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單項(xiàng)選擇題How many subnets can be gained by subnetting 172.17.32.0/23 into a /27 mask, and how many usable host addresses will there be per subnet?（）

A.8 subnets, 31 hosts
B.8 subnets, 32 hosts
C.16 subnets, 30 hosts
D.16 subnets, 32 hosts
E.A Class B address can't be subnetted into the fourth octet.

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1.單項(xiàng)選擇題 As a network administrator，you have been instructed to prevent all traffic or iginating on the LAN from entering the R2 router.Which the following command would implement the access list on the interface of theR2 router？（）

A.access-list 101 in
B.access-list 101 out
C.ipaccess-group 101 in
D.ipaccess-group 101 out

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2.單項(xiàng)選擇題 S0/0 on R1 is configured as a multipoint interface to communicate with R2 and R3 in the hub-and-spoke Frame Relay topology shown in the exhibit. Originally, static routes were configured between these routers to successfully route traffic between the attached networks. What will need to be done in order to use RIPv2 in place of the static routes?（）

A.Configure the no ip subnet-zero command on R1, R2, and R3.
B.Dynamic routing protocols such as RIPv2 cannot be used across Frame Relay networks.
C.Configure the S0/0 interface on R1 as two subinterfaces and configure point-to-point links to R2 and R3.
D.Change the 172.16.2.0/25 and 172.16.2.128/25 subnetworks so that at least two bits are borrowed from the last octet.
E.Change the network address configuration to eliminate the discontiguous 172.16.2.0/25 and 172.16.2.128/25 subnetwork.

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3.單項(xiàng)選擇題為了允許建立一個(gè)TELNET會(huì)話，以下哪個(gè)命令集必須被配置？（）

A.
B.
C.
D.
E.
F.

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4.單項(xiàng)選擇題What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-treetopology?（）

A.lowest port MAC address
B.port priority number and MAC address.
C.VTP revision number
D.highest port priority number.
E.pathcost

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5.單項(xiàng)選擇題A network administrator wants to add a line to an access list that will block only Telnet access by the hosts on subnet 192.168.1.128/28 to the server at 192.168.1.5.What command should be issued to accomplish this task？（）

A.access-list 101 deny tcp192.168.1.1280.0.0.15192.168.1.50.0.0.0eq23 access-list 101 permit ip any any
B.access-list 101 deny tcp192.168.1.1280.0.0.240192.168.1.50.0.0.0eq23 access-list101permit ip any any
C.access-list 1 deny tcp192.168.1.1280.0.0.255192.168.1.50.0.0.0eq21 access-list1permit ip any any
D.access-list 1 deny tcp192.168.1.1280.0.0.15host192.168.1.5eq23 access-list1permit ip any any

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