单项选择题

A network at a small business utilizes a star topology and is experiencing frequent collisionsamong data packets. Which of the following devices is MOST likely being used?（）

A. Unmanaged switch
B. Hardware firewall
C. Hub
D. Managed switch

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单项选择题

Which of the following is the full range of address block 192.16876.0/23?（）

A.192.168.76.0-192.168.77.255
B.192.168.76.0-192.168.76.255
C.192.168.76.0-192.168.76.23
D.192.168.76.0-192.168.780

单项选择题

Which of the following improves wireless performance by allowing only one wireless transmissionon the network at a time?（）

A. CSMA/CA
B. CSMA/CD
C. Wireless encryption
D. Wireless bonding

单项选择题

An administrator wants to limit access of a wireless network without requiring authorized users to
enter a password or network key.
Which of the following methods would MOST likely be implemented on the wireless network?（）

A. Disable SSID
B. WPA
C. MAC filtering
D. RAS