Cisco Certified Network Associate (CCNA) Practice Exam

What does VLSM stand for?

1. Variable Length Subnet Masking

2. Variable Length Subnet Model

3. Virtual Link Subnet Mask

4. Very Large Subnet Masking

The correct answer is: Variable Length Subnet Masking

The correct answer is that VLSM stands for Variable Length Subnet Masking. This technique allows for subnets of different sizes to be created from a single subnet, which can optimize the allocation of IP addresses based on the needs of different segments of a network. By using VLSM, network administrators can apply subnetting in a more efficient manner, facilitating the use of IP addresses while minimizing waste. This capability is particularly useful in situations where network demand fluctuates and varies among different subnets. The other options do not accurately represent the concept of VLSM. The term "Variable Length Subnet Model" inaccurately describes the function and terminology of subnetting. "Virtual Link Subnet Mask" and "Very Large Subnet Masking" suggest concepts that do not relate to the established practices of working with subnet masks within IP networking. Hence, focusing on the accurate terminology is crucial for understanding how subnetting, as facilitated by VLSM, can enhance network design and resource management.