# CST3607 Class Notes 2021-02-25

## Quiz #1: Subnetting

• (10 questions, 1/2 hour only)
• Make sure to bring in your stand-alone calculator, pencils, and an eraser.
• Make sure that you’re proficient and comfortable with the decimal to Base-256 dotted-decimal conversion method. Practice makes improvement!
• “Subnet number” x starts from 0, so do not subtract one before you multiply by the number of addresses per subnet. The result will be the number of addresses to add to the first address in the block to get to the first address in subnet #.
• For example: What’s the subnet range for subnet “number” 1023?
• i.e. The 1024th subnet is subnet number 1023.
• The “Nth/st/rd subnet” starts from 1, so you’ll have to subtract one before you multiply by the number of addresses per subnet. The result will be the number of addresses to add to the first address in the block to get to the first address in the Nth/st/rd subnet.
• For example: What’s the subnet range for the 5028th subnet?

You must be able to determine:

• The network address given an IP address.
• The number of bits for the network portion of the IP address.
• The number of bits for the host portion of the IP address.
• The number of bits to borrow
• The number of subnets
• The number of addresses per subnet
• The Wildcard Mask
• The block size (a.k.a. subnet increment), within the correct octet.
• Convert the number of addresses to add to subnet zero, to jump to the target subnet, to Base-256 dotted-decimal.

## Read / Watch / Do

### CCNA Certification Study Guide, Volume 2

• Read Chapter : 7 (Layer 2 Switching)
• Do the Written Labs
• Answer the Review Questions
• Do not submit your answers for this chapter. The answers are in Appendix.

## Do

Make sure to always have access to a calculator which has an Exponent function (^key) ( x) for every class.