Cisco 100-490 Exam Prep Course (Premium File)
AI-Powered Supporting Cisco Routing & Switching Network Devices Exam - Pass on Your First Try

Last updated on Apr 06, 2026

 100-490 Practice Exam
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All Supporting Cisco Routing & Switching Network Devices certification learning material, study guide, training courses are created by a team of Cisco training experts. The Study Guide and .EXM training software files contain relevant Supporting Cisco Routing & Switching Network Devices content, labs, practice questions and explanation. This 100-490 exam guide and training courses is based on the latest exam outlines available!

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Preparing and Passing the Cisco® 100-490 Exam

Are you a student aspiring to excel in the field of networking? The Cisco® 100-490 exam is a vital stepping stone towards achieving your goals. This article will provide you with comprehensive information and actionable tips to prepare for and pass the Cisco® 100-490 exam successfully.

About the Cisco® 100-490 Exam

The Cisco® 100-490 exam, also known as the Supporting Cisco Routing & Switching Network Devices (RSTECH) exam, is designed to test your knowledge and skills in supporting small- to medium-sized enterprise networks. It validates your understanding of network fundamentals, network access, IP connectivity and services, security fundamentals, automation, and programmability.

To ensure the accuracy and up-to-date information, let's gather insights directly from the official Cisco® website.

Exam Details

According to the Cisco® website, the key details of the 100-490 exam are as follows:

  • Exam Code: 100-490 RSTECH
  • Exam Duration: 90 minutes
  • Number of Questions: The exam consists of 55-65 questions.
  • Exam Format: Multiple choice and performance-based questions
  • Passing Score: Cisco does not disclose the exact passing score, but it is generally around 800-850 on a scale of 1000.
  • Exam Language: English
  • Exam Cost: The cost of the exam may vary based on your location. It is recommended to visit the Cisco® website or contact their authorized testing provider for the most accurate pricing details.

Tips for Exam Preparation

Now that we have a clear understanding of the exam, let's explore some actionable tips to help you prepare effectively:

1. Familiarize Yourself with Exam Objectives

Start by reviewing the official exam objectives provided by Cisco®. These objectives outline the topics and subtopics that you need to focus on during your preparation. Make sure you have a solid grasp of each objective and allocate sufficient study time accordingly.

2. Create a Study Plan

Developing a structured study plan will help you stay organized and cover all the necessary material. Divide your study time into smaller, manageable segments and allocate specific topics to each session. Set realistic goals and track your progress regularly to ensure you stay on track.

3. Utilize Cisco® Learning Resources

Cisco® offers a wide range of learning resources to assist candidates in their exam preparation. Take advantage of these resources, such as official study guides, online courses, practice exams, and virtual labs. These materials are designed to enhance your understanding of the exam topics and provide hands-on experience.

4. Hands-on Practice

Practical experience is crucial when preparing for the Cisco® 100-490 exam. Set up a lab environment using Cisco® network equipment or utilize network simulation software to gain hands-on experience with configuring, troubleshooting, and managing network devices. This practical exposure will reinforce your theoretical knowledge and help you tackle real-world scenarios presented in the exam.

5. Join Study Groups or Forums

Engaging in study groups or online forums dedicated to Cisco® certification exams can provide valuable insights and a platform for discussion. Interacting with fellow candidates, sharing knowledge, and seeking clarification on challenging topics can significantly enhance your understanding and boost your confidence.

6. Practice Time Management

The Cisco® 100-490 exam has a limited duration, so it's essential to manage your time effectively during the exam. Practice solving questions within the given time constraints to improve your speed and accuracy. This will ensure that you can complete all the questions within the allocated time frame.

7. Review and Practice Regularly

Consistency is key when it comes to exam preparation. Review previously covered topics regularly to reinforce your understanding and identify any areas that require further attention. Additionally, practice sample questions and mock exams to familiarize yourself with the exam format and assess your readiness.

By following these tips and adopting a dedicated study approach, you'll be well-prepared to tackle the Cisco® 100-490 exam and increase your chances of success.

Remember, the Cisco® 100-490 exam is a stepping stone in your networking career, and a strong foundation is essential. With the right mindset, commitment, and thorough preparation, you can confidently work towards achieving your certification goals.

Best of luck on your journey towards becoming a certified Cisco® professional!

Cisco

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Question 1813:
Correct answer: C

  • SAST (Static Analysis Security Testing) identifies security vulnerabilities in source code in the development environment by analyzing the code without executing it. It’s typically integrated into the SDLC (e.g., during coding or CI/CD) to catch issues early.

Why the others are less appropriate for this scenario:
  • DAST (Dynamic Analysis Security Testing) tests a running application from an external perspective to find runtime vulnerabilities, not the source code.
  • IAST (Interactive Application Security Testing) instruments the running app to detect issues during execution, blending dynamic and some static insights.
  • RASP (Runtime Application Self-Protection) provides protections at runtime inside the application; not a source-code analysis method.

Riyadh, Saudi Arabia

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Question 1811:
Correct answer: D
Reason:

  • If encryption keys are not centrally managed, the DLP tool cannot reliably decrypt and inspect data across the environment. This creates blind spots, weak access control, and auditing issues, undermining the effectiveness of pre-implementation DLP deployment.

Why the others are less critical in this context:
  • Monitor mode vs block mode affects enforcement; monitor-only reduces effectiveness but is not as fundamental a risk as broken key management.
  • Crawlers to discover sensitive data help inventory and classify data; not a primary risk to DLP functionality.
  • Deep packet inspection in transit raises privacy/compliance and performance concerns, but is a known DLP trade-off and manageable with policy controls; key management remains the strongest blocker to effective DLP.

Riyadh, Saudi Arabia

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Question 121:

  • Correct answer: B — a virtual network for FinServer and another virtual network for all the other servers.

  • Why:
- In Azure, network segmentation is done with VNets. Putting FinServer in a separate VNet gives it its own IP space and network boundaries, isolating it from the other servers. - A resource group is for organizing resources and RBAC, not for network isolation. - A VPN with a gateway or multiple gateways is unnecessary for simple separation; it’s used for connectivity, not just segmentation. - One resource group with a lock does not affect network isolation.
  • Quick note:
- If you later need communication between the two VNets, you can use VNet peering (or a VPN gateway) to enable controlled connectivity while maintaining isolation.

Rudolfstetten, Switzerland

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Question 86:

  • Correct answer: Vertical scaling

  • Why: Vertical scaling (scale up/down) means increasing or decreasing the size of a VM by adding memory or CPUs to the same VM. It updates the capacity of a single instance rather than adding more instances.

  • How it compares to other terms:
- Horizontal scaling (scale out/in): changes the number of VM instances, not the size of each one. - Elasticity: broad concept of adapting resources to demand (includes vertical and horizontal scaling). - Agility: general capability; not specific to VM capacity.
  • Takeaway: Use vertical scaling when you need more compute power in a single VM; use horizontal scaling to handle larger workloads by adding more VMs.

Rudolfstetten, Switzerland

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Question 73:
I can’t see the image-based statements in Question 73, so I can’t tell which specific statements are true. But I can explain what this type of question is testing and how to decide Yes/No.
What Question 73 is testing

  • Your understanding of the cloud service models and the shared responsibility model: IaaS, PaaS, and SaaS.
  • For each statement you must decide if it describes the correct responsibility split between you (the customer) and the cloud provider.

Key responsibilities by service model
  • IaaS: You manage the guest OS, applications, and data. The provider manages virtualization, servers, storage, and networking.
  • PaaS: You manage the applications and data. The provider manages the OS, runtime, middleware, and underlying platform.
  • SaaS: You primarily manage user data and access; the provider handles the entire application, runtime, OS, and underlying infrastructure.

How to approach
  • If a statement says you’re responsible for patching the operating system, that’s true for IaaS but false for PaaS/SaaS.
  • If a statement says the provider handles the hardware and network, that’s true for all three, but more specific responsibilities depend on the model.

If you paste the exact statements from Q73, I’ll mark each as Yes/No and explain why.

Rudolfstetten, Switzerland

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Question 25:

  • Correct answer: D: a new Cognitive Services resource that uses the S0 pricing tier.

  • Why: To enable OCR and text analytics in a Cognitive Search enrichment pipeline, you must attach a Cognitive Services resource to the skillset. For cost efficiency on a large document set, choose the base standard tier (S0) rather than higher tiers or a free tier, which may limit enrichments. The OCR capability comes from the Cognitive Services (Computer Vision/Read) and the S0 tier provides a balance of capability and cost.

Singapore, Singapore

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Question 20:

  • Correct answer: D and E.

  • Why: Provisioning a QnA Maker service creates:
- Azure App Service to host the QnA Maker web API (your App Service Plan AP1 will host the App Service resource). - Azure Cognitive Search to enable fast search over the knowledge base.
  • Why not the others:
- Language Understanding, Azure SQL Database, and Azure Storage are not automatically created by QnA Maker provisioning.
  • Quick note: After provisioning, check RG1 to verify the new App Service and Cognitive Search resources.

Singapore, Singapore

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what if different between speech recognizer and speach synthesizer

  • Speech Recognizer (Speech-to-Text): Converts audio input (live mic or audio file) into text. Output is transcripts with timestamps, confidence scores, and optional punctuation. Use cases: meeting transcripts, voice commands, real-time captions.

  • Speech Synthesizer (Text-to-Speech): Converts text (or SSML) into audio output. Output is audio data (wav/mp3 or streaming). Use cases: voice prompts, IVR responses, accessibility narrations. You can choose voices, languages, and adjust prosody (rate, pitch, volume).

  • Key differences:
- Input: Recognizer takes audio; Synthesizer takes text/SSML. - Output: Recognizer ? text; Synthesizer ? audio. - Features: Recognizer provides transcripts and timing; Synthesizer provides customizable voices (neural, SSML), multiple languages. - Typical scenarios: Transcription vs. generating spoken content.
  • Quick example: Use Speech Recognizer to transcribe a meeting; use Speech Synthesizer to read a script aloud in a chosen voice.

Singapore, Singapore

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Question 17:

  • Correct answer: A Anomaly Detector.

  • Why: Anomaly Detector is designed to identify unusual values in time-series data. Your scenario has 100 machines × 50 sensors, generating minute-by-minute data, totaling 5,000 time-series. Anomaly Detector can process each time-series (or batches of series) to flag deviations that may indicate potential failures, which is exactly what you need for predictive maintenance.

  • Why not the others:
- Cognitive Search is for indexing and querying content, not for detecting anomalies in time-series data. - Form Recognizer extracts data from forms, not time-series sensor data. - Custom Vision analyzes images, not numeric sensor streams.
  • Practical note: with 5,000 time series, you’d typically run anomaly detection per series (potentially in parallel) and aggregate results to identify which machines/sensors warrant attention.

Singapore, Singapore

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Question 12:

  • Correct answers: A, B, F.

  • Why:
- A. The index size will increase. Enabling CMK encryption adds encryption metadata and key management data, which increases index size. - B. Query times will increase. Encryption/decryption overhead and key retrieval can slow queries. - F. Azure Key Vault is required. CMK means you store/manage keys in Key Vault; it’s a billable, required service for CMK.
  • Why the other options are incorrect:
- C (self-signed X.509 certificate required) is not a requirement for CMK. - D (index size will decrease) and E (query times will decrease) contradict the expected impact of CMK.

Singapore, Singapore