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單項選擇題How many collision domains are shown（）。

A.one
B.two
C.three
D.four
E.six
F.fourteen

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1.單項選擇題 The Frame Relay network in the diagram is not functioning properly.What is the cause of the problem？（）

A.The Gallant router has the wrong LM Itype configured
B.Inverse ARP is providing the wrong PVC information to the Gallant router
C.The S3 interface ofthe Steele router has been configured with the frame-relay encapsulation ietf command
D.The frame-relay map statement in the Attalla router for the PVC to Steele is not correct
E.The IP address on the serial interface of the Attalla router is configured incorrectly

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2.多項選擇題Which are valid modes for a switch port used as a VLAN trunk (Choose three.)（）。

A.transparent
B.auto
C.on
D.desirable
E.blocking
F.forwarding

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3.單項選擇題Which statement is true about full-duplex Ethernet in comparison to half-duplex Ethernet（）。

A.Full-duplex Ethernet consists of a shared cable segment. Half-duplex Ethernet provides a point-to-point link.
B.Full-duplex Ethernet uses a loopback circuit to detect collisions. Half-duplex Ethernet uses a jam signal.
C.Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth.
D.Full-duplex Ethernet uses two wires to send and receive. Half-duplex Ethernet uses one wire to send and receive.

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4.多項選擇題The network 172.25.0.0 has been divided into eight equal subnets. Which of the following IP addresses can be assigned to hosts in the third subnet if the ip subnet-zero command is configured on the router? （）

A.172.25.78.243
B.172.25.98.16
C.172.25.72.0
D.172.25.94.255
E.172.25.96.17
F.172.25.100.16

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5.單項選擇題Why does RouterA show multiple unequal cost paths to network 192.168.81.0/24（）。

A.A variance was configured for EIGRP autonomous system 109.
B.The EIGRP topology table displays all routes to a destination.
C.The EIGRP topology table shows only backup routes to a destination.
D.Multiple floating static routes were configured to network 192.168.81.0 via interface Serial0.

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