20+ practice questions focused on SPAN, RSPAN, and ERSPAN — one of the most tested topics on the Cisco CCNP ENARSI 300-410 exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start SPAN, RSPAN, and ERSPAN PracticeA network engineer configures SPAN on a Cisco Catalyst switch to monitor traffic between two hosts. The engineer configures the source interface as GigabitEthernet0/1 and the destination interface as GigabitEthernet0/2. After the configuration, the engineer notices that the monitored traffic is not being forwarded to the destination port. What is the most likely cause?
Explanation: SPAN destination ports must be configured with the 'spanning-tree portfast' command to avoid being blocked by Spanning Tree Protocol (STP). Without this, the destination port may remain in a blocking state.
An engineer configures RSPAN on a Cisco switch to monitor traffic from VLAN 10 across multiple switches. The engineer creates an RSPAN VLAN (VLAN 100) on the source switch and configures the source as VLAN 10. On the remote switch, the engineer configures the destination port as GigabitEthernet0/1 in VLAN 100. However, the destination port does not forward any monitored traffic. What is the most likely cause?
Explanation: RSPAN requires that the RSPAN VLAN be allowed on all trunk links between the source and destination switches. If the RSPAN VLAN is not allowed on the trunk, the traffic will not reach the destination.
A network engineer is troubleshooting an ERSPAN configuration where traffic from a source router is being sent to a remote monitoring server. The engineer configures an ERSPAN source session on Router A to capture traffic on GigabitEthernet0/0 and send it to the IP address 10.1.1.100. The monitoring server does not receive any packets. The engineer verifies that IP connectivity exists between Router A and the server. What is the most likely cause?
Explanation: ERSPAN requires a tunnel interface to encapsulate the monitored traffic. Without configuring a tunnel interface, the ERSPAN session cannot encapsulate the packets for transport to the remote destination.
An engineer configures a local SPAN session on a Cisco switch to monitor all traffic on VLAN 20. The engineer uses the command 'monitor session 1 source vlan 20' and 'monitor session 1 destination interface GigabitEthernet0/3'. The engineer connects a laptop to GigabitEthernet0/3 and runs a packet capture, but sees only traffic from the switch itself, not from other devices in VLAN 20. What is the most likely cause?
Explanation: By default, SPAN monitors only ingress traffic on the source VLAN. To capture both directions, the command must specify 'both' for the source. The default is 'rx' only.
A network engineer configures an RSPAN session on Switch A to monitor traffic from interface GigabitEthernet0/1 and sends it to Switch B. The engineer creates RSPAN VLAN 50 on both switches and configures the trunk between them to allow VLAN 50. On Switch B, the engineer configures the destination port as GigabitEthernet0/2 in VLAN 50. The engineer notices that the destination port is not forwarding any traffic. What should the engineer check first?
Explanation: RSPAN requires that the RSPAN VLAN be configured with the 'remote-span' command on all switches that participate. Without this, the VLAN may not be treated as an RSPAN VLAN and traffic may not be forwarded correctly.
+15 more SPAN, RSPAN, and ERSPAN questions available
Practice all SPAN, RSPAN, and ERSPAN questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of SPAN, RSPAN, and ERSPAN. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
SPAN, RSPAN, and ERSPAN questions on the 300-410 frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. SPAN, RSPAN, and ERSPAN is tested as part of the Cisco CCNP ENARSI 300-410 blueprint. Practicing with targeted SPAN, RSPAN, and ERSPAN questions ensures you can handle any format or difficulty that appears.
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Difficulty is subjective, but SPAN, RSPAN, and ERSPAN is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
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