多項(xiàng)選擇題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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A. Content and URL filtering
B. Intrusion Prevention
C. VPN
D. Virus and Phishing protection
E. Content Caching

2.單項(xiàng)選擇題CSA protects your host by： （）

A. Preventing browsers from opening network sockets inlistening state.
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C. Preventingusers from entering unencrypted passwords
D. Preventing browsers from acting as client to webservers.

3.多項(xiàng)選擇題Choose the most correct statements about SMTP/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.

4.單項(xiàng)選擇題Cisco Clean Access ensures that computers connecting to your network have which of the following？（）

A. No vulnerable applications or operating systems
B. No viruses or worms
C. Appropriate security applications and patch levels
D. Current IPS signatures
E. Cisco Security Agent

5.單項(xiàng)選擇題Which of these is the best way to provide sender non-repudiation？（）

A. pre-sharedkey
B. secure hash
C. SSL
D. RSA signature