How microservices communicate with each other and how to handle fault tolerance?

PRIOR KNOWLEDGE ON SPRINGBOOT MICROSERVICES REQUIRED
Based on below papers we have to write systematic Research paper .
Add these questions in paper
Q1 : what are the factors to be noted while creating microservices?
Q2 : How microservices communicate with each other and how to handle fault tolerance?
Q3 : Challenges in Authenticating and Authorizing microservices?
Papers as below:
https://ieeexplore.ieee.org/document/9780516
https://ieeexplore.ieee.org/document/8786337
https://ieeexplore.ieee.org/document/9730757
https://ieeexplore.ieee.org/document/9865835/
https://ieeexplore.ieee.org/document/8400214
https://ieeexplore.ieee.org/document/9935022
https://ieeexplore.ieee.org/document/8354426
https://ieeexplore.ieee.org/document/9872665
https://ieeexplore.ieee.org/document/8744776
https://ieeexplore.ieee.org/document/9497188
https://ieeexplore.ieee.org/document/9992918
https://ieeexplore.ieee.org/document/8977061
https://ieeexplore.ieee.org/document/10011206
https://ieeexplore.ieee.org/document/9447352
https://ieeexplore.ieee.org/document/8359144
https://ieeexplore.ieee.org/document/8540763
https://ieeexplore.ieee.org/document/9362656
Note: As per the document attached need Side headings and proper content : Introduction, Systemtic review with Questions as above, conclusion etc… Every content should be from above mentioned papers only

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