Dynamic ARP Inspection (DAI):

ARP inspection verifies ARP packets against a trusted IP-to-MAC binding table to prevent ARP spoofing attacks.

DHCP snooping is required to construct the IP-to-MAC binding table dynamically.

To avoid traffic disruption, uplink ports that connect to trusted switches, DHCP servers, or routers must be explicitly configured as trusted ports for ARP inspection.

Steps to Prevent Traffic Disruption:

Trust the Uplinks: ARP inspection must treat uplink ports as trusted to allow ARP traffic from legitimate DHCP servers and upstream switches.

Enable DHCP Snooping: DHCP snooping must be enabled on Switch-2 to ensure consistent IP-to-MAC bindings upstream.

Why the Answer is Correct:

Option A: Incorrect. ARP inspection on Switch-2 is important but not required first to prevent disruption on Switch-1.

Option B: Incorrect. DHCP snooping must be enabled upstream eventually, but this alone will not stop immediate traffic disruption on Switch-1.

Option C: Correct. Switch-1 uplinks must be trusted ARP inspection ports first to allow legitimate upstream traffic and prevent ARP disruption.

Option D: Incorrect. Static bindings are not required if DHCP snooping is enabled, and they are manual, limiting scalability.

Conclusion:

To avoid traffic disruption, configure Switch-1 uplinks as trusted ARP inspection ports to ensure valid ARP traffic can pass upstream and downstream.