INFINERA (NOKIA) IS HIRING : SW QA ENGR 1

Nokia is hiring Freshers Candidates For SW QA Engineer. The details of the job, requirements and other information given below:

INFINERA (NOKIA) IS HIRING : SW QA ENGR 1

• Qualification : Bachelor’s degree in Telecommunications, Electrical Engineering, Computer Science, or a related field.
• 0-2 years of experience in telecom/optical network testing or QA.
• Strong understanding of optical networking concepts such as DWDM, SDH/SONET, OTN, Ethernet, ROADM, and fiber topologies.
• Hands-on experience with optical network planning/design tools
• Familiarity with Layer 0/1/2 network topologies and traffic engineering principles.
• Experience with test management and defect tracking tools (e.g., JIRA, TestRail).
• Knowledge of scripting languages (Python, Selenium, Rest API) for automation is a plus.
• Strong analytical and problem-solving skills.
• Location: Bangalore

Don’t miss out, CLICK HERE (to apply before the link expires)

Optical Network Planning Tool Tester – Interview Questions and Answers (Infinera)

1. Can you explain what DWDM is and why it is important in optical networks?

Answer:

DWDM stands for Dense Wavelength Division Multiplexing. It is a technology used in optical fiber networks to transmit multiple data signals simultaneously on the same fiber, using different light wavelengths.

It’s important because it:

• Increases the capacity of the fiber without laying more cables

• Supports long-distance, high-speed data transmission

• Is widely used in backbone telecom networks

In simple words, it’s like sending multiple trains (data) on the same track (fiber) but each train uses a different color of light (wavelength).

2. What is OTN and how is it different from SDH/SONET?

Answer:

OTN stands for Optical Transport Network. It is a modern transport protocol designed to carry large volumes of data over optical fiber networks.

Difference from SDH/SONET:

• SDH/SONET is older and used for carrying voice and smaller data

• OTN supports modern high-speed services like 10G, 100G and is better for Ethernet and IP traffic

• OTN has better error correction and performance monitoring features

Think of OTN as the “next generation” of transport for modern telecom networks.

3. What do you understand by ROADM and how is it useful?

Answer:

ROADM stands for Reconfigurable Optical Add-Drop Multiplexer. It is a device used in optical networks that allows dynamic control of wavelengths.

ROADM helps in:

• Adding or dropping specific wavelengths at intermediate points

• Automating traffic changes without manual work

• Saving time and cost in network management

In simple terms, it’s like a smart traffic signal in the fiber world – it can control which data goes where, automatically.

4. What is the role of a Test Engineer in Optical Network Planning Tools?

Answer:

As a Test Engineer, your main job is to ensure that the planning software is working correctly.

Your responsibilities include:

• Creating and running test cases

• Validating if the tool gives correct output for different network designs

• Checking performance and speed of the tool

• Reporting bugs using tools like JIRA

• Working with developers and engineers to fix issues

You are like a quality gatekeeper who ensures that the software is reliable before it reaches users.

5. What tools have you used for software testing or defect tracking?

Answer:

Common tools used are:

• JIRA: For reporting and tracking software bugs

• TestRail: For managing test cases and test execution

• Bugzilla: Another bug tracking tool

• Selenium: For automating test cases (if used)

• Python: For writing scripts to test or simulate use cases

Even if you’re a fresher, knowing the basic use of JIRA and Python will give you an advantage.

6. Do you know any scripting languages? How can they help in testing?

Answer:

Yes, scripting languages like Python or Bash are helpful.

They help in:

• Writing automation scripts to test software faster

• Simulating network traffic or user actions

• Validating multiple scenarios without manual work

For example, using Python with REST APIs, you can test how the planning tool behaves when certain network parameters are changed.

7. What is Layer 0, Layer 1, and Layer 2 in telecom networking?

Answer:

These are layers in the OSI Model, important in optical and telecom networking:

• Layer 0 (Physical Layer): Deals with fiber cables, light signals, amplifiers

• Layer 1 (Data Transport Layer): Involves technologies like OTN, SDH – manages transmission of data

• Layer 2 (Data Link Layer): Deals with Ethernet frames, switching, MAC addresses

In optical network planning, all these layers are considered for accurate simulation and testing.

8. How do you write a good test case for a network planning tool?

Answer:

A good test case includes:

• Objective: What are you testing? (e.g., route calculation)

• Preconditions: Initial setup required (e.g., fiber map loaded)

• Test Steps: Detailed steps to follow

• Expected Result: What should happen (e.g., optimal route should be shown)

• Actual Result: What actually happened during testing

Test cases should be simple, repeatable, and cover both normal and edge cases.

9. What do you do if the tool shows incorrect network simulation results?

Answer:

If simulation results are wrong, I would:

1. Re-check the input data and parameters

2. Review the test case for correctness

3. Report the issue in JIRA with detailed logs, screenshots

4. Work with developers or network engineers to reproduce the issue

5. Retest once the fix is applied

It’s important to communicate clearly and document everything.

10. Do you know about Agile methodology or DevOps practices?

Answer:

Yes, in Agile:

• Work is done in short cycles (sprints)

• We give continuous feedback and improve the product quickly

• QA is part of the team and involved early in development

DevOps helps in:

• Automating deployment and testing

• Continuous Integration/Continuous Delivery (CI/CD)

• Making software delivery faster and reliable

Knowing Agile and DevOps shows that I can work in a modern software environment.

Bonus Tip – Behavioral Question: How do you handle pressure during tight deadlines?

Answer:

I stay calm, focus on priorities, and break down tasks into smaller parts. I communicate clearly with my team and manager if more support is needed. I believe in planning ahead and avoiding last-minute confusion. Being proactive and organized helps me handle pressure well.Final Suggestions for Candidates

• Learn basic concepts of optical networks (YouTube or NPTEL videos)

• Practice using JIRA and writing sample test cases

• Revise Python basics (especially REST API or automation scripts)

• Go through SDH, DWDM, ROADM basics from telecom books or online blogs

• Be confident and communicate clearly in the interview

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