350-601 Security Practice Question
A network administrator suspects that a rogue DHCP server is active on the data center network. The switches are Cisco Nexus 9000 series running NX-OS. Which configuration should be applied to prevent DHCP spoofing?
⚠ Common exam trap
Cisco often tests the distinction between DHCP snooping (which blocks rogue DHCP servers) and DAI or IPSG (which rely on DHCP snooping but address different threats), leading candidates to confuse the security feature with its prerequisite.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable DHCP snooping globally and configure uplink ports as trusted.
DHCP snooping is the correct defense against rogue DHCP servers because it filters DHCP messages on untrusted ports and allows only DHCP replies from trusted uplink ports. By enabling DHCP snooping globally and configuring uplink ports as trusted, the switch will drop DHCPOFFER and DHCPACK messages received on access ports, preventing a rogue server from handing out malicious IP configurations.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable dynamic ARP inspection on all VLANs.
Why it's wrong here
DAI prevents ARP spoofing, not DHCP.
- ✗
Enable IP source guard on all access ports.
Why it's wrong here
IP source guard prevents IP spoofing but requires DHCP snooping.
- ✓
Enable DHCP snooping globally and configure uplink ports as trusted.
Why this is correct
DHCP snooping filters DHCP offers from untrusted ports.
- ✗
Enable MAC port security on all access ports.
Why it's wrong here
MAC port security does not prevent DHCP spoofing.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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