Subnetting

No matter what entry level certification you are tryin to get ( CompTIA Network +, MCP, CCNA,) they all require subnetting the quick you can do i the better. Most time in a production environment you will probably only work with subnets /21-/24, this means max 2046 254 hosts receptively. This not only important to pass a test put also a very practical skill. And if are taking the cisco exam the it its even more important to strengthen your subnetting skills.