CCNA Subnetting Sample Questions – Blog Post

CCNA Subnetting Sample Questions

Subnetting is an essential skill for network professionals, and it plays a crucial role in Cisco Certified Network Associate (CCNA) exams. In this blog post, we will provide you with a set of sample questions related to subnetting that will help you practice and enhance your understanding of this topic.

Question 1:

You have been assigned the network address 192.168.0.0/24, and you need to create six subnets with equal numbers of hosts. What subnet mask should you use, and what are the valid subnet addresses?

Question 2:

You have a network address of 172.16.0.0/20. How many subnets can you create, and what is the maximum number of hosts per subnet?

Question 3:

You have a network address of 10.0.0.0/8, and you want to create 512 subnets. What is the necessary subnet mask, and how many hosts are available per subnet?

Question 4:

Given the IP address 192.168.10.54/30, what is the valid range of usable IP addresses within this subnet?

Question 5:

You have a network address of 200.100.50.0/23. How many subnets can you create, and what is the broadcast address of the first subnet?

These sample questions cover various scenarios and challenges related to subnetting. Solving them will help you improve your skills and readiness for CCNA examinations. To better understand the answers and solutions, let’s analyze each question individually.

Question 1:

In a /24 network, we have a total of 256 IP addresses. If we evenly divide these addresses among six subnets, each subnet will have 256/6 = 42.67 IP addresses. Since we need equal numbers of hosts, we must consider 42 IP addresses per subnet, which requires a subnet mask of /26 (255.255.255.192). The valid subnet addresses for the given network are as follows:

192.168.0.0/26
192.168.0.64/26
192.168.0.128/26
192.168.0.192/26
192.168.1.0/26
192.168.1.64/26

Question 2:

In a /20 network, we have a total of 4096 IP addresses. The subnet mask allows for 16 subnets, calculated as 2^4 (2 raised to the power of 4). Each subnet can have 2^12 – 2 = 4094 hosts (minus 2 for the network and broadcast addresses). Therefore, you can create 16 subnets with a maximum of 4094 hosts per subnet.

Question 3:

In a /8 network, we have a total of 16777214 IP addresses. To create 512 subnets, you need the subnet mask of /23 (255.255.254.0), which provides 512 subnets. Each subnet will have 2^9 – 2 = 510 hosts available (minus 2 for network and broadcast addresses).

Question 4:

Given the IP address 192.168.10.54/30, with a subnet mask of /30 (255.255.255.252), the valid usable IP addresses within this subnet are 192.168.10.54 (network address), 192.168.10.55 (first usable IP address), and 192.168.10.56 (broadcast address).

Question 5:

In a /23 network, we have 512 IP addresses. Therefore, we can create a maximum of 512/2 = 256 subnets. The broadcast address for the first subnet will be the network address of the next subnet, which is 200.100.51.0.

Subnetting is a fundamental concept in networking, and mastering it is essential for IT professionals. The provided sample questions covered different subnetting scenarios and tested your understanding of subnet masks, networks, subnets, and available IP addresses. By practicing these questions, you will enhance your skills and be better prepared for the challenges faced in the CCNA exams.

Keep practicing, explore more subnetting examples, and don’t forget to apply your knowledge in real-life network implementations. Good luck on your CCNA journey!

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