The answer is the same Message-ID appearing multiple times in the mail logs with different mid values. This is correct because a mail loop on a Cisco ESA causes the same message to be re-injected into the system repeatedly, with each iteration generating a new mail ID (mid) while the original Message-ID header remains unchanged, resulting in duplicate Message-IDs across distinct log entries. Additionally, a high number of messages accumulating in the 'Bounced' queue is a classic symptom, as the loop eventually exceeds hop count limits, forcing the ESA to permanently fail the delivery and move those messages to the Bounced queue. On the Cisco SCOR 350-701 exam, this topic tests your ability to diagnose mail flow anomalies by analyzing mail logs and queue states; a common trap is confusing the Bounced queue with the Delayed queue, but remember that loops produce permanent failures, not temporary deferrals. Memory tip: "Same ID, different mid, bounced to the bin" — if you see the same Message-ID with varying mids and a swelling Bounced queue, you have a loop.
350-701 Content Security Practice Question
This 350-701 practice question tests your understanding of content security. 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.
Which THREE symptoms indicate that a Cisco ESA is experiencing a mail loop?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A high number of messages in the 'Bounced' queue.
A high number of messages in the 'Bounced' queue is a classic symptom of a mail loop on a Cisco ESA. When a loop occurs, messages are repeatedly sent back and forth between mail servers, eventually exceeding the maximum hop count or delivery attempts, causing them to be moved to the Bounced queue. This queue specifically holds messages that could not be delivered due to permanent failures, and loops generate many such failures.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
A high number of messages in the 'Bounced' queue.
Why this is correct
Loops often cause bounce messages to accumulate.
Related concept
Read the scenario before looking for a memorised answer.
✗
Messages fail DKIM signature verification.
Why it's wrong here
DKIM failure may indicate modification, but not necessarily a loop.
✓
Multiple 'Received:' headers from the same ESA in the same message.
Why this is correct
Indicates the message passed through the same server multiple times.
Related concept
Read the scenario before looking for a memorised answer.
✗
A rapid increase in the 'Spam Quarantine' count.
Why it's wrong here
Spam quarantine is for detected spam, not loops.
✓
The same Message-ID appears multiple times in the mail logs with different mid values.
Why this is correct
Each pass through the ESA generates a new message ID (mid).
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between symptoms of a mail loop (bounced queue, duplicate Received headers, repeated Message-IDs) and symptoms of other issues like spam or authentication failures, so candidates mistakenly associate DKIM failures or quarantine increases with loops.
Detailed technical explanation
How to think about this question
Under the hood, a mail loop occurs when two or more mail servers (or the same server) forward a message back and forth without end, often due to misconfigured aliases or forwarding rules. The Cisco ESA tracks this via the 'Received:' header count and the Message-ID in mail logs; the same Message-ID with different mid values indicates the same message being processed multiple times as it re-enters the system. The Bounced queue accumulates messages when the hop count (default 25 in RFC 5321) is exceeded, triggering a permanent failure.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Content Security — This question tests Content Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A high number of messages in the 'Bounced' queue. — A high number of messages in the 'Bounced' queue is a classic symptom of a mail loop on a Cisco ESA. When a loop occurs, messages are repeatedly sent back and forth between mail servers, eventually exceeding the maximum hop count or delivery attempts, causing them to be moved to the Bounced queue. This queue specifically holds messages that could not be delivered due to permanent failures, and loops generate many such failures.
What should I do if I get this 350-701 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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