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  3. Which Layer 4 protocol is used for a Telnet connection between two Ezonexam routers? A. IP B. ICMP C. DNS D. TCP E. UDP F. RTP

Which Layer 4 protocol is used for a Telnet connection between two Ezonexam routers? A. IP B. ICMP C. DNS D. TCP E. UDP F. RTP

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问题 Which Layer 4 protocol is used for a Telnet connection between two Ezonexam routers?
A. IP
B. ICMP
C. DNS
D. TCP
E. UDP
F. RTP
选项
答案D
解析 Explanation:
TCP is a reliable connection-oriented protocol. TCP uses acknowledgments, sequencing, and flow control to ensure reliability. Telnet uses TCP port 23.
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