The correct statement is that the ERSPAN destination session receives traffic from source IP 10.0.0.2 and sends it to Gi0/1. This is correct because an ERSPAN destination session is configured to accept encapsulated mirrored traffic from a specified source IP—here, 10.0.0.2—using a unique ERSPAN ID of 100, then decapsulates that traffic and forwards the original frames out the designated destination port, Gi0/1, in native encapsulation. On the Cisco CCNP ENARSI 300-410 exam, interpreting ERSPAN session output tests your ability to distinguish between source and destination roles, as well as to read key fields like Source IP, Destination Ports, and ERSPAN ID. A common trap is confusing the source IP in a destination session with a source session’s monitor source; remember that in a destination session, the “Source IP” is where the encapsulated traffic arrives from, not where the original traffic originated. Memory tip: “Destination decaps—source IP is the sender, Gi0/1 is the receiver.”
300-410 SPAN, RSPAN, and ERSPAN Practice Question
This 300-410 practice question tests your understanding of span, rspan, and erspan. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 runs the following command on router R3:
R3# show monitor session 5
Session 5
---------
Type : ERSPAN Destination Session
Status : Admin Enabled
Source IP : 10.0.0.2
Destination Ports : Gi0/1
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The ERSPAN destination session receives traffic from source IP 10.0.0.2 and sends it to Gi0/1.
This is an ERSPAN destination session. It receives ERSPAN-encapsulated traffic from source IP 10.0.0.2 with ERSPAN ID 100, decapsulates it, and sends the original mirrored traffic to destination port Gi0/1. The session is administratively enabled.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 ERSPAN destination session receives traffic from source IP 10.0.0.2 and sends it to Gi0/1.
Why this is correct
The output shows source IP 10.0.0.2, destination port Gi0/1, and ERSPAN ID 100, confirming this.
Related concept
Static NAT maps one inside address to one outside address.
✗
The ERSPAN destination session sends traffic to source IP 10.0.0.2.
Why it's wrong here
The source IP is where traffic comes from, not where it is sent.
✗
The session is an RSPAN destination session because it uses a destination port.
Why it's wrong here
The type is 'ERSPAN Destination Session', not RSPAN.
✗
The session is misconfigured because the destination port has ingress disabled.
Why it's wrong here
Ingress disabled is normal for SPAN destination ports.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
SPAN, RSPAN, and ERSPAN — This question tests SPAN, RSPAN, and ERSPAN — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The ERSPAN destination session receives traffic from source IP 10.0.0.2 and sends it to Gi0/1. — This is an ERSPAN destination session. It receives ERSPAN-encapsulated traffic from source IP 10.0.0.2 with ERSPAN ID 100, decapsulates it, and sends the original mirrored traffic to destination port Gi0/1. The session is administratively enabled.
What should I do if I get this 300-410 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A network engineer runs the following command on router R4:
R4# show monitor session 9
Session 9
---------
Type : ERSPAN Source Session
Status : Admin Disabled
Source Ports :
Both : Gi0/2
Destination IP : 192.168.2.20
Origin IP : 10.0.0.3
ERSPAN ID : 200
Based on this output, which statement is correct?
medium
✓ A.The ERSPAN session is configured but not currently active because it is administratively disabled.
B.The ERSPAN session is actively mirroring traffic from Gi0/2 to 192.168.2.20.
C.The ERSPAN session is using RSPAN because the status is disabled.
D.The ERSPAN session is misconfigured because the origin IP is missing.
Why A: This is an ERSPAN source session that is administratively disabled. The configuration is present but not active. To enable it, the engineer must use the 'no shutdown' command under the session configuration.
Variation 2. A network engineer runs the following command on router R2:
R2# show monitor session 4
Session 4
---------
Type : ERSPAN Source Session
Status : Admin Enabled
Source Ports :
Both : Gi0/0
Destination IP : 192.168.1.10
Origin IP : 10.0.0.2
ERSPAN ID : 100
Based on this output, which statement is correct?
medium
✓ A.The ERSPAN session is mirroring traffic from Gi0/0 to IP address 192.168.1.10 using ERSPAN ID 100.
B.The ERSPAN session is mirroring traffic from IP 192.168.1.10 to Gi0/0.
C.The ERSPAN session is using RSPAN encapsulation.
D.The ERSPAN session is disabled because the status is 'Admin Enabled'.
Why A: This is an ERSPAN source session. It mirrors traffic from source port Gi0/0 and encapsulates it with an ERSPAN header, sending it to destination IP 192.168.1.10 with origin IP 10.0.0.2 and ERSPAN ID 100. The session is administratively enabled.
Last reviewed: Jun 19, 2026
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