单项选择题

Which of the following regulates the amount of network traffic a single node receives in a servercluster?（）

A. Load balancer
B. Proxy server
C. Content filter
D. Quality of service

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A standard installation for wireless will use which of the following antenna types?（）

A.Sector
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单项选择题

Which of the following protocols requests membership to a multicast group?（）

A.IGMP
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单项选择题

A user receives an email slating that their account was compromised and there is a need to verify
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A. Phishing
B. Smurf attack
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