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Networking Fundamentals · Intermediate

Rogue DHCP Server

An unauthorized DHCP server that hands out incorrect addressing, causing outages or enabling on-path attacks.

Definition

Rogue servers may be consumer routers plugged in by users or attacker devices handing out a malicious gateway or DNS server. DHCP snooping on switches blocks DHCP server messages from untrusted ports.

Example

Users suddenly get 192.168.0.x addresses after someone plugs in a home router.

Exam tip

DHCP snooping is the mitigation.

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