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多項(xiàng)選擇題Which three IP addresses can be assigned to hosts if the subnet mask is /27 and subnet zero is usable？（）

A. 10.15.32.17
B. 17.15.66.128
C. 66.55.128.1
D. 135.1.64.34
E. 129.33.192.192
F. 192.168.5.63

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1.多項(xiàng)選擇題The network administrator has been asked to give reasons for moving from ipv4 to ipv6. what are two validreasons for adopting ipv6 over ipv4？（）

A.telnet access does not require a password
B.nat
C.no broadcast
D.chanage of destination address in the ipv6 header
E.chanage of source address in the ipv6 header
F.autoconfiguration

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2.單項(xiàng)選擇題The network administrator has discovered that the power supply has failed on a switch in the company LAN and that the switch has stopped functioning. It has been replaced with a Cisco Catalyst 2950 series switch. What must be done to ensure that this new switch becomes the root bridge on the network？（）

A. Lower the bridge priority number.
B. Change the MAC address of the switch.
C. Increase the VTP revision number for the domain.
D. Lower the root path cost on the switch ports.
E. Assign the switch an IP address with the lowest value.

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3.單項(xiàng)選擇題which command allows you to verify the encapsulation type （CISCO OR IETF） for a frame relay link？（）

A.show frame-relay map
B.show frame-relay lmi
C.show inter serial
D.show frame-relay pvc

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4.單項(xiàng)選擇題As a CCNA candidate, you must have a firm understanding of the IPv6 address structurE.Refer to IPv6 address, could you tell me how many bits are included in each filed?（）

A.24
B.4
C.3
D.16

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5.單項(xiàng)選擇題What is the alternative notation for the IPV6 address B514：82C3：0000：0000：0029：EC7A：0000：EC72？（）

A.B514：82C3：0029：：EC7A：0000：EC72
B.B514：82C3：0029：EC7A：EC72
C.B514：82C3：：0029：EC7A：0：EC72
D.B514：82C3：：0029：EC7A：EC72

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