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16. Which of the following are TCP/IP protocols used at the Application layer of the OSI model?

1. IP
2. TCP
3. Telnet
4. FTP
5. TFTP

A. 1 and 3
B. 1, 3 and 5
C. 3, 4 and 5
D. All of the above

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17. What protocol is used to find the hardware address of a local device?

A. RARP
B. ARP
C. IP
D. ICMP

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18. Which of the following protocols uses both TCP and UDP?

A. FTP
B. SMTP
C. Telnet
D. DNS

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19. What is the address range of a Class B network address in binary?

A. 01xxxxxx
B. 0xxxxxxx
C. 10xxxxxx
D. 110xxxx

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