10+ Archelons Consulting Interview Questions and Answers

Configuring IPsec tunnel for 3 different locations and explaining traffic flow

• Configure IPsec tunnel on routers/firewalls at each location

• Set up IPsec policies for encryption and authentication

• Define IPsec tunnel endpoints and establish secure communication

• Ensure proper routing between locations for traffic flow

• Monitor and troubleshoot the IPsec tunnel for any issues

SSL VPN allows remote users to securely access the network from any location.

• SSL VPN uses encryption to secure the connection between the remote user and the network.

• It authenticates users before granting access to resources.

• SSL VPN can be set up using a web browser or a client application.

• It provides a secure way for remote employees to access company resources.

• SSL VPN can be configured to restrict access based on user roles or permissions.

To troubleshoot both locations IPsec tunnel being down, check configurations, network connectivity, and security policies.

• Check the IPsec configurations on both ends to ensure they match

• Verify network connectivity between the two locations

• Check firewall and security policies to ensure they are not blocking the IPsec traffic

• Review logs on both ends for any error messages or indications of the issue

• Restart the IPsec services or devices if necessary

To upgrade to Palo Alto firewall and Fortigate, follow these steps: plan the upgrade, backup configurations, test the upgrade in a lab environment, schedule downtime, perform the upgrade, test functionality post-upgrade.

• Plan the upgrade by determining the current firewall configurations and requirements for the new firewalls.

• Backup configurations of the existing firewalls to ensure data safety in case of any issues during the upgrade process.

• Test the upgrade in a lab environm...read more

No, arithmetic operations cannot be performed on unique pointers.

• Unique pointers are used to manage the lifetime of dynamically allocated objects.

• They cannot be copied or assigned, only moved.

• Arithmetic operations are not defined for pointers, including unique pointers.

To create an IPsec tunnel, configure the necessary parameters on both ends of the connection.

• Configure the IPsec parameters such as encryption algorithms, authentication methods, and key exchange protocols on both the source and destination devices.

• Establish a secure communication channel by setting up the IPsec tunnel between the two endpoints.

• Ensure that the IPsec tunnel is properly configured and tested for secure data transmission.

• Monitor the IPsec tunnel for any potentia...read more

To troubleshoot an IPsec tunnel, check configurations, verify connectivity, monitor logs, and use packet capture tools.

• Check the IPsec configuration on both ends to ensure they match

• Verify that the tunnel endpoints can reach each other

• Monitor logs on both devices for any error messages related to the tunnel

• Use packet capture tools like Wireshark to analyze traffic going through the tunnel

Abstract Factory is a creational design pattern that provides an interface for creating families of related objects.

• Abstract Factory is used when we need to create families of related objects without specifying their concrete classes.

• It provides an interface for creating objects of related classes without specifying their concrete classes.

• It encapsulates a group of factories that have a common theme.

• It promotes loose coupling by hiding the concrete classes from the client.

• Exa...read more

Static code analysis tools are software programs that analyze source code to find potential issues and improve code quality.

• Static code analysis tools scan code without executing it

• They can detect issues such as security vulnerabilities, coding errors, and performance problems

• Examples of static code analysis tools include SonarQube, ESLint, and Checkstyle

Detached threads are independent threads that run separately from the main thread. Joined threads are threads that wait for the main thread to finish.

• Detached threads are created using pthread_detach() function

• Joined threads are created using pthread_join() function

• Detached threads do not need to be explicitly terminated

• Joined threads must be explicitly terminated using pthread_exit() or return statement

• Detached threads are useful for tasks that do not need to communicate wit...read more

Command to list currently running threads in linux

• Use the 'ps' command with the 'H' option to display threads in a hierarchy

• Use the 'top' command to display threads in real-time

• Use the 'htop' command for an interactive display of threads

Range based map iteration can be done using a for-each loop or iterators.

• Use a for-each loop to iterate over the map elements.

• Alternatively, use iterators to traverse the map.

• The range-based for loop is preferred for its simplicity and readability.

• Example: for(auto const& [key, value] : myMap) { //do something with key and value }

Composite model in Power BI allows combining DirectQuery and Import data sources in a single report.

• Composite model enables users to create relationships between tables from different data sources.

• DirectQuery tables are connected to the data source in real-time, while Import tables are loaded into memory.

• Users can create measures and calculations across both DirectQuery and Import tables in the same report.

• Composite model provides flexibility and performance optimization for ...read more

Name mangling is a technique used by compilers to give unique names to functions and variables to avoid naming conflicts.

• Name mangling is used in C++ to support function overloading.

• It is also used in Python to avoid naming conflicts in modules.

• Name mangling can make it difficult to access variables and functions from outside the class in which they are defined.

• In C++, name mangling can be seen by using the 'nm' command on the compiled object file.

Java is a high-level programming language known for its portability, security, and versatility.

• Java is an object-oriented language, meaning it focuses on objects and classes.

• It is platform-independent, allowing programs to run on any device with a Java Virtual Machine (JVM).

• Java is used for developing a wide range of applications, from web and mobile apps to enterprise systems.

• It is known for its strong security features, making it a popular choice for sensitive applications....read more

SQL is a programming language used for managing and manipulating relational databases.

• SQL stands for Structured Query Language

• It is used to communicate with databases to retrieve, insert, update, and delete data

• Common SQL commands include SELECT, INSERT, UPDATE, DELETE

• Example: SELECT * FROM Customers WHERE Country='USA';

Structure refers to the arrangement of parts in an object or system.

• Structure defines how components are organized and interact with each other

• It provides a framework for the object or system to function properly

• Examples include the skeletal structure of a building, the organizational structure of a company, or the molecular structure of a compound

A union is a data structure that allows storing different data types in the same memory location.

• Unions in C/C++ are similar to structures but all members share the same memory location.

• Only one member of a union can be accessed at a time.

• Unions are useful when you need to store different types of data in the same memory space.