- A
The router will act as both a candidate RP for groups 239.0.0.0/8 and a mapping agent for Auto-RP within a scope of 10 hops.
Correct. The router is configured as both a candidate RP and a mapping agent, with a TTL scope of 10.
- B
The router will only act as a mapping agent and will not advertise itself as an RP.
Why wrong: Incorrect. The 'send-rp-announce' command makes it a candidate RP as well.
- C
The router will use the IP address of GigabitEthernet0/0 as the RP address.
Why wrong: Incorrect. The RP address is taken from the interface specified in the 'send-rp-announce' command, which is Loopback0.
- D
The router will only accept RP announcements from other routers within 10 hops.
Why wrong: Incorrect. The scope limits the TTL of the announcements sent, not the acceptance of announcements.
Quick Answer
The answer is that the router will act as both a candidate RP for groups 239.0.0.0/8 and a mapping agent for Auto-RP within a scope of 10 hops. This is correct because the `ip pim send-rp-announce` command designates the router as a candidate RP, using the Loopback0 IP as the RP address and restricting group coverage to those permitted by access-list 10, while the `ip pim send-rp-discovery` command enables the mapping agent role, which collects these announcements and disseminates the RP-to-group mappings to other routers. On the ENCOR 350-401 exam, this configuration tests your understanding of Auto-RP’s dual roles and the importance of the scope value, which limits propagation via TTL; a common trap is confusing the candidate RP with the mapping agent or forgetting that the mapping agent does not need to be a candidate RP itself. Remember the mnemonic: “Announce to be a candidate, Discover to map the group.”
CCNP IP Multicast Practice Question
This 350-401 practice question tests your understanding of ip multicast. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Examine the following configuration snippet:
ip pim send-rp-announce Loopback0 scope 10 group-list 10 ip pim send-rp-discovery scope 10 access-list 10 permit 239.0.0.0 0.255.255.255
!
interface Loopback0 ip address 192.168.0.1 255.255.255.255 ip pim sparse-mode
!
What is the purpose of this configuration?
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 act as both a candidate RP for groups 239.0.0.0/8 and a mapping agent for Auto-RP within a scope of 10 hops.
This configures the router as an Auto-RP mapping agent and candidate RP. The 'send-rp-announce' command advertises this router as a candidate RP for groups matching ACL 10 (239.0.0.0/8) with a TTL scope of 10. The 'send-rp-discovery' command makes the router act as a mapping agent, listening for RP announcements and sending RP-discovery messages. The loopback interface is used as the RP address.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 act as both a candidate RP for groups 239.0.0.0/8 and a mapping agent for Auto-RP within a scope of 10 hops.
Why this is correct
Correct. The router is configured as both a candidate RP and a mapping agent, with a TTL scope of 10.
Related concept
Standard ACLs match source addresses.
- ✗
The router will only act as a mapping agent and will not advertise itself as an RP.
Why it's wrong here
Incorrect. The 'send-rp-announce' command makes it a candidate RP as well.
- ✗
The router will use the IP address of GigabitEthernet0/0 as the RP address.
Why it's wrong here
Incorrect. The RP address is taken from the interface specified in the 'send-rp-announce' command, which is Loopback0.
- ✗
The router will only accept RP announcements from other routers within 10 hops.
Why it's wrong here
Incorrect. The scope limits the TTL of the announcements sent, not the acceptance of announcements.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Trap categories for this question
Command / output trap
Incorrect. The 'send-rp-announce' command makes it a candidate RP as well.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 350-401 ACL questions on filtering logic and placement.
- →
IP Multicast — study guide chapter
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FAQ
Questions learners often ask
What does this 350-401 question test?
IP Multicast — This question tests IP Multicast — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The router will act as both a candidate RP for groups 239.0.0.0/8 and a mapping agent for Auto-RP within a scope of 10 hops. — This configures the router as an Auto-RP mapping agent and candidate RP. The 'send-rp-announce' command advertises this router as a candidate RP for groups matching ACL 10 (239.0.0.0/8) with a TTL scope of 10. The 'send-rp-discovery' command makes the router act as a mapping agent, listening for RP announcements and sending RP-discovery messages. The loopback interface is used as the RP address.
What should I do if I get this 350-401 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 350-401 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 18, 2026
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