多項選擇題A single 802.11g access point has been configured and installed in the center of a square office. A few wireless users are experiencing slow performance and drops while most users are operating at peak efficiency. What are three likely causes of this problem?（）

A. mismatched TKIP encryption
B. null SSID
C. cordless phones
D. mismatched SSID
E. metal file cabinets
F. antenna type or direction


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1.多項選擇題What are two security appliances that can be installed in a network?（）

A.ATM
B.IDS
C.IOS
D.IOX
E.IPS
F.SDM

2.多項選擇題Which of the following describes the roles of devices in a WAN?（）

A. A CSU/DSU terminates a digital local loop.
B. A modem terminates a digital local loop.
C. A CSU/DSU terminates an analog local loop.
D. A modem terminates an analog local loop.
E. A router is commonly considered a DTE device.
F. A router is commonly considered a DCE device.

4.多項選擇題Which three Layer 2 encapsulation types would be used on a WAN rather than a LAN?（）

A.HDLC
B.Ethernet
C.Token Ring
D.PPP
E.FDDI
F.Frame Relay

5.多項選擇題A Catalyst 2950 needs to be reconfigured. What steps will ensure that the old configuration is erased?（）

A. Erase flash.
B. Restart the switch.
C. Delete the VLAN database.
D. Erase the running configuration.
E. Erase the startup configuration.
F. Modify the configuration register.