多项选择题
Which statements are true concerning NAT？ （）
A. NAT provides 1 to manyaddress mapping.
B. NAT provides 1 to 1 address mapping.
C. NAT is only useful forTCP/UDP and ICMP traffic.
D. NAT can be used for all IP traffic.
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B. Intrusion Prevention
C. VPN
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CSAprotectsyourhostby：（）
A. Preventing browsers from opening network sockets inlistening state.
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ChoosethemostcorrectstatementsaboutSMTP/ESMTP.（）
A. Open mail relays are often used for spamming.
B. ESMTP does NOT provide more security features than SMTP
C. SMTPdoes provide authenticated email sending."
D. Worms often spread via SMTP.
