The correct response is to isolate the workstation to stop possible lateral movement. This is because the SIEM alert shows a single system rapidly connecting to many internal hosts over SMB and then targeting administrative shares like ADMIN$ or C$, which are classic indicators of lateral movement often used by ransomware or worm-like malware to spread across a network. On the Security+ SY0-701 exam, this scenario tests your understanding of containment as the immediate priority over investigation or patching, since stopping the spread is critical to limiting damage. A common trap is choosing to disable SMB or delete the shares, but those steps are secondary to isolating the compromised host. Remember the mnemonic “SMB Spreads, So Isolate First” to lock in the priority.
SY0-701 Threats, Vulnerabilities, and Mitigations Practice Question
This SY0-701 practice question tests your understanding of threats, vulnerabilities, and mitigations. 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.
A SIEM alert shows one workstation connecting to many internal systems over SMB in a short period of time, followed by attempts to access administrative shares. What is the best response?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Isolate the workstation to stop possible lateral movement
Option B is correct because the SIEM alert describes classic indicators of lateral movement using SMB, often associated with ransomware or worm-like malware. Isolating the workstation immediately stops the attacker from spreading to other systems via administrative shares (e.g., ADMIN$, C$), which are commonly abused for remote execution. This containment step is the highest priority before any forensic analysis.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Ignore the alert because SMB is a normal file-sharing protocol
Why it's wrong here
Normal SMB use does not explain rapid scanning of many hosts and repeated access to administrative shares.
✓
Isolate the workstation to stop possible lateral movement
Why this is correct
Rapid SMB connections to multiple hosts are a strong sign of spread or lateral movement, so isolation is the safest immediate action.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the workstation's monitor brightness to help the user notice alerts
Why it's wrong here
This has no effect on the suspicious network activity or containment of the possible incident.
✗
Disable all SMB traffic across the entire company immediately
Why it's wrong here
That is an overly broad response and could interrupt normal business operations before confirming the scope of the issue.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may dismiss the alert as normal SMB traffic (Option A) because SMB is common, failing to recognize that the combination of rapid connections and administrative share access is a textbook lateral movement indicator.
Detailed technical explanation
How to think about this question
Under the hood, SMB lateral movement often leverages PsExec or WMI to execute commands remotely via administrative shares (ADMIN$, C$). The rapid connection pattern may indicate an attacker using tools like CrackMapExec to enumerate and compromise hosts. In real-world incidents, such as the NotPetya outbreak, SMB-based worm propagation caused massive damage, making rapid isolation of the first infected host critical to preventing a full-scale breach.
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.
Threats, Vulnerabilities, and Mitigations — This question tests Threats, Vulnerabilities, and Mitigations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Isolate the workstation to stop possible lateral movement — Option B is correct because the SIEM alert describes classic indicators of lateral movement using SMB, often associated with ransomware or worm-like malware. Isolating the workstation immediately stops the attacker from spreading to other systems via administrative shares (e.g., ADMIN$, C$), which are commonly abused for remote execution. This containment step is the highest priority before any forensic analysis.
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.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. SIEM alerts show one workstation making SMB connections to 30 internal hosts within 10 minutes, followed by remote service creation and repeated access attempts to admin shares. The workstation also begins authenticating with several privileged accounts. What is the most likely activity?
medium
A.A distributed denial-of-service attack launched from a compromised internal host.
B.DNS tunneling used to exfiltrate data through allowed name-resolution traffic.
C.ARP spoofing to redirect local traffic at the network layer.
✓ D.Lateral movement after credential compromise or endpoint takeover.
Why D: The sequence of SMB connections to many internal hosts, followed by remote service creation and repeated access attempts to admin shares, combined with authentication using privileged accounts, is the classic pattern of lateral movement. This indicates the attacker has already compromised the workstation (endpoint takeover) or obtained valid credentials and is now using SMB and PsExec-like techniques to move laterally across the network, escalate privileges, and establish persistence.
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This SY0-701 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SY0-701 exam.
Question Discussion
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