for a vastly larger number of addresses.

27. IT networking involves which of these? Choose all that apply.

  • Joining professional networks
  • Building networks ✅
  • Managing networks ✅
  • Designing networks ✅

28. Which of these addresses identify a computer on the network?

  • AC address and IP address
  • WWW and IP addresses
  • MAC address and IP address ✅
  • ISPs and IP addresses

Explanation:

  • A MAC address (Media Access Control) is a unique identifier for a device’s network interface.
  • An IP address (Internet Protocol address) identifies a device on a network.

29. What are some examples of IoT (Internet of Things)? Choose all that apply.

  • An online car dealership that can provide complete car history using the vehicle identification number
  • Thermostats that turn off the air conditioning when you leave the room ✅
  • Teachers who post assignments for their students on the school website
  • Refrigerators that keep track of the food and notify you when to buy more ✅

Explanation:

  • IoT (Internet of Things) refers to smart devices that connect to the Internet for automation.
  • A car dealership providing history or teachers posting assignments online are not IoT examples.

Related contents:

Module 1: Introduction to IT
Module 2: Hardware
Module 3: Operating System
Module 5: Software
Module 6: Troubleshooting

You might also like:

Course 2: The Bits and Bytes of Computer Networking
Course 3: Operating Systems and You: Becoming a Power User
Course 4: System Administration and IT Infrastructure Services
Course 5: IT Security: Defense against the digital dark arts

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