Given Network 172.18.109.0 Which Subnet Mask Would Be Used If 6 Host Bits Were Available?

CCNA 200-301 exam dumps free means free practice questions or study materials for the CCNA 200-301 exam. These dumps help you get an idea of the real exam by showing sample questions. They are useful for review, but it’s also a good idea to study from official books and do hands-on practice to fully prepare for the test.

Tech Professionals

09 April 2025

Cisco

Given Network 172.18.109.0 Which Subnet Mask Would Be Used If 6 Host Bits Were Available?

Introduction To CCNA 200-301 Exam Dumps Free

Navigating the world of networking can feel like deciphering an intricate puzzle. For those aspiring to become certified network associates, the CCNA 200-301 exam stands as a significant milestone. One question that often arises, testing a candidate's understanding of subnetting, is: "Given network 172.18.109.0, which subnet mask would be used if 6 host bits were available?" This seemingly simple question requires a solid grasp of binary arithmetic and subnetting principles.

In this blog post, we'll dissect this problem, explaining the underlying concepts and providing a clear solution. We'll also explore how resources like Study4Pass can be invaluable in your CCNA 200-301 Preparation, especially when seeking reliable “CCNA 200-301 exam dumps free” to supplement your learning.

Understanding the Problem

The question presents us with a Class B network address, 172.18.109.0. It asks us to determine the subnet mask needed when we have 6 host bits available.

Key Concepts

1. Network Address: 172.18.109.0. This is a Class B network, meaning the first two octets (172.18) are the network portion by default.

2. Host Bits: These are the bits within the IP address that are used to identify individual hosts within a subnet. 6 host bits are given.

3. Subnet Mask: This is a 32-bit number that separates the network portion of an IP address from the host portion. It determines how many bits are used for the network and how many for hosts.

4. Subnetting: The process of dividing a network into smaller subnetworks to improve efficiency and security.

Solving the Problem Step-by-Step

1. Calculate the Number of Hosts:

With 6 host bits, the number of usable hosts is calculated as $2^6 - 2 = 64 - 2 = 62$. We subtract 2 because one address is reserved for the network address and one for the broadcast address.

2. Determine the Number of Network Bits:

Since an IPv4 address has 32 bits and we have 6 host bits, the number of network bits is $32 - 6 = 26$.

3. Construct the Subnet Mask:

We need to represent 26 network bits in binary. This means the first 26 bits are 1s, and the remaining 6 bits are 0s.

Binary representation: 11111111.11111111.11111111.11000000

Convert each octet to decimal:

11111111 = 255
11111111 = 255
11111111 = 255
11000000 = 192

Therefore, the subnet mask is 255.255.255.192.

4. Verification

The subnet mask 255.255.255.192 indicates that the first 26 bits are used for the network, and the last 6 bits are used for hosts, fulfilling the requirement.

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