多项选择题
Which three security concerns can be addressed by a tunnel mode IPsec VPN secured by AH?（） (Choose three.)
A. data integrity
B. data confidentiality
C. data authentication
D. outer IP header confidentiality
E. outer IP header authentication
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单项选择题
Which configuration keyword ensures that all in-progress sessions are re-evaluated upon committing a security policy change?（）
A. policy-rematch
B. policy-evaluate
C. rematch-policy
D. evaluate-policy
