APPENDIX F Practice for Chapter 15: Analyzing Existing Subnet Masks Practice Problems This appendix lists problems that require you to analyze an existing IP address and mask to determine the number of network, subnet, and host bits. From that, you should calculate the number of subnets possible when using the listed mask in the class of network shown in the problem, as well as the number of possible host addresses in each subnet. To find this information, you can use processes explained in Chapter 15 of CCENT/CCNA ICND1 640-822 Official Cert Guide. (If you are reading this as a PDF that came with CCNA