Question 665 of 1,000

Security Monitoring →hardMultiple ChoiceObjective-mapped

200-201 Security Monitoring Practice Question

This 200-201 practice question tests your understanding of security monitoring. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.

During a security incident, a SOC analyst reviews NetFlow records and notices a single internal host communicating with a remote server on TCP port 443, sending 50 MB of data in 5 minutes, while the usual baseline for that host is 1 MB per hour. Which type of activity is most likely indicated?

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.

A
Denial of service attack
Why wrong: DoS attacks generate high traffic but typically to many destinations or with specific patterns, not a single external IP with large data uploads.
B
Port scan activity
Why wrong: Port scans involve connections to many ports on many hosts, not large data transfers.
C
Data exfiltration
Unusually high outbound data volume, especially to a single external IP, is a strong indicator of data theft.
D
Normal web browsing traffic
Why wrong: The volume is far above the host's baseline; normal browsing would not produce such a spike.

Full breakdown with real-world context →

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

✓

Data exfiltration

The sudden spike in outbound data volume from a single internal host to a remote server over TCP port 443 (HTTPS) far exceeds the established baseline of 1 MB per hour, reaching 50 MB in just 5 minutes. This anomalous behavior is a classic indicator of data exfiltration, where an attacker is using encrypted HTTPS traffic to stealthily transfer stolen data out of the network without triggering typical signature-based alerts.

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.

✗
Denial of service attack
Why it's wrong here
DoS attacks generate high traffic but typically to many destinations or with specific patterns, not a single external IP with large data uploads.
✗
Port scan activity
Why it's wrong here
Port scans involve connections to many ports on many hosts, not large data transfers.
✓
Data exfiltration
Why this is correct
Unusually high outbound data volume, especially to a single external IP, is a strong indicator of data theft.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Normal web browsing traffic
Why it's wrong here
The volume is far above the host's baseline; normal browsing would not produce such a spike.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Cisco often tests the distinction between volumetric anomalies (like data exfiltration) and behavioral anomalies (like scans or DoS), and the trap here is that candidates may confuse a high outbound data volume with a DoS attack, forgetting that DoS targets inbound traffic to a victim, not outbound bulk transfer from a single host.

Detailed technical explanation

How to think about this question

NetFlow records capture metadata such as source/destination IPs, ports, protocol, and byte counts, but not the payload content. In this scenario, the use of TCP port 443 (HTTPS) means the traffic is encrypted, so the SOC analyst cannot inspect the payload directly; the anomaly is purely volumetric. Real-world exfiltration often leverages HTTPS to blend in with legitimate traffic, making baseline deviation analysis (e.g., using tools like Zeek or Cisco Stealthwatch) critical for detection.

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 practitioner preparing for the 200-201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.

Quick reference

Common DNS Record Types

Record	Purpose	Example
A	IPv4 address mapping	example.com → 93.184.216.34
AAAA	IPv6 address mapping	example.com → 2606:2800::1
CNAME	Alias to another hostname	www → example.com
MX	Mail server for domain	example.com → mail.example.com (priority 10)
TXT	Text data (SPF, DKIM, verification)	v=spf1 include:_spf.example.com ~all
NS	Authoritative name servers	example.com NS ns1.example.com
PTR	Reverse DNS (IP → hostname)	34.216.184.93.in-addr.arpa → example.com
SOA	Zone authority record	Primary NS, admin email, serial, TTL defaults

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.

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FAQ

Questions learners often ask

What does this 200-201 question test?

Security Monitoring — This question tests Security Monitoring — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Data exfiltration — The sudden spike in outbound data volume from a single internal host to a remote server over TCP port 443 (HTTPS) far exceeds the established baseline of 1 MB per hour, reaching 50 MB in just 5 minutes. This anomalous behavior is a classic indicator of data exfiltration, where an attacker is using encrypted HTTPS traffic to stealthily transfer stolen data out of the network without triggering typical signature-based alerts.

What should I do if I get this 200-201 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jul 4, 2026

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