312-50V10 · Question #780
DHCP snooping is a great solution to prevent rogue DHCP servers on your network. Which security feature on switchers leverages the DHCP snooping database to help prevent man-in-the- middle attacks?
The correct answer is B. Dynamic ARP Inspection (DAI). Dynamic ARP Inspection (DAI) uses the DHCP snooping binding table to validate ARP packets and block ARP spoofing attacks used in man-in-the-middle scenarios.
Question
DHCP snooping is a great solution to prevent rogue DHCP servers on your network. Which security feature on switchers leverages the DHCP snooping database to help prevent man-in-the- middle attacks?
Options
- ASpanning tree
- BDynamic ARP Inspection (DAI)
- CPort security
- DLayer 2 Attack Prevention Protocol (LAPP)
How the community answered
(20 responses)- A5% (1)
- B70% (14)
- C10% (2)
- D15% (3)
Why each option
Dynamic ARP Inspection (DAI) uses the DHCP snooping binding table to validate ARP packets and block ARP spoofing attacks used in man-in-the-middle scenarios.
Spanning Tree Protocol prevents Layer 2 switching loops and does not use the DHCP snooping database or provide any protection against ARP-based man-in-the-middle attacks.
DAI intercepts ARP requests and replies on untrusted switch ports and validates each sender's IP-to-MAC mapping against the DHCP snooping binding table. Packets with invalid or spoofed ARP mappings are dropped, preventing an attacker from redirecting traffic through their machine to perform a man-in-the-middle attack.
Port security restricts which MAC addresses can communicate on a port but does not consult the DHCP snooping database to validate IP-to-MAC bindings carried inside ARP packets.
Layer 2 Attack Prevention Protocol (LAPP) is not a real or standardized networking security feature - it is a fictitious distractor.
Concept tested: Dynamic ARP Inspection using DHCP snooping binding table
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_arp/configuration/xe-16/arp-xe-16-book/arp-dynamic-arp-inspect.html
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