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單項選擇題A network administrator is planning a network installation for a large organization.The design requires 100 separate subnetworks，so the company has acquired a Class B network address.What subnet mask will provide the 100 subnetworks required， if 500 usable host addresses are required per subnet？（）

A.255.255.240.0
B.255.255.248.0
C.255.255.252.0
D.255.255.254.0
E.255.255.255.0
F.255.255.255.192

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1.單項選擇題Which command displays the CHAP authentication process as it occurs between two routers?（）

A.debug authentication
B.debug chap ppp
C.debug chap authentication
D.debug ppp authentication

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2.單項選擇題Which IEEE standard protocol is initiated as a result of successful DTP completion in a switch over FastEthernet？（）

A.802.3ad
B.802.1w
C.802.1Q
D.802.1d

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3.單項選擇題At which layer of the OSI model dose PPP perform?（）

A.Layer 3
B.Layer 4
C.Layer 2
D.Layer 5

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4.多項選擇題The network technician is planning to use the 255.255.255.224 subent mask on the network.which three valid IP addresses can the technician use for the hosts？（）

A.172.22.243.127
B.172.22.243.191
C.172.22.243.190
D.10.16.33.98
E.10.17.64.34
F.192.168.1.160

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5.多項選擇題Which three statements about VTP features are true?（）

A.When properly configured,VTP minimizes VLAN misconfigurations and configuration inconsistencies
B.Each broadcast domain on a switch can have its own unique VTP domain
C.VTP works at Layer 3 of the OSI model and requires that a management VLAN IP address be configured.
D.When properly configured,VTP maintains VLAN configuration consistency and accelerates trunk link negotiation.
E.VTP pruning is used to increase available bandwidth in trunk links
F.Client,server,and transparent are valid VTP modes
G. To configure a switch to be part of two VTP domains,each domain must have its own passwords

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