单项选择题

Which of the following is STP BEST identified by under the cable sheath？（）

A.Number of twists in wires
B.Number of wires
C.Lubricant
D.Foil

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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

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.