Which three of the protocols below belong to the application layer? (Select three answer choices) A. ARP B. HTTPS C. SMTP D. CDP

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问题 Which three of the protocols below belong to the application layer? (Select three answer choices)
A. ARP
B. HTTPS
C. SMTP
D. CDP
E. TFTP
F. ICMP

选项

答案B,C,E

解析 Explanation:
The application layer is the highest OSI layer, and protocols at this layer are end-user oriented. HTTPS so people can get information on the internet, SMTP so people can manage networks, and TFTP so people can download files.

Incorrect Answers:
A, D, F. ARP, CDP, ICMP are protocols that equipment like routers and switches use to communicate with themselves, and belong to lower levels on the model.

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Which three of the protocols below belong to the application layer? (Select three answer choices) A. ARP B. HTTPS C. SMTP D. CDP

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