BT Group Interview Questions and Answers

Reset and rebase are Git commands used to manage commit history and changes in a repository.

• Reset: Moves the current branch pointer to a specified commit, discarding changes.

• Example: 'git reset --hard HEAD~1' removes the last commit and all changes.

• Rebase: Integrates changes from one branch into another by replaying commits.

• Example: 'git rebase main' applies commits from the current branch on top of the main branch.

• Res...read more

Fail-safe and fail-fast iterators manage data integrity and performance during iteration in collections.

• Fail-fast iterators immediately throw an exception if the collection is modified during iteration. Example: Java's ArrayList iterator.

• Fail-safe iterators create a copy of the collection to allow safe iteration, even if the original collection is modified. Example: Java's CopyOnWriteArrayList.

• Fail-fast is generally fa...read more

Spring AOP (Aspect-Oriented Programming) is a framework that provides cross-cutting concerns in a modular way.

• Spring AOP enables separation of concerns by allowing the definition of aspects (cross-cutting concerns) separate from the main application logic.

• It allows developers to apply aspects to multiple classes without modifying the actual code of those classes.

• Examples of cross-cutting concerns that can be addressed ...read more

To troubleshoot Wi-Fi issues, check device settings, restart equipment, and ensure network availability.

• Check if Wi-Fi is enabled on the device. For example, on a laptop, ensure the Wi-Fi switch is turned on.

• Restart the device to refresh network settings.

• Verify that the Wi-Fi network is available and functioning by checking other devices.

• Forget the Wi-Fi network and reconnect by entering the password again.

• Check for an...read more

The OSI model is a conceptual framework that standardizes the functions of a telecommunication or computing system into seven layers.

• The OSI model stands for Open Systems Interconnection model.

• It helps in understanding how data is transferred from one computer to another over a network.

• The seven layers are: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Each layer has specific functions...read more

RAN stands for Radio Access Network, VLAN is Virtual Local Area Network, 4G and 5G are mobile network technologies, and incident management involves handling and resolving network issues.

• RAN (Radio Access Network) is a part of a mobile telecommunication system that connects individual devices to other parts of a network through radio connections.

• VLAN (Virtual Local Area Network) is a technology that allows multiple net...read more

In my last role, I managed technical service delivery, ensuring optimal performance and client satisfaction through effective solutions.

• Led a team of 10 in delivering IT services, achieving a 95% customer satisfaction rate.

• Implemented a new ticketing system that reduced response time by 30%.

• Conducted regular training sessions for staff on emerging technologies.

• Collaborated with cross-functional teams to streamline serv...read more

Experienced in Technical Service Delivery with a focus on customer satisfaction and efficient problem resolution.

• Managed a team of 10 in delivering IT support services, improving response time by 30%.

• Implemented a new ticketing system that reduced issue resolution time from 48 hours to 24 hours.

• Conducted training sessions for staff on new software tools, resulting in a 20% increase in productivity.

• Collaborated with cro...read more