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350-401 Practice Question: Given the following partial configuration on a…
Given the following partial configuration on a Cisco IOS-XE router:
ip pim rp-address 10.0.0.1 10 access-list 10 permit 224.0.0.0 0.255.255.255
!
interface GigabitEthernet0/0 ip pim sparse-mode
!
What is the effect of this configuration?
⚠ Common exam trap
Cisco often tests the misconception that the ACL in the 'ip pim rp-address' command must exclude the reserved link-local range (224.0.0.0/24), but in fact the command accepts any ACL, and the router will apply the RP to all matching groups, including the link-local range, even though those groups are not typically forwarded.
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
✓
The router will use 10.0.0.1 as the RP for all multicast groups from 224.0.0.0 to 224.255.255.255, and the interface will operate in sparse-mode.
The configuration statically assigns 10.0.0.1 as the RP for multicast groups matching access-list 10, which permits the range 224.0.0.0 through 224.255.255.255 (a /8 prefix). The interface GigabitEthernet0/0 is set to PIM sparse-mode, which is required for sparse-mode operation. This combination allows the router to use the static RP for groups in that range, and the interface will participate in sparse-mode multicast forwarding.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The router will use 10.0.0.1 as the RP for all multicast groups from 224.0.0.0 to 224.255.255.255, and the interface will operate in sparse-mode.
Why this is correct
Correct. The static RP is defined for the group range specified in ACL 10, and the interface is in sparse-mode.
- ✗
The router will ignore the static RP because the ACL includes the reserved link-local range (224.0.0.0/24).
Why it's wrong here
Incorrect. The router will still use the static RP for all groups in the ACL, including the link-local range, though this is not recommended.
- ✗
The interface must also be configured with 'ip pim dense-mode' for the RP to work.
Why it's wrong here
Incorrect. PIM sparse-mode is required for RP-based multicast. Dense-mode does not use an RP.
- ✗
The RP address 10.0.0.1 must be configured on a loopback interface on the same router.
Why it's wrong here
Incorrect. The RP can be any reachable IP address, not necessarily on the same router.
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Last reviewed: Jul 4, 2026
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