101普考計概 101警察與鐵路特考計概 2題 - 普考
By Zora
at 2013-06-03T20:20
at 2013-06-03T20:20
Table of Contents
101普考
31 下列 SQL 語法何者錯誤?
A select count(*) from students
B select MAX(age) from students
C select name, MAX(age) from students
D select name, MAX(age) from students group by name
ANS:(C)
雖然C查出來的結果怪怪的 但應該不至於出錯吧@@
之前問過了,只是沒求到解答>""<
101鐵特
33.以下有關防火牆(firewall)的敘述,何者錯誤?
(A)封包過濾防火牆(packet filter firewall)很難防禦「IP 位址偽裝」攻擊
(B)應用代理防火牆(application-proxy gateway firewall)可以防禦「阻斷服務」攻擊
(C)應用代理防火牆(application-proxy gateway firewall)可以掃描電子郵件
(D)狀態檢查防火牆(stateful inspection firewall)依靠狀態記憶執行存取控制,不只
依據靜態規則
ANS:(B)
應用代理防火牆可以過濾封包內容,算是防護最徹底的防火牆,而DOS在做
3 way handskake時,Hacker方只發SYN 不發ACK,使SERVER忙於處理,而一直發
SYN+Ack
要求發方回應,而無法提供別人服務 是因為DOS發的封包內容沒錯,
而是錯在Hacker方一直發封包的行為??還是有別的原因??懇請大大門解惑
--
All Comments
By Dora
at 2013-06-05T00:23
at 2013-06-05T00:23
By David
at 2013-06-05T22:44
at 2013-06-05T22:44
By Vanessa
at 2013-06-09T13:38
at 2013-06-09T13:38
By Xanthe
at 2013-06-10T12:20
at 2013-06-10T12:20
By Cara
at 2013-06-12T08:29
at 2013-06-12T08:29
Related Posts
高普考的各科平均
By Anonymous
at 2013-06-03T16:46
at 2013-06-03T16:46
鐵路特考的考前規劃
By Hedy
at 2013-06-03T08:47
at 2013-06-03T08:47
司法特考 刑法問題
By Thomas
at 2013-06-03T04:09
at 2013-06-03T04:09
最後一個月 共同科目該怎麼K
By Jake
at 2013-06-03T01:06
at 2013-06-03T01:06
考上海巡特考有關疑問
By Todd Johnson
at 2013-06-02T23:19
at 2013-06-02T23:19