单项选择题

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

A.Sector
B.Patch
C.Yagi
D.Omni-Directional

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单项选择题

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

A.IGMP
B.SNMP
C.SMTP
D.ICMP

单项选择题

A user receives an email slating that their account was compromised and there is a need to verify
account credentials by submitting the correct information on a website.
Which of the following security threats is occurring?（）

A. Phishing
B. Smurf attack
C. Denial of service
D. Man-in-the-middle

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Which of the following protocols should be used to monitor network performance?（）

A.SNTP
B.SMTP
C.HTTP
D.SNMP