单项选择题
Which of the following protocols requests membership to a multicast group?（）
A.IGMP
B.SNMP
C.SMTP
D.ICMP
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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 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 -
单项选择题
An administrator is setting up a security camera that will send the same feed to twelve of the twenty workstations on the network. Which of the following addressing schemes was designed for this scenario?（）
A.Multicast
B.Unicast
C.Broadcast
D.Peer-to-peer
