單項選擇題What is true about SYN cookies？（）

A. All TCPoptions are supported， such as largewindows.
B. The server can have more than8 unique MSS values.
C. SYN cookies are not implemented as a method of defending against SYN floods.
D. SYN cookies are implemented as a method of defending against SYN floods.


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1.單項選擇題Of the threats discussed below， what is the main advantage of using Cisco Secure Desktop which is part of the Cisco ASA VPN solution？（）

A. Secure desktop will create a completely separate computing environment thatwill be deleted when you are done.This ensures that no confidential data has been left on the shared/public computer.
B. Secure desktop is used to protect access to your registry and systemfiles when browsing to SSL/VPN protectedpages.
C. Secure Desktop ensures that an SSLprotected password cannotbe exploitedby a man in the middle attackusing a spoofed certificate.
D. Secure desktop hardens the operating system of the machines you are using at the time secure desktop islaunched.

2.多項選擇題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.

3.多項選擇題What technologies are included inAnti-X？ （）

A. Content and URL filtering
B. Intrusion Prevention
C. VPN
D. Virus and Phishing protection
E. Content Caching

4.單項選擇題CSA protects your host by： （）

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

5.多項選擇題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.