Ibm Websphere Application Server, Websphere Middleware Admin

 Amazon offer a variety of certificate exam. which are categorized by roles and expertise level of candidate. 1. Foundation Level - this is called Aws certified cloud practitioner. where it validates basic of aws cloud knowledge. Exam duration:- 90 minutes Cost: $100, 2, Associate Level Exam duration:- 130 minutes Cost: $150, 3.Professional Level Exam duration:- 180 minutes Cost: $300, 4, Specialty Certifications Exam duration:- 170-180 minutes Cost: $300,

 Tomcat is a Catalina container, or is a servlet container that support or execute the servlet and java server page (JSP) and it is light weight web-server most suitable to host small or simple applications. TomcatEE - TomcatEE is a extended version of tomcat. which support full java EE features. it also includes additional  technologies like EJB(enterprise java beans), Java Transaction API JTA,CDI  TomcatEE support microservices this act as an application server where tomcat run as web server.

 In Linux there is command called lsof using this command. user can find which process is associated with any port. and this command always help to resolve  port-conflict issue in server Example:  let suppose tomcat one instance is running with 8080 port and there is more instance created later but user forgot to change the default port. then newly create tomcat instance will try to start in same port 8080. in such case user can identified which process is using that port. Example:- lsof -i:8080

 In Linux and Unix there is one program or command called "cd" which stand for change directory. we can compare this cd with windows double click. Example :-   cd /opt/ABC/ /opt/ABC is the path where user want to enter. or user can go first /opt then go to ABC cd /opt  press enter cd ABC press enter.