B (IP Source Guard):IP Source Guard prevents IP address spoofing at Layer 2 by binding IP-to-MAC addresses and filtering unauthorized source IPs. It operates independently of encryption, so it has no impact on encryption performance.
Other options explained:
A: MACsec adds encryption and has performance implications.
C: DHCP snooping with DAI focuses on ARP spoofing, not IP address antispoofing specifically.
D: IPsec handles encryption, which directly impacts performance.
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