Re: [問題] 請問幾個問題
※ 引述《wakke (衝阿 去掉C)》之銘言:
: 23.Which of the following about modems is wrong?
: (A)modem converts analog into digital and then transmit
: it over telephone lines
: (B)today’s technology allows 56Kbps transmission rate
: (C)in the pervious item, bps stands for bit-per-second
: (D)modem is short for modulate-demodulate
: (E)all of the above are correct
: 這題的答案應該是A吧??我認為應該是 Digital to analog 答案是給E
A 是說轉成數位後用電話線傳輸
實際上是相反的
電話你在說話時,是直接把聲音的波形轉成電流傳出去
所以是類比的
: 30.A technology that uses the public Internet backbone as a channel
: for private data communication is
: (A)ISDN (B)PPTP (C)VPN( D)DSL (E)cable modem.
: 答案是不是C阿 還有請問B是什麼東東^^??還是亂掰的字眼
C 沒錯
PPTP:http://en.wikipedia.org/wiki/PPTP
算是 VPN 的一種,不過不安全
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