单项选择题

Which of the following network services is responsible for mapping names to IP addresses？（）

A.DHCP
B.DNS
C.IMAP4
D.Telnet

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单项选择题

When one connection to a host fails in a full mesh network， which of the following is true？（）

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A user connects to the companys intranet server via a VPN connection from a small office / home office （SOHO） using the broadband service. One day， the user cannot successfully connect to the VPN and receives an error message that states "Username and password are invalid on the domain." Which of the following should be done to correct this problem？（）

A.Call the corporate help desk to have the VPN server rebooted
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C.Call the broadband Internet provider to replace the SOHO router with a newer model
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