单项选择题
In which solution is a router ACL used?（）
A. protecting a server frome unauthorized acces
B. controlling path selection,based on the route metric
C. reducing router CPU utilization
D. filterring packets that are passing through a router
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A. tracert address
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单项选择题
What is the function of the command switchport trunk native vlan 999 on a switch?（）
A. It designates VLAN 999 for untagged traffic.
B. It blocks VLAN 999 traffic from passing on the trunk.
C. It creates a VLAN 999 interface.
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Which IPsec security protocol should be used when confidentiality is required?（）
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B. MD5
C. PSK
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