國中教甄｜資訊科技資訊科技112 年第 78 題單選題
PTT is the most popular BBS site in Taiwan. In 2022, PTT announced that it stopped its TELNET service. Which one of the following is the main reason？
ABecause TELNET does not support the compression feature which is mandatory for modern protocols
BBecause TELNET requires more bandwidth than HTTP, PTT switches its service to websocket
CBecause TELNET is a terminal-based service and cannot provide colorful view
DBecause TELNET is an insecure connection way正確答案
D正確答案
TELNET 協定採用明文傳輸，缺乏加密機制，存在嚴重的資訊安全風險，因此 PTT 決定停止該服務。
逐選項解析
ABecause TELNET does not support the compression feature which is mandatory for modern protocols✕ 錯誤
TELNET 缺乏壓縮功能並非其被淘汰的主因，且現代協定並未強制規定必須具備壓縮功能。
BBecause TELNET requires more bandwidth than HTTP, PTT switches its service to websocket✕ 錯誤
TELNET 的頻寬消耗通常低於 HTTP，PTT 引入 WebSocket 是為了支援網頁版連線，而非因 TELNET 頻寬需求過大。
CBecause TELNET is a terminal-based service and cannot provide colorful view✕ 錯誤
DBecause TELNET is an insecure connection way✓ 正確
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