多项选择题

Which of the following would be considered a routing protocol？（）

A.OSPF
B.DHCP
C.SMTP
D.SNMP
E.RIP

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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

单项选择题

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

A.All hosts can communicate.
B.No hosts can communicate.
C.Half of the hosts will lose communication.
D.Only the two hosts between the failed connection will lose communication.

单项选择题

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
B.Re-enter the username and password in the VPN connection and reconnect
C.Call the broadband Internet provider to replace the SOHO router with a newer model
D.Ping the corporate VPN server to ensure it is online

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