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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

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1.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.

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2.單項選擇題Two buildings on the San Jose campus of a small company must be connected to use Ethernet with a bandwidth of at least 100 Mbps. The company is concerned about possible problems from voltage potential differences between the two buildings. Which media type should be used for the connection（）。

A.UTP cable
B.STP cable
C.coaxial cable
D.fiber optic cable

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3.多項選擇題Switch ports operating in which two roles will forward traffic according to the IEEE 802.1w standard?（）

A.alternate
B.backup
C.designated
D.disabled
E.root

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4.單項選擇題Which protocol is an open standard protocol framework that is commonly used in VPNs,to provid secure end-to-end communication?（）

A.L2TP
B.IPsec
C.PPTP
D.RSA

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5.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

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