The answer is that the new switch's WWN is not included in the fabric binding configuration. Fabric binding enforces a strict access control list based on the switch’s World Wide Name (WWN), and if the WWN of the newly added switch is missing from that allowed list, the E-port will fail to initialize and remain in a non-operational state. On the Cisco DCCOR 350-601 exam, this scenario tests your understanding of how fabric binding differs from zoning—zoning controls device communication within a fabric, while fabric binding controls which switches can even join the fabric at the E-port level. A common trap is confusing fabric binding with SFP compatibility or switch priority; remember that incompatible SFPs cause link-level errors, not a specific E-port failure tied to a WWN mismatch. Memory tip: "Binding blocks the box, zoning blocks the host"—if the E-port won’t come up, check the switch WWN in the binding list first.
350-601 Storage Network Practice Question
This 350-601 practice question tests your understanding of storage network. 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 Cisco MDS switch is configured with fabric binding to restrict which switches can join the fabric. A new switch is added, but it fails to establish an E-port connection. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The new switch's WWN is not included in the fabric binding configuration
Option B is correct: Fabric binding uses the switch WWN to allow or deny switches. If the new switch's WWN is not in the allowed list, the E-port will not come up. Option A is wrong: Incompatible SFP would cause link issues regardless of fabric binding. Option C is wrong: Zoning does not affect E-port formation. Option D is wrong: Switch priority affects principal switch selection, not E-port formation.
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.
✗
Incompatible SFP modules between the switches
Why it's wrong here
Link would not come up at all, not just E-port failure.
✗
Incorrect zoning configuration on the existing switch
Why it's wrong here
Zoning does not affect E-port operations.
✗
The new switch has a higher priority than the principal switch
Why it's wrong here
Priority affects principal selection, not E-port establishment.
✓
The new switch's WWN is not included in the fabric binding configuration
Why this is correct
Fabric binding rejects unauthorized switches.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
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 350-601 NAT questions on configuration and troubleshooting.
Storage Network — This question tests Storage Network — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The new switch's WWN is not included in the fabric binding configuration — Option B is correct: Fabric binding uses the switch WWN to allow or deny switches. If the new switch's WWN is not in the allowed list, the E-port will not come up. Option A is wrong: Incompatible SFP would cause link issues regardless of fabric binding. Option C is wrong: Zoning does not affect E-port formation. Option D is wrong: Switch priority affects principal switch selection, not E-port formation.
What should I do if I get this 350-601 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 350-601 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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