350-601 Network Practice Question
A network engineer is configuring OSPF on a Cisco Nexus switch for a data center network. The requirement is to ensure that the switch does not become the Designated Router (DR) on a multi-access segment. Which OSPF configuration achieves this?
⚠ Common exam trap
Cisco often tests the misconception that setting a high priority (like 255) ensures a router does not become DR, when in fact it does the opposite; the trap here is confusing priority 0 (ineligible) with priority 255 (most likely to be elected).
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
✓
Set OSPF priority to 0 on the interface
Setting the OSPF priority to 0 on the interface prevents the switch from participating in the DR/BDR election process, ensuring it will never become the Designated Router (DR) or Backup Designated Router (BDR) on a multi-access segment. This is the standard method per RFC 2328 to make a router ineligible for DR/BDR status while still allowing it to form full adjacencies with the DR and BDR.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Set OSPF priority to 255 on the interface
Why it's wrong here
Priority 255 increases the chance of becoming DR.
- ✓
Set OSPF priority to 0 on the interface
Why this is correct
Priority 0 means the router will never become DR or BDR.
- ✗
Change the OSPF network type to point-to-point
Why it's wrong here
Point-to-point network type eliminates DR election, but it changes the behavior for all routers; the question asks specifically to prevent this switch from becoming DR.
- ✗
Configure the interface as passive under OSPF
Why it's wrong here
Passive interface suppresses OSPF hellos, so no adjacency is formed; it does not prevent DR election if hellos are sent.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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