200-101 Question #199: Real Exam Question with Answer & Explanation

The correct answer is C: switch(config-if)#switchport mode access switch(config-if)#switchport port-security maximum 1. A hub forwards traffic from multiple devices through a single uplink port, meaning the switch port connected to a hub will see MAC addresses from all devices behind it. To prevent hub usage, configure the port as an access port ('switchport mode access') and limit it to a maximum

Question

Which set of commands is recommended to prevent the use of a hub in the access layer?

Options

Aswitch (config-if)#switchport mode trunk switch (config-if)#switchport port-security maximum 1
Bswitch(config-if)#switchport mode trunk switch(config-if)#switchport port-security mac-address 1
Cswitch(config-if)#switchport mode access switch(config-if)#switchport port-security maximum 1
Dswitch(config-if)#switchport mode access switch(config-if)#switchport port-security mac-address 1

Explanation

A hub forwards traffic from multiple devices through a single uplink port, meaning the switch port connected to a hub will see MAC addresses from all devices behind it. To prevent hub usage, configure the port as an access port ('switchport mode access') and limit it to a maximum of one MAC address ('switchport port-security maximum 1'). If a hub is plugged in, multiple MAC addresses will appear on the port, violating the port-security policy and causing the port to err-disable. Trunk mode (options A and B) is inappropriate for access layer endpoints. Option D specifies a static MAC address, which prevents any device other than a pre-defined one from connecting-this is more restrictive than needed and impractical for general use.

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