- A
The destination session must be configured with 'monitor session <session> type erspan-destination'.
Correct. The 'type erspan-destination' keyword is required to define the session as an ERSPAN destination.
- B
The source of the destination session must specify the 'erspan-id' and the source IP address of the ERSPAN tunnel.
Correct. Under 'monitor session <session> type erspan-destination', the 'source' subcommand requires 'erspan-id <id>' and 'ip address <source-ip>' (the IP of the source switch).
- C
The destination session can have multiple destination interfaces to send the decapsulated traffic to multiple analyzers.
Why wrong: Incorrect. Like local SPAN, an ERSPAN destination session can have only one destination interface.
- D
The destination session automatically creates a GRE tunnel interface that appears in 'show ip interface brief'.
Why wrong: Incorrect. No tunnel interface is created; the decapsulation is handled internally by the monitor session.
- E
The destination session must be in the same VRF as the source session's destination IP to ensure reachability.
Why wrong: Incorrect. The destination session does not use VRF; the ERSPAN traffic arrives at the switch's global routing table unless a specific VRF is configured on the incoming interface.
300-410 SPAN, RSPAN, and ERSPAN Practice Question
This 300-410 practice question tests your understanding of span, rspan, and erspan. 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.
Which TWO statements about the configuration of an ERSPAN destination session are correct? (Choose TWO.)
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 destination session must be configured with 'monitor session <session> type erspan-destination'.
The ERSPAN destination session decapsulates GRE-encapsulated traffic and sends it to a local port. It must be configured with 'type erspan-destination', the source must specify the ERSPAN ID and the source IP address (the same as the destination IP of the source session), and the destination is a local interface. The session must be in the same VRF as the incoming ERSPAN traffic.
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 destination session must be configured with 'monitor session <session> type erspan-destination'.
Why this is correct
Correct. The 'type erspan-destination' keyword is required to define the session as an ERSPAN destination.
Related concept
Static NAT maps one inside address to one outside address.
- ✓
The source of the destination session must specify the 'erspan-id' and the source IP address of the ERSPAN tunnel.
Why this is correct
Correct. Under 'monitor session <session> type erspan-destination', the 'source' subcommand requires 'erspan-id <id>' and 'ip address <source-ip>' (the IP of the source switch).
Related concept
Static NAT maps one inside address to one outside address.
- ✗
The destination session can have multiple destination interfaces to send the decapsulated traffic to multiple analyzers.
Why it's wrong here
Incorrect. Like local SPAN, an ERSPAN destination session can have only one destination interface.
- ✗
The destination session automatically creates a GRE tunnel interface that appears in 'show ip interface brief'.
Why it's wrong here
Incorrect. No tunnel interface is created; the decapsulation is handled internally by the monitor session.
- ✗
The destination session must be in the same VRF as the source session's destination IP to ensure reachability.
Why it's wrong here
Incorrect. The destination session does not use VRF; the ERSPAN traffic arrives at the switch's global routing table unless a specific VRF is configured on the incoming interface.
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.
What to study next
Got this wrong? Here's your next step.
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.
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SPAN, RSPAN, and ERSPAN — study guide chapter
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FAQ
Questions learners often ask
What does this 300-410 question test?
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 destination session must be configured with 'monitor session <session> type erspan-destination'. — The ERSPAN destination session decapsulates GRE-encapsulated traffic and sends it to a local port. It must be configured with 'type erspan-destination', the source must specify the ERSPAN ID and the source IP address (the same as the destination IP of the source session), and the destination is a local interface. The session must be in the same VRF as the incoming ERSPAN traffic.
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.
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Last reviewed: Jun 19, 2026
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