Why is VSLM not used in CCNA 1?

VSLM (Variable Length Subnet Masking) is not covered in CCNA 1 primarily because the course focuses on foundational networking concepts, including basic IP addressing and subnetting. VSLM is a more advanced topic that involves optimizing subnetting for more efficient IP address use, which is typically introduced in later courses when students have a stronger grasp of networking principles. The emphasis in CCNA 1 is on understanding the basics before delving into more complex addressing techniques.