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AP Cybersecurity Unit 3 practice questions

Try 10 multiple-choice questions from Unit 3 here. Pick an answer to see why it's right or wrong, then take the timed test above for a full AP-style set.

  1. Question 1

    === ARP Cache Snapshot — Core Switch SW-01 === $ arp -a

    Timestamp: 2024-11-14 09:17:43

    IP Address MAC Address Interface Age(s) Type

    192.168.10.1 aa:bb:cc:11:22:33 Gi0/1 12 DYNAMIC (Default Gateway) 192.168.10.20 00:1A:2B:3C:4D:5E Gi0/4 45 DYNAMIC (Workstation: WKSTN-SALES) 192.168.10.35 00:9F:7E:6D:5C:4B Gi0/7 60 DYNAMIC (Workstation: WKSTN-HR) 192.168.10.50 de:ad:be:ef:00:01 Gi0/12 3 DYNAMIC (Workstation: WKSTN-ACCT) 192.168.10.100 de:ad:be:ef:00:01 Gi0/12 3 DYNAMIC (Server: FILE-SRV-01)

    === Switch Port MAC Address Table — SW-01 === $ show mac address-table

    Line VLAN MAC Address Type Port

    01 10 aa:bb:cc:11:22:33 STATIC Gi0/1 02 10 00:1A:2B:3C:4D:5E DYNAMIC Gi0/4 03 10 00:9F:7E:6D:5C:4B DYNAMIC Gi0/7 04 10 de:ad:be:ef:00:01 DYNAMIC Gi0/12

    === Syslog — SW-01 Anomalous ARP Events ===

    Line Timestamp Severity Message

    01 2024-11-14 09:14:02 WARNING Gratuitous ARP received on Gi0/12: IP 192.168.10.50 → MAC de:ad:be:ef:00:01 02 2024-11-14 09:14:03 WARNING Gratuitous ARP received on Gi0/12: IP 192.168.10.100 → MAC de:ad:be:ef:00:01 03 2024-11-14 09:14:03 WARNING ARP reply rate exceeded threshold on Gi0/12 (87 replies/sec) 04 2024-11-14 09:14:05 INFO ARP cache updated: 192.168.10.50 now maps to de:ad:be:ef:00:01 05 2024-11-14 09:14:05 INFO ARP cache updated: 192.168.10.100 now maps to de:ad:be:ef:00:01 06 2024-11-14 09:15:11 INFO Traffic destined for 192.168.10.100 (FILE-SRV-01) forwarded to Gi0/12 07 2024-11-14 09:15:12 INFO Traffic destined for 192.168.10.50 (WKSTN-ACCT) forwarded to Gi0/12 08 2024-11-14 09:16:30 INFO Outbound session observed: Gi0/12 → 203.0.113.47:443 (external) 09 2024-11-14 09:17:01 WARNING Duplicate IP detected: 192.168.10.100 claimed by two MAC addresses 10 2024-11-14 09:17:43 CRITICAL Dynamic ARP Inspection (DAI) not configured on VLAN 10

    NOTE: Prior recorded MAC for 192.168.10.100 (FILE-SRV-01) was 00:FF:AA:BB:CC:12 (Gi0/9). NOTE: Prior recorded MAC for 192.168.10.50 (WKSTN-ACCT) was 00:3E:1A:9C:77:D4 (Gi0/5).

    Based on the correlation of the ARP cache snapshot and the syslog events between 09:14:02 and 09:16:30, which of the following best classifies the adversary's primary objective?

    Establishing a man-in-the-middle position to intercept and exfiltrate data.

    Executing a denial-of-service attack against the network switch.

    Bypassing port security controls by cloning an authorized MAC address.

    Exploiting an operating system vulnerability on the internal file server.

    Show answer

    Answer: (A)

    The combination of gratuitous ARP messages, updated cache mappings redirecting traffic to a single port (Gi0/12), and a subsequent outbound external connection strongly indicates a Man-in-the-Middle attack designed for data exfiltration, rather than a DoS or endpoint OS exploit.

  2. Question 2

    A university's security team is designing a new protection strategy after an audit revealed that a single compromised faculty account allowed an attacker to move laterally across the network and reach the student records database. The team wants to ensure that future lateral movement is detected and stopped before sensitive data is reached. Which combination of defense-in-depth layers would most directly address both detection and containment of lateral movement?

    Network segmentation to contain lateral movement combined with an intrusion detection system to identify unusual account activity

    Physical perimeter locks on server rooms combined with security cameras to monitor unauthorized physical entry attempts

    A password policy requiring complexity combined with annual security awareness training for all faculty members

    Cyber insurance transference policy combined with a documented incident response plan for post-breach recovery

    Show answer

    Answer: (A)

    Applying both a network-layer control (segmentation limits how far an attacker can move between systems) and a detective control (an intrusion detection system flags anomalous behavior) directly addresses the two goals: containment and detection. This combination reflects defense-in-depth by using controls from different layers that complement each other against the specific threat of lateral movement.

  3. Question 3

    A nation-state group discovers a previously unknown flaw in widely used industrial control software and writes a custom exploit to target power grid operators. No patch exists because the vendor is unaware of the vulnerability. Which adversary classification fits this group, and which layered control is most relevant given that patching is not yet possible?

    A high-skilled adversary exploiting a zero day; network segmentation limits lateral movement until a patch is released

    A low-skilled adversary exploiting a known flaw; network segmentation limits lateral movement until a patch is released

    A high-skilled adversary exploiting a zero day; immediate patch deployment eliminates the vulnerability before damage occurs

    A high-skilled adversary exploiting a zero day; SSID verification training prevents employees from connecting to rogue networks

    Show answer

    Answer: (A)

    Discovering an undocumented vulnerability and writing a custom exploit are defining characteristics of a high-skilled adversary. Because no patch exists, patch management cannot help; network segmentation is a compensating control that restricts how far an attacker can move through the environment while the vendor develops a fix.

  4. Question 4

    During a security assessment of a hospital campus, a technician discovers that an adversary has been broadcasting a powerful electromagnetic signal on the 2.4 GHz frequency band, completely preventing wireless communication between nurses' tablets and the access points. Which type of wireless attack is occurring, and which layered control best addresses it?

    A jamming attack; deploying wired network connections as a redundant backup for critical systems

    An evil twin attack; deploying wired network connections as a redundant backup for critical systems

    A jamming attack; enforcing HTTPS on all tablet applications to encrypt traffic in transit

    A war driving attack; deploying wired network connections as a redundant backup for critical systems

    Show answer

    Answer: (A)

    Identifying the electromagnetic signal flood as a jamming attack, which is a denial of service (DoS) attack that blocks wireless communication without stealing data. Because jamming physically disrupts the wireless medium, the most effective layered control is providing an alternative wired infrastructure so critical operations continue even when wireless access is unavailable.

  5. Question 5

    A university security team discovers that students in a campus parking lot have been using freely available software to scan for and log every wireless network beacon detectable from outside the library building, identifying which networks use outdated WEP encryption. Which combination of controls best addresses both the reconnaissance technique being used and the vulnerability it revealed?

    Reduce the access point transmit power to limit beacon range, and upgrade all networks from WEP to WPA3 encryption

    Deploy a VPN requirement for all users, and upgrade all networks from WEP to WPA3 encryption

    Reduce the access point transmit power to limit beacon range, and require users to verify the SSID before connecting

    Install electromagnetic shielding on all windows, and upgrade all networks from WEP to WPA3 encryption

    Show answer

    Answer: (A)

    Identifying the parking-lot beacon scanning as war driving, which exploits signals that extend beyond the building and reveals encryption weaknesses. Reducing transmit power limits how far beacons travel, directly countering the reconnaissance. Upgrading from WEP to WPA3 addresses the specific vulnerability war driving exposed, creating a layered defense that both shrinks the attack surface and hardens the remaining network.

  6. Question 6

    A penetration testing firm reports that an adversary group recently used an AI coding assistant to analyze a 500,000-line enterprise application codebase and identify three previously unknown buffer overflow vulnerabilities within hours. Which detection strategy would best help the enterprise identify whether those vulnerabilities have already been exploited?

    Review system logs and network traffic for anomalous patterns near the memory regions associated with the identified buffer overflow locations

    Restrict all developers from using AI coding assistants to prevent adversaries from accessing the same tools used internally

    Publish a corrected version of the codebase publicly to overwrite any false information adversaries may have introduced into AI training sets

    Require all employees to use shared secret phrases when discussing the vulnerabilities internally to prevent social engineering disclosures

    Show answer

    Answer: (A)

    AI-enhanced coding tools allow adversaries to find vulnerabilities in large codebases far faster than manual review. Once specific vulnerabilities are identified, defenders can detect exploitation attempts by examining logs and network traffic for anomalous behavior—unexpected crashes, unusual memory access patterns, or irregular outbound connections—that would indicate the vulnerabilities have been actively targeted.

  7. Question 7

    A script kiddie downloads a freely available port-scanning tool and uses it to probe a small retail company's network for open ports, eventually finding an unpatched service and gaining access. Which layered security controls would have been most effective against this type of adversary?

    A technical firewall blocking unnecessary open ports and a managerial patch management policy ensuring timely software updates

    Physical security cameras at all building entrances and managerial background checks for all new employees

    Technical encryption of all stored customer data and a managerial data classification policy for sensitive records

    A managerial incident response plan and technical forensic logging tools to analyze attacks after they occur

    Show answer

    Answer: (A)

    Script kiddies rely on widely available tools targeting well-known, unpatched vulnerabilities rather than developing novel exploits, so reducing the attack surface by closing unnecessary ports and eliminating known vulnerabilities through patching directly removes the conditions this adversary depends on. These two controls address both the reconnaissance finding and the exploitable weakness.

  8. Question 8

    A cybersecurity analyst notices that a series of network intrusion attempts all used the same freely available port-scanning tool and followed identical, well-documented attack patterns. The attempts were easily caught by the organization's intrusion detection system (IDS). Which adversary type is most consistent with this evidence, and what does the IDS's success reveal about detection effectiveness against this adversary?

    Script kiddies, because their reliance on publicly known tools with predictable signatures makes signature-based detection highly effective against them

    Transnational criminal organizations, because their use of shared ransomware tools creates recognizable patterns that signature-based detection identifies reliably

    Hacktivists, because their use of public protest tools generates consistent traffic patterns that behavioral detection identifies reliably

    Insider adversaries, because their use of approved network tools produces familiar traffic patterns that anomaly-based detection identifies reliably

    Show answer

    Answer: (A)

    Recognizing that script kiddies use tools built by others without understanding them, and that these tools produce well-documented attack patterns, explains why signature-based detection succeeds here. Because script kiddies do not customize their methods, their attacks match known signatures in IDS databases, making this adversary type the easiest to detect with standard detective controls.

  9. Question 9

    A global pharmaceutical company discovers that an organized criminal group encrypted its entire research database and demanded payment to restore access. The company's security logs show the attackers spent six weeks moving laterally through the network before deploying the ransomware. A perimeter firewall was in place throughout the intrusion. Which adversary type conducted this attack, and what does the six-week undetected lateral movement reveal about the firewall's limitation as a detection method?

    A transnational criminal organization, because firewalls inspect traffic at network boundaries but cannot detect adversaries already operating inside the network perimeter

    A cyberterrorist group, because firewalls filter traffic by protocol but cannot detect adversaries who use approved communication channels to move between internal systems

    A hacktivist collective, because firewalls block external connections but cannot detect adversaries who use social engineering to gain internal network access credentials

    An insider adversary, because firewalls enforce access policies but cannot detect employees who use their legitimate permissions to access research data across departments

    Show answer

    Answer: (A)

    Identifying the ransomware deployment and financial motivation as hallmarks of transnational criminal organizations, then connecting the six-week internal movement to the firewall's boundary-focused design, demonstrates evaluation of detection impact. Perimeter firewalls are preventative controls designed to block unauthorized entry, not detective controls capable of monitoring internal lateral movement once an adversary has established a foothold inside the network.

  10. Question 10

    After successfully exfiltrating a company's customer database, an adversary deletes all system log files on the compromised servers and removes the malware they installed during the attack. Which phase of the cyberattack does this represent, and what vulnerability does it exploit in the organization's defenses?

    Evading detection, exploiting the organization's reliance on log files as the primary evidence of intrusion

    Taking action, exploiting the organization's reliance on log files to destroy evidence of data theft

    Persistence, exploiting the organization's reliance on log files to remove traces of installed malware

    Lateral movement, exploiting the organization's reliance on log files to cover privilege escalation activity

    Show answer

    Answer: (A)

    Connecting the post-exfiltration cleanup activity to the evading-detection phase requires recognizing that removing logs and malware directly undermines the organization's ability to investigate the breach. EK 2.1.C.7 specifies that adversaries erase log files and planted files precisely because defenders depend on those records to reconstruct attack timelines.

What's on the AP Cybersecurity Unit 3 practice test

The standard version takes about 27 minutes and follows the timing and directions of the AP exam, sized to one unit:

  • 20 Multiple Choice Questions (27 minutes)

Questions are drawn from 833 multiple-choice questions written for Unit 3, Securing Networks.

Review Unit 3 before you start

Other AP Cybersecurity unit tests