Refer to the exhibit. What is the effect of this configuration?

The correct answer is A. The switch port interface trust state becomes untrusted. Dynamic ARP inspection (DAI) is a security feature that validates ARP packets in a network. It intercepts, logs, and discards ARP packets with invalid IP-to-MAC address bindings. This capability protects the network from certain man-in-the-middle attacks. After enabling DAI, all

Submitted by eva_at· Mar 5, 2026Security Fundamentals

Question

Refer to the exhibit. What is the effect of this configuration?

Options

AThe switch port interface trust state becomes untrusted
BThe switch port remains administratively down until the interface is connected to another switch
CDynamic ARP inspection is disabled because the ARP ACL is missing
DThe switch port remains down until it is configured to trust or untrust incoming packets

How the community answered

(19 responses)

A
74% (14)
B
5% (1)
C
16% (3)
D
5% (1)

Explanation

Dynamic ARP inspection (DAI) is a security feature that validates ARP packets in a network. It intercepts, logs, and discards ARP packets with invalid IP-to-MAC address bindings. This capability protects the network from certain man-in-the-middle attacks. After enabling DAI, all ports become untrusted ports.

Topics

#Dynamic ARP Inspection#Switch port trust state#Layer 2 security

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