Cisco Certified Entry Networking Technician (CCENT) Practice Exam

What is the effect of enabling port security on a switch port?

It encrypts all traffic on the port. It enables all MAC addresses to connect with no shutdown behavior. It restricts access by MAC address and can shut down the port on violations. It changes the VLAN of the port dynamically to match traffic.

Correct Answer:

It restricts access by MAC address and can shut down the port on violations.

Explanation:

Port security controls which devices can use a switch port by binding specific MAC addresses to that port, limiting how many unique addresses can send frames. If a frame from a MAC address that isn’t allowed appears, or if the number of allowed addresses is exceeded, the switch can take a violation action, most commonly shutting the port down to prevent access. This helps protect the network from unauthorized devices and MAC spoofing. It does not encrypt traffic, does not allow every MAC address to connect, and does not dynamically change the VLAN on the port.

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