Go back to 642-637 - Securing Networks with Cisco Routers and Switches (SECURE) v1.0

Question :-

Which of these should you do before configuring IP Source Guard on a Cisco Catalyst switch?
enable NTP for event correlation
enable IP routing authentication
configure an access list with exempt DHCP-initiated IP address ranges
turn DHCP snooping on at least 24 hours in advance

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