单项选择题

Which of these statements is correct regarding SSO and Cisco NSF？（）

A. Utilizing Cisco NSF in Layer 2 environments can reduce outages to one to three seconds.
B. Utilizing SSO in Layer 3 environments can reduce outages to one to three seconds.
C. Distribution switches are single points of failure causing outages for the end devices.
D. Utilizing Cisco NSF and SSO in a Layer 2 environment can reduce outages to less than onesecond.
E. NSF and SSO with redundant supervisors have the most impact on outages at the accesslayer.

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What is the recommended practice when considering VPN termination and firewall placement？（）

A. have the firewall and VPN appliance deployed in parallel
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