hardMultiple Choice
350-401 Practice Question: Runs the following command on Router R8: R8# show…
A network engineer runs the following command on Router R8:
R8# show ip pim neighbor vrf CUSTOMER-F Neighbor Interface Uptime/Expires Ver DR 10.0.3.2 GigabitEthernet0/0.700 02:00:00/00:01:30 v2 1/ DR 10.0.4.2 GigabitEthernet0/0.800 01:30:00/00:01:45 v2 0/ NDR (BDR)
Based on this output, what can be concluded?
⚠ Common exam trap
Cisco often tests the misinterpretation of the DR/BDR column, where candidates mistakenly assume the neighbor with 'BDR' is the DR, or that PIM is not running when neighbors are present.
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
✓
PIM is enabled in VRF CUSTOMER-F with a DR and BDR
The output shows two PIM neighbors (10.0.3.2 and 10.0.4.2) with their respective interfaces, uptimes, and DR/BDR roles. The presence of a DR (Designated Router) and BDR (Backup Designated Router) indicates that PIM is enabled and operating in VRF CUSTOMER-F, with the DR being 10.0.3.2 (as shown by '1/ DR') and the BDR being 10.0.4.2 (as shown by '0/ NDR (BDR)'). Therefore, option C is correct.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
PIM is not configured for VRF CUSTOMER-F
Why it's wrong here
The output displays PIM neighbors for VRF CUSTOMER-F, with both routers listed with their addresses, which is only possible if PIM is actively enabled and forming adjacencies on that VRF. The presence of neighbor entries, regardless of DR/BDR status, proves PIM configuration is active. Therefore the claim that PIM is not configured is contradicted by the show output itself.
- ✗
The DR is 10.0.4.2
Why it's wrong here
In the PIM neighbor table, the "1/" prefix before the neighbor address indicates the designated router (DR) role, and 10.0.3.2 is the one marked with "1/ DR", not 10.0.4.2. 10.0.4.2 appears as a neighbor but without the DR marker, so it is the Backup DR (BDR). Thus claiming 10.0.4.2 is DR misreads the role flag in the output.
- ✓
PIM is enabled in VRF CUSTOMER-F with a DR and BDR
Why this is correct
The output explicitly shows two PIM neighbors within VRF CUSTOMER-F, and the role column designates 10.0.3.2 as DR and 10.0.4.2 as BDR, confirming that PIM is enabled and operating normally on this VRF. The DR/BDR election is functional, which verifies the multicast routing control plane is active. This matches the expected behavior for a properly configured VRF with PIM.
- ✗
Both neighbors are using PIM version 1
Why it's wrong here
The Ver column in the PIM neighbor table lists v2 for both 10.0.3.2 and 10.0.4.2, so they are using PIM version 2, not version 1. PIM version 2 is the current standard, carrying more efficient hello packets and supporting explicit DR election priorities. The claim of version 1 is definitively false based on the version field.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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