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单选题
A common technique used to prevent the unauthorized network devices from sending trafficacross a network is port（）
A
spanning
B
address translation
C
mirroring
D
authentication
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A common technique used to prevent the unauthorized network devices from sending trafficacross a network is port（）A、spanningB、address translationC、mirroringD、authentication
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单选题A network administrator wants to control which user hosts can access the network based on their MAC address. What will prevent workstations with unauthorized MAC addresses from connecting to the network through a switch?（）A
BPDUB
Port securityC
RSTPD
STPE
VTPF
Blocking mode
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单选题Why would a network administrator configure port security on a switch（）。A
to prevent unauthorized Telnet access to a switch portB
to limit the number of Layer 2 broadcasts on a particular switch portC
to prevent unauthorized hosts from accessing the LAND
to protect the IP and MAC address of the switch and associated portsE
to block unauthorized access to the switch management interfaces over common TCP ports
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单选题Why would a network administrator configure port security on a switch?（）A
To prevent unauthorized Telnet access to a switch port.B
To limit the number of Layer 2 broadcasts on a particular switch port.C
To prevent unauthorized hosts from accessing the LAN.D
To protect the IP and MAC address of the switch and associated ports.E
To block unauthorized access to the switch management interfaces over common TCP ports.
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多选题Which two protocols are used by bridges and/or switches to prevent loops in a layer 2 network?（）A802.1dBVTPC802.1qDSTPESAP
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单选题The network administrator has enabled BPDU guard on the LAN. Why is an effective way to prevent an unauthorized rogue switch from altering the spanning-tree topology of this network？ （）A
BPDU guard can be used to prevent invalid BPDUs from propagating throughout the network. B
BPDU guard can guarantee proper selection of the root bridge.C
BPDU guard can be utilized to prevent the switch from transmitteing BPDUs and incorrectly altering the root bridge election.D
BPDU guard can be utilized along with PortFast to shut down ports when a switch is connected to the port.E
None of the other alternatives apply
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