CEH v12 Certified Ethical Hacker Study Guide with 750 Practice Test Questions

AppendixAnswers to Review Questions

Chapter 2: Networking Foundations

1. A.  A thermostat is an embedded device without a traditional user interface. A light bulb would have no user interface, even if it has network capabilities. A set‐top cable box would have a custom interface and not a general‐purpose one. The only device here that is a general‐purpose computing platform with a traditional user interface—screen and keyboard—is the smartphone, so it isn't part of the IoT.
2. D.  TCP uses a three‐way handshake, which is fairly heavyweight. HTTP uses TCP and adds more on top of it. ICMP is used for control messages. UDP has very little overhead and is commonly used for real‐time data transport.
3. B.  From top to bottom, the TCP/IP architecture ...