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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An administrator replaced a router with a switch. End users are able to access network shares butare not able to access the Internet. Which of the following is the BEST explanation why the usersare unable to access the Internet?（）
A. Router routes traffic between different networks and a switch does not
B. The new switch is faulty and needs to be replaced and configured correctly
C. The firewall needs to be setup to allow traffic to reach the Internet
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