Question 1000
A static print server loses connectivity after ARP inspection is enabled without documenting its fixed address mapping. Before changing security policy, what evidence should the engineer examine FIRST?
Explanation
Correct Answer
Inspect DHCP snooping bindings or static ARP ACLs, trusted links, validation drops, and legitimate static IP exceptions. This checks the relevant condition before an engineer modifies production access or detection behavior. DAI relies on trustworthy binding information; enabling inspection without handling static addressing can interrupt legitimate users. The controlled response would be: Use Dynamic ARP Inspection with reliable IP-to-MAC bindings to reject forged ARP claims on untrusted access interfaces. Situation: A static print server loses connectivity after ARP inspection is enabled without documenting its fixed address mapping.
Incorrect Answers
Inspect source and destination zone matching, network objects, application identification, default action, policy order, and hit counts. This evidence addresses FTD access control rule ordering; it would not establish the primary issue here. The diagnostic evidence needed for this scenario is: Inspect DHCP snooping bindings or static ARP ACLs, trusted links, validation drops, and legitimate static IP exceptions. Situation: A static print server loses connectivity after ARP inspection is enabled without documenting its fixed address mapping.
Inspect endpoint identity assignments, VLAN membership, SGT propagation, trustsec matrix rules, and routed reachability. This evidence addresses VLAN segmentation and SGT policy; it would not establish the primary issue here. The diagnostic evidence needed for this scenario is: Inspect DHCP snooping bindings or static ARP ACLs, trusted links, validation drops, and legitimate static IP exceptions. Situation: A static print server loses connectivity after ARP inspection is enabled without documenting its fixed address mapping.
Inspect ingress and internal traffic paths, application dependencies, firewall capabilities, and current east-west allow rules. This evidence addresses North south versus east west segmentation; it would not establish the primary issue here. The diagnostic evidence needed for this scenario is: Inspect DHCP snooping bindings or static ARP ACLs, trusted links, validation drops, and legitimate static IP exceptions. Situation: A static print server loses connectivity after ARP inspection is enabled without documenting its fixed address mapping.


