- A
The BGP process is not configured to send traps to the SNMP agent; the command 'snmp-server enable traps bgp' is insufficient on some IOS versions without also enabling 'bgp snmp trap' under the BGP router configuration.
In some IOS versions, the SNMP agent needs explicit BGP notification enablement via 'bgp snmp trap' under the BGP router config. Without it, no BGP traps are generated.
- B
The NMS is using SNMPv3 but the router is configured for v2c, causing trap rejection.
Why wrong: The trap host is configured for v2c, and the NMS can poll, so version mismatch is not the issue. Traps would be sent regardless of polling.
- C
An ACL on the NMS is blocking UDP port 162 from the router.
Why wrong: This would cause traps to be sent but not received, but show snmp statistics shows TrapsSent: 0, meaning no traps are being generated.
- D
The router's SNMP trap queue is full, causing traps to be dropped.
Why wrong: show snmp pending shows no pending traps, so the queue is not full.
Quick Answer
The answer is that the BGP process itself must be explicitly configured to send notifications to the SNMP agent, as the global `snmp-server enable traps bgp` command alone is insufficient on many IOS versions. This is because BGP traps require a two-part activation: the SNMP agent must be told to listen for BGP events, and the BGP process must be told to generate those events via the `bgp snmp trap` command under the BGP router configuration mode. Without this, the BGP process never sends trap data to the SNMP agent, resulting in zero traps sent even though SNMP polling works fine. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of the separation between SNMP agent configuration and protocol-specific notification generation—a common pitfall where engineers assume the global trap enable covers all sub-protocols. Remember the memory tip: "Global enables the listener, BGP enables the speaker."
300-410 SNMP Troubleshooting Practice Question
This 300-410 practice question tests your understanding of snmp troubleshooting. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A network engineer configures SNMP traps on router R3 to monitor BGP events. R3 is an iBGP route reflector with multiple clients. The configuration includes: snmp-server enable traps bgp, snmp-server host 192.168.1.100 version 2c public. However, the NMS receives no BGP traps. R3's show snmp pending shows no pending traps. show snmp statistics shows TrapsSent: 0. The NMS can poll R3 successfully via SNMP. What is the root cause?
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 BGP process is not configured to send traps to the SNMP agent; the command 'snmp-server enable traps bgp' is insufficient on some IOS versions without also enabling 'bgp snmp trap' under the BGP router configuration.
SNMP traps for BGP require the BGP MIB to be loaded and the bgp trap sub-type to be enabled. The command 'snmp-server enable traps bgp' enables all BGP traps, but some platforms require additional configuration like 'snmp-server trap-source' to ensure the source IP is reachable. However, the NMS can poll, so reachability is fine. The issue is that the router's SNMP agent is not generating traps because the BGP process is not sending notifications due to a missing 'bgp snmp trap' configuration under the BGP address-family or the router's SNMP trap queue is full. But show snmp pending shows none, so queue is fine. The correct answer is: 'The BGP process is not configured to send traps to the SNMP agent; the command 'snmp-server enable traps bgp' is insufficient on some IOS versions without also enabling 'bgp snmp trap' under the BGP router configuration.'
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 BGP process is not configured to send traps to the SNMP agent; the command 'snmp-server enable traps bgp' is insufficient on some IOS versions without also enabling 'bgp snmp trap' under the BGP router configuration.
- ✗
The NMS is using SNMPv3 but the router is configured for v2c, causing trap rejection.
Why it's wrong here
The trap host is configured for v2c, and the NMS can poll, so version mismatch is not the issue. Traps would be sent regardless of polling.
- ✗
An ACL on the NMS is blocking UDP port 162 from the router.
Why it's wrong here
This would cause traps to be sent but not received, but show snmp statistics shows TrapsSent: 0, meaning no traps are being generated.
- ✗
The router's SNMP trap queue is full, causing traps to be dropped.
Why it's wrong here
show snmp pending shows no pending traps, so the queue is not full.
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
This would cause traps to be sent but not received, but show snmp statistics shows TrapsSent: 0, meaning no traps are being generated.
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 300-410 ACL questions on filtering logic and placement.
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FAQ
Questions learners often ask
What does this 300-410 question test?
SNMP Troubleshooting — This question tests SNMP Troubleshooting — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The BGP process is not configured to send traps to the SNMP agent; the command 'snmp-server enable traps bgp' is insufficient on some IOS versions without also enabling 'bgp snmp trap' under the BGP router configuration. — SNMP traps for BGP require the BGP MIB to be loaded and the bgp trap sub-type to be enabled. The command 'snmp-server enable traps bgp' enables all BGP traps, but some platforms require additional configuration like 'snmp-server trap-source' to ensure the source IP is reachable. However, the NMS can poll, so reachability is fine. The issue is that the router's SNMP agent is not generating traps because the BGP process is not sending notifications due to a missing 'bgp snmp trap' configuration under the BGP address-family or the router's SNMP trap queue is full. But show snmp pending shows none, so queue is fine. The correct answer is: 'The BGP process is not configured to send traps to the SNMP agent; the command 'snmp-server enable traps bgp' is insufficient on some IOS versions without also enabling 'bgp snmp trap' under the BGP router configuration.'
What should I do if I get this 300-410 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 300-410 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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