Commonwealth Bank of Australia, India Interview Questions and Answers

Q1. BGP Question - There are 2 routers in your organisation each connected to different ISP via EBGP. And your 2 routers are connected each other using IBGP. What is the problem in the setup. Expected Answer -...read more
Ans. 
IBGP setup can lead to unintended transit AS issues; implement route filtering to prevent this.
• IBGP routers do not advertise routes learned from one IBGP peer to another, preventing loops.

• Without proper configuration, internal routers may inadvertently become transit AS for external traffic.

• Use route filtering or prefix lists to control which routes are advertised to prevent transit behavior.

• Implementing a route reflec...read more
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Q2. On what layer of OSI model does BGP operate?
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BGP operates at the Application layer (Layer 7) of the OSI model, facilitating inter-domain routing between autonomous systems.
• BGP (Border Gateway Protocol) is used for routing between different autonomous systems on the internet.

• It operates at the Application layer, which is responsible for end-user services and application-level protocols.

• BGP uses TCP (Transmission Control Protocol) for reliable communication, which ...read more
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Q3. What are benefits of VXLAN?
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VXLAN enhances network scalability, flexibility, and isolation in virtualized environments through encapsulation and overlay networks.
• Scalability: Supports up to 16 million unique segments, far exceeding VLAN limits.

• Overlay Networking: Allows for the creation of virtual networks over existing physical infrastructure.

• Multitenancy: Provides isolation between different tenants in a cloud environment, enhancing security.

• Mo...read more
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Q1. Detailed project questions
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Q2. Explain completed gen ai project
Ans. 
Developed a generative AI model to create realistic images of fictional characters.
• Used GANs (Generative Adversarial Networks) to generate new images based on existing data.

• Trained the model on a dataset of character images from various sources.

• Implemented techniques like style transfer to enhance the diversity and creativity of generated images.

• Evaluated the model's performance based on image quality metrics and user ...read more
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Q1. Pusedo code explain and improve
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Pseudo code explanation and improvement for better understanding and efficiency
• Pseudo code is a high-level description of a computer program or algorithm

• It uses natural language mixed with programming language-like syntax

• Improvements can include adding comments for clarity, using proper indentation, and simplifying complex logic

• Example: Original pseudo code - 'if x > 5 then print 'Hello World' else print 'Goodbye'

• Impro...read more
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Q2. Explain framework
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A framework is a set of guidelines, libraries, and tools used to develop and maintain software applications.
• Provides structure and organization for code

• Promotes code reusability

• Facilitates automation and testing

• Examples: Selenium for web automation, JUnit for unit testing
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Agile and day to day working
Stakeholders and conflict management

Q1. Salary and benefits
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Q2. Ways of working
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Effective ways of working include clear communication, collaboration, prioritization, and continuous improvement.
• Clear communication is essential for sharing information and avoiding misunderstandings.

• Collaboration helps team members work together towards common goals.

• Prioritization ensures that tasks are completed in the most efficient order.

• Continuous improvement involves learning from mistakes and finding ways to wo...read more
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Q1. How will you resolve the issue if you get a highly escalated Severity 1 issue, and you have to resolve it in 30 minutes?
Ans. 
I would prioritize the issue, gather a cross-functional team, and work quickly to identify and resolve the root cause.
• Prioritize the severity of the issue and focus on resolving it within the given time frame

• Gather a cross-functional team with expertise in different areas to quickly address the issue

• Utilize all available resources and tools to identify the root cause and implement a solution

• Communicate effectively with...read more
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Q2. What will you do if you are not able to run any command in linux.
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I would troubleshoot the issue by checking for any error messages, verifying permissions, and consulting documentation or online resources.
• Check for any error messages in the terminal

• Verify permissions for the command being run

• Consult documentation or online resources for troubleshooting steps

• Try running the command with sudo if necessary
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Q1. Screen sharing session with in-depth live troubleshootinng scenario based questions.
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Q2. How will you troubleshoot booting related issues?
Ans. 
I will troubleshoot booting related issues by checking hardware connections, running diagnostics, and updating software.
• Check hardware connections to ensure everything is properly connected

• Run diagnostics to identify any hardware issues

• Update software and drivers to ensure compatibility and functionality
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Q1. Salary Discussion....
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Q2. Work Shift Discussion
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Q1. Difference between MAPE, MSE, R2, RMSE
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MAPE measures the percentage error, MSE and RMSE measure the average squared error, R2 measures the proportion of variance explained.
• MAPE (Mean Absolute Percentage Error) measures the percentage error between actual and predicted values.

• MSE (Mean Squared Error) measures the average squared difference between actual and predicted values.

• RMSE (Root Mean Squared Error) is the square root of MSE, providing a more interpret...read more
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Q2. Evaluation metrics while training the model.
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Evaluation metrics are used to assess the performance of a model during training.
• Common evaluation metrics include accuracy, precision, recall, F1 score, and ROC-AUC.

• Accuracy measures the proportion of correctly classified instances out of the total instances.

• Precision measures the proportion of true positive predictions out of all positive predictions.

• Recall measures the proportion of true positive predictions out of ...read more
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Q1. What's Kubernetes
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Kubernetes is an open-source platform for automating the deployment, scaling, and management of containerized applications.
• Orchestrates containerized applications across a cluster of machines.

• Supports various container runtimes like Docker and containerd.

• Provides features like load balancing, scaling, and self-healing.

• Uses YAML files for configuration and deployment.

• Example: Deploying a web application with multiple mi...read more
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Q2. Can we peer vpc with same cidr block
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No, VPCs with the same CIDR block cannot be peered due to IP address conflicts.
• VPC peering requires unique CIDR blocks for each VPC.

• If two VPCs have overlapping CIDR blocks, routing conflicts arise.

• Example: VPC A (10.0.0.0/16) and VPC B (10.0.0.0/16) cannot be peered.

• AWS enforces this rule to maintain network integrity and avoid IP address conflicts.
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