NAT (Network Address Translation) allows multiple private IP addresses to share a single public IP when accessing the internet. This conserves public IPs and provides basic security by hiding internal addresses.
B. BGP is a routing protocol.
C. OSPF is a link-state IGP.
D. FHRP provides redundant gateways, not IP sharing.
References (CompTIA Network+ N10-009):
Domain: Networking Concepts — NAT, PAT, private-to-public IP mapping.
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