Google Certification -Unit 9 Exam) *Q&A* (100% Correct) 2025/2026 |Verified|
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Google Educator
Google Certification -Unit 9 Exam)
*Q&A* (100% Correct) 2025/2026
|Verified|
1. What is the purpose of DNS in networking?
It translates domain names into IP addresses to enable communication over the internet.
2. Explain what a subnet mask is used for.
A subnet mask is used to divid...
Google Certification -Unit 9 Exam)
*Q&A* (100% Correct) 2025/2026
|Verified|
1. What is the purpose of DNS in networking?
It translates domain names into IP addresses to enable communication over the internet.
2. Explain what a subnet mask is used for.
A subnet mask is used to divide an IP address into network and host portions, helping in routing
packets efficiently.
3. What is an IPv4 address made up of?
An IPv4 address consists of four octets, each containing eight bits, written in decimal notation.
4. How does NAT (Network Address Translation) function in a network?
NAT modifies IP address information in the header of IP packets to map private internal IP
addresses to a public address for internet access.
5. What is the difference between a router and a switch?
A router connects different networks and directs traffic between them, while a switch connects
devices within a single network to enable communication.
6. What is the primary role of a DNS server in a network?
A DNS server resolves domain names to IP addresses, allowing devices to access websites and
services using human-readable addresses.
7. Describe what happens during a DHCP lease process.
The DHCP lease process assigns an IP address to a device for a specific duration, automatically
renewing or releasing it when necessary.
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, 8. What is an IP address class, and why is it important?
An IP address class determines the size of a network and the range of IP addresses that can be
used. It's essential for organizing and routing networks efficiently.
9. How does a VPN work to enhance security over a public network?
A VPN creates an encrypted tunnel over a public network, ensuring that data transmitted
between devices is secure from interception.
10. What is a MAC address, and why is it significant?
A MAC address is a unique identifier assigned to a network interface card (NIC), used for
communication within a local network.
11. What role does the ARP protocol play in networking?
ARP (Address Resolution Protocol) maps an IP address to its corresponding MAC address within
a local network.
12. How does the OSI model help in networking?
The OSI model divides networking functions into seven layers, helping standardize
communication and troubleshooting between different systems.
13. What is the primary function of a firewall in a network?
A firewall monitors and controls incoming and outgoing network traffic based on security rules,
protecting the network from unauthorized access.
14. Explain what a gateway does in a network.
A gateway acts as an entry or exit point for data between different networks, often connecting a
local network to the internet.
15. What is the difference between TCP and UDP?
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