When ARP is set to reply-only on a MikroTik interface, the router will not respond to any ARP requests unless a matching static entry exists in the /ip arp list. It will also not learn new dynamic entries — only pre-defined static IP-MAC pairs will be accepted and responded to.
Option breakdown:
A.✘Incorrect – The router doesn't operate solely based on MAC, but on IP-MAC pairings.
B.✔Correct – Only combinations that match entries in /ip arp are accepted.
C.✘Incorrect – reply-only mode disables dynamic ARP learning.
D.✘Incorrect – Again, no new IPs are dynamically added.
E.✘Incorrect – Static ARP is enforced by IP-MAC pairs, not just IP.
Extract from MTCNA Course Material – ARP Modes:
“Reply-only mode will respond to ARP requests only if a matching static ARP entry exists. No dynamic learning occurs.”
Extract from René Meneses Study Guide – ARP Explanation:
“Use ARP=reply-only to force strict IP-MAC pairing. It prevents spoofing but requires all valid pairs to be preconfigured.”
Extract from MikroTik Wiki – ARP Settings:
“reply-only: Only respond to ARP requests if the requester matches a static /ip arp entry. New dynamic entries are not created.”
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