The best-supported conclusion is that the host is likely using DNS tunneling or DNS-based command and control. This is correct because the exhibit reveals a high volume of DNS queries to multiple unusual domains with long subdomain strings, a classic pattern where attackers encode data within DNS queries and responses to exfiltrate information or communicate with a C2 server while evading standard network filters. On the Security+ SY0-701 exam, this scenario tests your ability to distinguish anomalous DNS activity from normal web browsing, often appearing in performance-based questions with packet captures or logs. A common trap is mistaking this for a simple malware infection or benign DNS resolution, but the sheer volume and abnormal subdomain length are the giveaway. Remember the mnemonic “Long Queries Leak Data” to recall that extended, repetitive DNS queries to odd domains signal tunneling or C2.
SY0-701 Security Operations Practice Question
This SY0-701 practice question tests your understanding of security operations. 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.
Exhibit
DNS telemetry for host LAP-09:
10:14:02 query=TXT name=k7f3a9d1a.reporting-updates.net client=10.1.8.44
10:15:02 query=TXT name=m2b8c4.reporting-updates.net client=10.1.8.44
10:16:02 query=TXT name=q9z1x7.reporting-updates.net client=10.1.8.44
10:17:02 query=TXT name=t4n8p2.reporting-updates.net client=10.1.8.44
Packet summary: 58-byte UDP responses, repeated every 60 seconds
Proxy logs: no HTTP or HTTPS sessions to reporting-updates.net
EDR: python.exe launched by signed pdf reader, process exited in 3 seconds
EDR network telemetry: same pattern continued after the document closed
Based on the exhibit, what is the best-supported conclusion for the SOC analyst?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
DNS telemetry for host LAP-09:
10:14:02 query=TXT name=k7f3a9d1a.reporting-updates.net client=10.1.8.44
10:15:02 query=TXT name=m2b8c4.reporting-updates.net client=10.1.8.44
10:16:02 query=TXT name=q9z1x7.reporting-updates.net client=10.1.8.44
10:17:02 query=TXT name=t4n8p2.reporting-updates.net client=10.1.8.44
Packet summary: 58-byte UDP responses, repeated every 60 seconds
Proxy logs: no HTTP or HTTPS sessions to reporting-updates.net
EDR: python.exe launched by signed pdf reader, process exited in 3 seconds
EDR network telemetry: same pattern continued after the document closed
A
The traffic is normal web browsing to a content delivery network.
Why wrong: Normal browsing would usually include HTTP or HTTPS connections, not repeated TXT queries with no web sessions visible.
B
The host is likely using DNS tunneling or DNS-based command and control.
The repeated TXT queries, predictable timing, small UDP payloads, and absence of proxy traffic strongly suggest data or commands are being carried over DNS. The unique subdomains and steady beacon interval are classic indicators of DNS tunneling or DNS-based command-and-control. The signed PDF reader only shows how the activity may have started, not that it is benign.
C
The issue is most likely ARP spoofing on the local switch port.
Why wrong: ARP spoofing would affect Layer 2 traffic and gateway resolution, not create repeated TXT DNS requests with no corresponding HTTP sessions.
D
The evidence most strongly indicates a password spraying campaign.
Why wrong: Password spraying produces authentication failures across services. This exhibit shows DNS beacons, not login attempts or account lockouts.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The host is likely using DNS tunneling or DNS-based command and control.
The exhibit shows a high volume of DNS queries to multiple unusual domains with long subdomain strings, which is a classic indicator of DNS tunneling or DNS-based command and control (C2). DNS tunneling encodes data in DNS queries and responses, allowing attackers to exfiltrate data or communicate with a C2 server while bypassing traditional network controls. The SOC analyst should recognize this pattern as anomalous DNS activity rather than normal web browsing.
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.
✗
The traffic is normal web browsing to a content delivery network.
Why it's wrong here
Normal browsing would usually include HTTP or HTTPS connections, not repeated TXT queries with no web sessions visible.
✓
The host is likely using DNS tunneling or DNS-based command and control.
Why this is correct
The repeated TXT queries, predictable timing, small UDP payloads, and absence of proxy traffic strongly suggest data or commands are being carried over DNS. The unique subdomains and steady beacon interval are classic indicators of DNS tunneling or DNS-based command-and-control. The signed PDF reader only shows how the activity may have started, not that it is benign.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The issue is most likely ARP spoofing on the local switch port.
Why it's wrong here
ARP spoofing would affect Layer 2 traffic and gateway resolution, not create repeated TXT DNS requests with no corresponding HTTP sessions.
✗
The evidence most strongly indicates a password spraying campaign.
Why it's wrong here
Password spraying produces authentication failures across services. This exhibit shows DNS beacons, not login attempts or account lockouts.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse DNS tunneling with normal DNS resolution for CDN services, but the key differentiator is the abnormal volume and structure of the DNS queries, not the destination IP addresses.
Trap categories for this question
Command / output trap
Password spraying produces authentication failures across services. This exhibit shows DNS beacons, not login attempts or account lockouts.
Detailed technical explanation
How to think about this question
DNS tunneling exploits the DNS protocol by encoding data in the subdomain labels of DNS queries, often using base64 or similar encoding, and then exfiltrating it to an attacker-controlled authoritative DNS server. Tools like dnscat2 or Iodine can create a bidirectional tunnel over UDP port 53, bypassing firewalls that allow DNS traffic. In a real-world scenario, an infected host might generate thousands of DNS queries per minute to domains like 'exfil.attacker.com' with subdomains containing stolen data, making it detectable by analyzing query volume and entropy.
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 SOC analyst notices unusual lateral movement in the network at 2 AM. The IR playbook dictates: identify and contain (isolate the affected machine), then eradicate (remove the malware), then recover (restore from backup), then document. Skipping containment before eradication risks the attacker regaining access. Questions like this test the sequence and rationale of incident response phases.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SY0-701 question in full detail.
Security Operations — This question tests Security Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The host is likely using DNS tunneling or DNS-based command and control. — The exhibit shows a high volume of DNS queries to multiple unusual domains with long subdomain strings, which is a classic indicator of DNS tunneling or DNS-based command and control (C2). DNS tunneling encodes data in DNS queries and responses, allowing attackers to exfiltrate data or communicate with a C2 server while bypassing traditional network controls. The SOC analyst should recognize this pattern as anomalous DNS activity rather than normal web browsing.
What should I do if I get this SY0-701 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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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