ARP requests and replies do not require authentication.

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Multiple Choice

ARP requests and replies do not require authentication.

Explanation:
ARP is used to map IP addresses to MAC addresses on a local network, and it was designed as a lightweight protocol without any built-in authentication. When a device needs to learn the MAC for an IP, it broadcasts an ARP request; the owner of that IP responds with an ARP reply containing its MAC. Because there’s no cryptographic check or verification mechanism in ARP, these messages don’t require authentication by design. This lack of authentication makes ARP susceptible to spoofing, where a malicious host can send fraudulent ARP replies to poison the cache of other devices. To mitigate this, networks can use static ARP entries or protective measures like Dynamic ARP Inspection and DHCP snooping to validate ARP messages and reduce spoofing risks.

ARP is used to map IP addresses to MAC addresses on a local network, and it was designed as a lightweight protocol without any built-in authentication. When a device needs to learn the MAC for an IP, it broadcasts an ARP request; the owner of that IP responds with an ARP reply containing its MAC. Because there’s no cryptographic check or verification mechanism in ARP, these messages don’t require authentication by design. This lack of authentication makes ARP susceptible to spoofing, where a malicious host can send fraudulent ARP replies to poison the cache of other devices. To mitigate this, networks can use static ARP entries or protective measures like Dynamic ARP Inspection and DHCP snooping to validate ARP messages and reduce spoofing risks.

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