Cognizant Senior Engineer Interview Questions and Answers

Q1. How to create the IP sec tunnel?
Ans. 
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 d...read more
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Q2. How to troubleshoot the IP sec tunnel?
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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
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Q1. How ssl vpn it will be working for the remote location?
Ans. 
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 use
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Q2. How to configure the IP sec tunnel for 3 different location and explain the traffic traffic flow and how it will be work?
Ans. 
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
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Q1. How to upgrade to the palaalto firewall and fortigate?
Ans. 
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 dur...read more
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Q2. The both locations IP sec tunnel are down. How to troubleshoot the issue.
Ans. 
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 serv
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Ai interview backend microservices core java

Q1. Microservice architecture spring boot
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Q2. Rest api implementation and communication
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Q1. What is spring boot
Ans. 
Spring Boot is a Java-based framework used for creating standalone, production-grade Spring-based applications.
• Spring Boot simplifies the process of creating Spring applications by providing a set of default configurations.

• It allows for easy setup of Spring projects with minimal configuration.

• Spring Boot includes embedded servers like Tomcat, Jetty, or Undertow, making it easy to deploy applications.

• It provides product...read more
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Q2. What is serialisation
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Serialisation is the process of converting an object into a stream of bytes to store or transmit data.
• Serialisation is used to save the state of an object and recreate it when needed.

• It allows objects to be converted into a format that can be easily stored or transmitted.

• Common examples include JSON, XML, and binary serialisation.

• Serialisation is important for data persistence and inter-process communication.
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