CompTIA Network+ Practice Tests, 3rd Edition

Appendix Answers to Review Questions

Chapter 1: Networking Concepts

1. B. The Ethernet (or IEEE 802.3) protocol at the Data link layer uses MAC addresses to identify computers on the local network. MAC addresses are coded into the firmware of physical network interface adapters by the manufacturer. The Physical layer deals with signals and is not involved in addressing. The IP protocol at the Network layer has its own addressing system. The Transport layer protocols are not involved in addressing.
2. E. ISO developed and published the OSI model to serve as a conceptual model for software and hardware developers. The ITU-T, formerly known as the CCITT, coordinates the development and advancement of international telecommunication networks and services. ...