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 -
单项选择题
Which of the following protocols should be used to monitor network performance?（）
A.SNTP
B.SMTP
C.HTTP
D.SNMP
