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Cisco CCNA/CCENT Exam 640-802, 640-822, 640-816 Preparation Kit by Dale Liu

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1. What is used by a host to determine the host ID on a given data packet?
A. The IP header
B. The subnet mask
C. The address class
D. The MAC address
Correct Answer & Explanation:B. The subnet mask is what allows a host or router to determine where to split the address in its network and host constituent parts.
Incorrect Answers & Explanations:A, C, and D. Answer A is incorrect because the IP header is a part of the IP packet that contains version, source, and destination address information, among the other things. Answer C is incorrect because the address class would be used in a classfull environment to determine where the split occurs between host and network ID. But a typical classless environment requires a subnet mask. Finally, answer D is ...

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