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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3.单项选择题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
D. The switch needs to be setup to forward data traffic to the Internet

8.单项选择题Which of the following DNS record types provides the hostname to IP address mapping?()

A. A record
B. NS record
C. CNAME record
D. MX record

9.单项选择题Which of the following should be updated when new computers are purchased?()

A. Asset management
B. Change management
C. Cable management
D. Baselines

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Which of the following defines access for a network?()

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An administrator attempts to open a web page and sees the following error: 'Error 404: Page not found'. The administrator then uses the ping command and finds that the default gateway cannot be pinged.At which of the following layers does the problem MOST likely reside?()

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Which of the following DNS record types provides the hostname to IP address mapping?()

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