E (Infrastructure ACLs): iACLs control what traffic can reach network infrastructure devices, directly securing the data plane.
G (Routing Protocol Authentication): Prevents malicious or spoofed routing updates which directly protect data plane routing decisions.
Why other options are incorrect:
A: Warning banners are management plane hardening.
B: Redundant AAA is management/control plane hardening.
C: CPPr protects the control plane.
D: SNMPv3 secures management plane.
F: Disabling unused services typically applies to management plane or control plane, not data plane.
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