单项选择题
Which of the following WAN protocols is a packet switching technology?（）
A.Frame Relay
B.POTS
C.PSTN
D.ISDN
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单项选择题
Using network monitoring tools would allow an administrator to do which of the following?（）
A. Configure offline devices
B. Examine performance issues
C. Install additional software and updates
D. View syslog events
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单项选择题
Determining when to retransmit frames is an example of which of the following Ethernet properties?（）
A. Carrier sense
B. Collision detection
C. Multiple access points
D. Collision avoidance -
单项选择题
Which of the following address formats uses 32-bit addressing?（）
A.IPv4
B.MAC address
C.IPv6
D.Host address
