2 14 Appendix A n Answer s to Review Ques tions Chapter 1: Domain 1 Net work Technologies 1. C . A Media Access Control (M AC) address is a unique physical address that is assigned to each net work interface card. M AC addresses are "burned in" to the card at the manufacturer. 2. C . A n I P v4 address is a 32-bit address. It is composed of four sections of 8 bits each, called octets. Each octet is converted to decimal for configuration purposes, but the computer uses the entire 32-bit address for communication. 3. B . I f you have a Class B address with a default subnet mask, then the current subnet mask is 255. 255.0.0. T his means you have 16 bits for net works and 16 bits for hosts. If you want to create eight subnets, then you need to solve for 2 s > 8. Solving for s, you can determine that you need to use the first 3 bits from the net work address to create the subnets. T he values of the first 3 bits total 224 (128 + 64 + 32), so the new subnet mask is 255. 255. 224.0. 4. A , B . T he valid private address ranges include the following: