單項選擇題A receiving host computes the checksum on a frame and determines that the frame is damaged.Theframe is then discarded.At which OSI layer did this happen?()

A.session
B.network
C.physical
D.datalink
E.transport


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1.多項選擇題Which two statements are true regarding EIGRP?()

A.Passive routes are in the process of being calculated by DUAL.
B.EIGRP supports VLSM,route summarization,and routing update authentication.
C.EIGRP exchanges full routing table information with neighboring routers with every update.
D.If the feasible successor has a higher advertised distance than the successor route,it becomes theprimary route.
E.A query process is used to discover a replacement for a failed route if a feasible successor is not identified from the current routing information.

4.單項選擇題Which command can be used to verify the DLCI destination address in a Frame Relay static configuration?()

A.show frame-relay end-to-end
B.show frame-relay map
C.show frame-relay lmi
D.show frame-relay pvc

5.多項選擇題As a frame leaves a Layer 3 device,the Layer 2 encapsulation information is changed from what it was when it entered the device. For what two reasons can this happen?()

A.The data is moving from 10BASE-TX to 100BASE-TX.
B.The WAN encapsulation type has changed.
C.The data format has changed from analog to digital.
D.The source and destination hosts are in the same subnet.
E.The source and destination MAC addresses have changed.

9.單項選擇題Which command sets and automatically encrypts the privileged enable mode password?()

A.enbale password c1sco
B.secret enable c1sco
C.password enable c1sco
D.enable secret c1sco

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