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DevNet Associate (DEVASC) 200-901 Practice Test 50

Question 490

The initial implementation fails or does not meet the expected behavior. A new service works on localhost:8443 but remote clients time out even though DNS points at the right VM. Which investigation should be prioritized to diagnose the problem?

  1. Inspect TLS configuration, file permissions, encryption settings and retention rules.
  2. Inspect container exposed/listening ports, docker ps port mapping and curl response.
  3. Inspect listening sockets, path ACLs, SYN/SYN-ACK captures and proxy rules.
  4. Inspect docker images digests, docker inspect and container start logs.

Explanation

Correct Answer

C:

Inspect listening sockets, path ACLs, SYN/SYN-ACK captures and proxy rules. These are the relevant initial evidence checks for Firewall rule versus application listener. Intended action: Check host/service listener binding and the network firewall rule for TCP 8443 in the path. Expected success condition: A remote TCP connection and HTTPS request succeed after the required port is permitted and service is listening.

Incorrect Answers

A:

Inspect TLS configuration, file permissions, encryption settings and retention rules. This investigation primarily applies to Enforce HTTPS and protected storage, not the current Firewall rule versus application listener problem. Prioritize: Inspect listening sockets, path ACLs, SYN/SYN-ACK captures and proxy rules.

B:

Inspect container exposed/listening ports, docker ps port mapping and curl response. This investigation primarily applies to Map container host port correctly, not the current Firewall rule versus application listener problem. Prioritize: Inspect listening sockets, path ACLs, SYN/SYN-ACK captures and proxy rules.

D:

Inspect docker images digests, docker inspect and container start logs. This investigation primarily applies to Run version-pinned image locally, not the current Firewall rule versus application listener problem. Prioritize: Inspect listening sockets, path ACLs, SYN/SYN-ACK captures and proxy rules.

Question 491

A Cisco network automation team has this requirement: A status dashboard builds SELECT strings by concatenating an untrusted device name and an attacker supplies a quote plus SQL operators. Which design or implementation action best addresses it?

  1. Promote the exact immutable digest tested in CI to production rather than rebuilding from a moving branch.
  2. Use parameterized SQL queries rather than directly injecting the device name into statement text.
  3. Copy the pinned requirements file and install dependencies before copying frequently changing application source.
  4. Design a hybrid deployment with governed deidentified datasets, private connectivity and workload boundaries.

Explanation

Correct Answer

B:

Use parameterized SQL queries rather than directly injecting the device name into statement text. Technical reason: SQL parameters separate data values from executable query structure. Verify by: A malicious-looking device name is treated as literal data and cannot change the WHERE predicate. Deployment qualification: Database permissions and input validation remain necessary alongside parameters.

Incorrect Answers

A:

Promote the exact immutable digest tested in CI to production rather than rebuilding from a moving branch. This instead targets the different case Artifact promotion instead of rebuild drift. The described Parameterized SQL blocks injection requirement specifically calls for Use parameterized SQL queries rather than directly injecting the device name into statement text.

C:

Copy the pinned requirements file and install dependencies before copying frequently changing application source. This instead targets the different case Dockerfile layers and dependency caching. The described Parameterized SQL blocks injection requirement specifically calls for Use parameterized SQL queries rather than directly injecting the device name into statement text.

D:

Design a hybrid deployment with governed deidentified datasets, private connectivity and workload boundaries. This instead targets the different case Hybrid cloud for on-prem regulated data. The described Parameterized SQL blocks injection requirement specifically calls for Use parameterized SQL queries rather than directly injecting the device name into statement text.

Question 492

After deployment, an engineer must prove the proposed solution works. A status dashboard builds SELECT strings by concatenating an untrusted device name and an attacker supplies a quote plus SQL operators. Which observed result is the most direct acceptance evidence?

  1. A malicious-looking device name is treated as literal data and cannot change the WHERE predicate.
  2. A plaintext connection is rejected and unauthorized local users cannot read stored payloads.
  3. A source-only rebuild reuses the dependency layer while producing the new application layer.
  4. Controlled WAN failure does not prevent local alarms from being generated within the target latency.

Explanation

Correct Answer

A:

A malicious-looking device name is treated as literal data and cannot change the WHERE predicate. Recommended implementation: Use parameterized SQL queries rather than directly injecting the device name into statement text. Why the observation matters: SQL parameters separate data values from executable query structure.

Incorrect Answers

B:

A plaintext connection is rejected and unauthorized local users cannot read stored payloads. That observation could confirm Enforce HTTPS and protected storage, not the current Parameterized SQL blocks injection case. For this case, the decisive observation is: A malicious-looking device name is treated as literal data and cannot change the WHERE predicate.

C:

A source-only rebuild reuses the dependency layer while producing the new application layer. That observation could confirm Dockerfile layers and dependency caching, not the current Parameterized SQL blocks injection case. For this case, the decisive observation is: A malicious-looking device name is treated as literal data and cannot change the WHERE predicate.

D:

Controlled WAN failure does not prevent local alarms from being generated within the target latency. That observation could confirm Edge inference for camera safety alerts, not the current Parameterized SQL blocks injection case. For this case, the decisive observation is: A malicious-looking device name is treated as literal data and cannot change the WHERE predicate.

Question 493

A developer is explaining the underlying technical behavior. A status dashboard builds SELECT strings by concatenating an untrusted device name and an attacker supplies a quote plus SQL operators. Which principle is most relevant to this case?

  1. SQL parameters separate data values from executable query structure.
  2. Build layers and image metadata can persist values even after later instructions remove files.
  3. Containers package user-space applications while sharing the host kernel.
  4. Bare metal offers direct physical hardware access without an intervening virtual machine guest layer.

Explanation

Correct Answer

A:

SQL parameters separate data values from executable query structure. This mechanism explains Parameterized SQL blocks injection. Action: Use parameterized SQL queries rather than directly injecting the device name into statement text. Expected confirmation: A malicious-looking device name is treated as literal data and cannot change the WHERE predicate.

Incorrect Answers

B:

Build layers and image metadata can persist values even after later instructions remove files. This relates to Move secrets out of Docker layers. In the current Parameterized SQL blocks injection case the operative principle is: SQL parameters separate data values from executable query structure.

C:

Containers package user-space applications while sharing the host kernel. This relates to Container versus VM for reproducible app packaging. In the current Parameterized SQL blocks injection case the operative principle is: SQL parameters separate data values from executable query structure.

D:

Bare metal offers direct physical hardware access without an intervening virtual machine guest layer. This relates to Bare metal for specialized packet processing. In the current Parameterized SQL blocks injection case the operative principle is: SQL parameters separate data values from executable query structure.

Question 494

A team does not apply the necessary control or correction. A status dashboard builds SELECT strings by concatenating an untrusted device name and an attacker supplies a quote plus SQL operators. Which resulting failure or risk is most directly relevant?

  1. Secrets baked into an image can leak to anyone with registry access.
  2. Shipping all raw readings to a distant cloud can saturate a constrained link.
  3. A local shell variable not exported will be unavailable to child executables.
  4. String interpolation can turn user input into unauthorized SQL logic.

Explanation

Correct Answer

D:

String interpolation can turn user input into unauthorized SQL logic. This is the direct exposure for Parameterized SQL blocks injection. Mitigate with: Use parameterized SQL queries rather than directly injecting the device name into statement text. Check success by: A malicious-looking device name is treated as literal data and cannot change the WHERE predicate.

Incorrect Answers

A:

Secrets baked into an image can leak to anyone with registry access. This risk occurs in the different Move secrets out of Docker layers situation. For the given Parameterized SQL blocks injection requirement, the directly relevant risk is: String interpolation can turn user input into unauthorized SQL logic.

B:

Shipping all raw readings to a distant cloud can saturate a constrained link. This risk occurs in the different Edge aggregation for bandwidth-heavy telemetry situation. For the given Parameterized SQL blocks injection requirement, the directly relevant risk is: String interpolation can turn user input into unauthorized SQL logic.

C:

A local shell variable not exported will be unavailable to child executables. This risk occurs in the different Export environment variable for child process situation. For the given Parameterized SQL blocks injection requirement, the directly relevant risk is: String interpolation can turn user input into unauthorized SQL logic.

Question 495

The initial implementation fails or does not meet the expected behavior. A status dashboard builds SELECT strings by concatenating an untrusted device name and an attacker supplies a quote plus SQL operators. Which investigation should be prioritized to diagnose the problem?

  1. Inspect data flow diagrams, transformation controls, network paths and access tests.
  2. Inspect deployment frequency, canary metrics and rollback events.
  3. Inspect query construction, parameter bindings and controlled injection tests.
  4. Inspect test discovery, method name and assertion outcome.

Explanation

Correct Answer

C:

Inspect query construction, parameter bindings and controlled injection tests. These are the relevant initial evidence checks for Parameterized SQL blocks injection. Intended action: Use parameterized SQL queries rather than directly injecting the device name into statement text. Expected success condition: A malicious-looking device name is treated as literal data and cannot change the WHERE predicate.

Incorrect Answers

A:

Inspect data flow diagrams, transformation controls, network paths and access tests. This investigation primarily applies to Hybrid cloud for on-prem regulated data, not the current Parameterized SQL blocks injection problem. Prioritize: Inspect query construction, parameter bindings and controlled injection tests.

B:

Inspect deployment frequency, canary metrics and rollback events. This investigation primarily applies to Small safe releases with observability, not the current Parameterized SQL blocks injection problem. Prioritize: Inspect query construction, parameter bindings and controlled injection tests.

D:

Inspect test discovery, method name and assertion outcome. This investigation primarily applies to Python unittest test-case assertion, not the current Parameterized SQL blocks injection problem. Prioritize: Inspect query construction, parameter bindings and controlled injection tests.

Question 496

A Cisco network automation team has this requirement: A network incident comment containing <script> is stored as text but an HTML dashboard renders it without encoding. Which design or implementation action best addresses it?

  1. Encode untrusted comment output for its HTML context and apply appropriate content-security controls.
  2. Check host/service listener binding and the network firewall rule for TCP 8443 in the path.
  3. Aggregate and filter readings at an authorized edge gateway before sending summaries upstream.
  4. Export the variable before launching the Python process or pass it explicitly in the child environment.

Explanation

Correct Answer

A:

Encode untrusted comment output for its HTML context and apply appropriate content-security controls. Technical reason: Cross-site scripting occurs when untrusted values are interpreted as executable browser content. Verify by: The literal markup is displayed as text and no JavaScript runs when the comment is viewed. Deployment qualification: Output context matters: HTML, attribute, URL and JavaScript contexts require different handling.

Incorrect Answers

B:

Check host/service listener binding and the network firewall rule for TCP 8443 in the path. This instead targets the different case Firewall rule versus application listener. The described Escape output to prevent stored XSS requirement specifically calls for Encode untrusted comment output for its HTML context and apply appropriate content-security controls.

C:

Aggregate and filter readings at an authorized edge gateway before sending summaries upstream. This instead targets the different case Edge aggregation for bandwidth-heavy telemetry. The described Escape output to prevent stored XSS requirement specifically calls for Encode untrusted comment output for its HTML context and apply appropriate content-security controls.

D:

Export the variable before launching the Python process or pass it explicitly in the child environment. This instead targets the different case Export environment variable for child process. The described Escape output to prevent stored XSS requirement specifically calls for Encode untrusted comment output for its HTML context and apply appropriate content-security controls.

Question 497

After deployment, an engineer must prove the proposed solution works. A network incident comment containing <script> is stored as text but an HTML dashboard renders it without encoding. Which observed result is the most direct acceptance evidence?

  1. The literal markup is displayed as text and no JavaScript runs when the comment is viewed.
  2. Image inspection reveals no token and the running service authenticates using its injected secret.
  3. A plaintext connection is rejected and unauthorized local users cannot read stored payloads.
  4. Controlled WAN failure does not prevent local alarms from being generated within the target latency.

Explanation

Correct Answer

A:

The literal markup is displayed as text and no JavaScript runs when the comment is viewed. Recommended implementation: Encode untrusted comment output for its HTML context and apply appropriate content-security controls. Why the observation matters: Cross-site scripting occurs when untrusted values are interpreted as executable browser content.

Incorrect Answers

B:

Image inspection reveals no token and the running service authenticates using its injected secret. That observation could confirm Move secrets out of Docker layers, not the current Escape output to prevent stored XSS case. For this case, the decisive observation is: The literal markup is displayed as text and no JavaScript runs when the comment is viewed.

C:

A plaintext connection is rejected and unauthorized local users cannot read stored payloads. That observation could confirm Enforce HTTPS and protected storage, not the current Escape output to prevent stored XSS case. For this case, the decisive observation is: The literal markup is displayed as text and no JavaScript runs when the comment is viewed.

D:

Controlled WAN failure does not prevent local alarms from being generated within the target latency. That observation could confirm Edge inference for camera safety alerts, not the current Escape output to prevent stored XSS case. For this case, the decisive observation is: The literal markup is displayed as text and no JavaScript runs when the comment is viewed.

Question 498

A developer is explaining the underlying technical behavior. A network incident comment containing <script> is stored as text but an HTML dashboard renders it without encoding. Which principle is most relevant to this case?

  1. Only exported shell variables are inherited by normal subprocesses.
  2. Cross-site scripting occurs when untrusted values are interpreted as executable browser content.
  3. Artifact immutability links tested software bytes to the released deployment.
  4. Shell expansion and word splitting operate on unquoted variable contents.

Explanation

Correct Answer

B:

Cross-site scripting occurs when untrusted values are interpreted as executable browser content. This mechanism explains Escape output to prevent stored XSS. Action: Encode untrusted comment output for its HTML context and apply appropriate content-security controls. Expected confirmation: The literal markup is displayed as text and no JavaScript runs when the comment is viewed.

Incorrect Answers

A:

Only exported shell variables are inherited by normal subprocesses. This relates to Export environment variable for child process. In the current Escape output to prevent stored XSS case the operative principle is: Cross-site scripting occurs when untrusted values are interpreted as executable browser content.

C:

Artifact immutability links tested software bytes to the released deployment. This relates to Artifact promotion instead of rebuild drift. In the current Escape output to prevent stored XSS case the operative principle is: Cross-site scripting occurs when untrusted values are interpreted as executable browser content.

D:

Shell expansion and word splitting operate on unquoted variable contents. This relates to Bash quote paths with spaces. In the current Escape output to prevent stored XSS case the operative principle is: Cross-site scripting occurs when untrusted values are interpreted as executable browser content.

Question 499

A team does not apply the necessary control or correction. A network incident comment containing <script> is stored as text but an HTML dashboard renders it without encoding. Which resulting failure or risk is most directly relevant?

  1. Unescaped incident descriptions can steal session data or trigger actions under a viewer's identity.
  2. A build-time server command can hang builds or leave the final image without a running service.
  3. Copying Python packages manually between hosts can produce inconsistent environments.
  4. Poor instruction ordering makes image builds slower and less reproducible.

Explanation

Correct Answer

A:

Unescaped incident descriptions can steal session data or trigger actions under a viewer's identity. This is the direct exposure for Escape output to prevent stored XSS. Mitigate with: Encode untrusted comment output for its HTML context and apply appropriate content-security controls. Check success by: The literal markup is displayed as text and no JavaScript runs when the comment is viewed.

Incorrect Answers

B:

A build-time server command can hang builds or leave the final image without a running service. This risk occurs in the different Dockerfile CMD versus RUN situation. For the given Escape output to prevent stored XSS requirement, the directly relevant risk is: Unescaped incident descriptions can steal session data or trigger actions under a viewer's identity.

C:

Copying Python packages manually between hosts can produce inconsistent environments. This risk occurs in the different Container versus VM for reproducible app packaging situation. For the given Escape output to prevent stored XSS requirement, the directly relevant risk is: Unescaped incident descriptions can steal session data or trigger actions under a viewer's identity.

D:

Poor instruction ordering makes image builds slower and less reproducible. This risk occurs in the different Dockerfile layers and dependency caching situation. For the given Escape output to prevent stored XSS requirement, the directly relevant risk is: Unescaped incident descriptions can steal session data or trigger actions under a viewer's identity.

Question 500

The initial implementation fails or does not meet the expected behavior. A network incident comment containing <script> is stored as text but an HTML dashboard renders it without encoding. Which investigation should be prioritized to diagnose the problem?

  1. Inspect container exposed/listening ports, docker ps port mapping and curl response.
  2. Inspect pipeline stage ordering, pass/fail status and artifact provenance.
  3. Compare CI artifact digest, registry manifest and deployed workload image reference.
  4. Inspect response HTML encoding, browser console and a harmless injection fixture.

Explanation

Correct Answer

D:

Inspect response HTML encoding, browser console and a harmless injection fixture. These are the relevant initial evidence checks for Escape output to prevent stored XSS. Intended action: Encode untrusted comment output for its HTML context and apply appropriate content-security controls. Expected success condition: The literal markup is displayed as text and no JavaScript runs when the comment is viewed.

Incorrect Answers

A:

Inspect container exposed/listening ports, docker ps port mapping and curl response. This investigation primarily applies to Map container host port correctly, not the current Escape output to prevent stored XSS problem. Prioritize: Inspect response HTML encoding, browser console and a harmless injection fixture.

B:

Inspect pipeline stage ordering, pass/fail status and artifact provenance. This investigation primarily applies to CI gates before application deploy, not the current Escape output to prevent stored XSS problem. Prioritize: Inspect response HTML encoding, browser console and a harmless injection fixture.

C:

Compare CI artifact digest, registry manifest and deployed workload image reference. This investigation primarily applies to Artifact promotion instead of rebuild drift, not the current Escape output to prevent stored XSS problem. Prioritize: Inspect response HTML encoding, browser console and a harmless injection fixture.

DevNet Associate (DEVASC) (200-901) Practice Tests

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