PhonePe Site Reliability Engineer Interview Questions, Process, and Tips

Had some basic SQL, Networking and Linux multiple choice questions along with two paragraphs at the end

Q1. Linux Command to List CPU's in the system
Ans. 
Command to list CPUs in Linux system
• Use the 'lscpu' command to list detailed information about CPUs

• Use the 'nproc' command to display the number of processing units available

• Use the 'cat /proc/cpuinfo' command to view information about each CPU core
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Q2. How to copy contents of a file to another file?
Ans. 
To copy contents of a file to another file, you can use file handling methods in programming languages.
• Open the source file in read mode and the destination file in write mode

• Read the contents of the source file and write them to the destination file

• Close both files after the copying process is complete
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Q3. How to rename a file
Ans. 
To rename a file, use the 'mv' command in the terminal or use a file manager with a rename option.
• In the terminal, use the 'mv' command followed by the current file name and the new file name.

• Example: mv oldfile.txt newfile.txt

• In a file manager, right-click on the file and select the 'Rename' option.

• Enter the new file name and press Enter.
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Q4. Why I used specific technologies in my Projects
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Q5. Command to check free disk space
Ans. 
Command to check free disk space
• Use the 'df' command to check free disk space

• The '-h' option displays the output in human-readable format

• The '-T' option shows the filesystem type

• The '-x' option excludes specific filesystem types

• The '-t' option filters the output based on filesystem type
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Q1. Explain OSI Model
Ans. 
The OSI Model is a conceptual framework that standardizes the functions of a communication system into seven layers.
• The OSI Model stands for Open Systems Interconnection Model.

• It was developed by the International Organization for Standardization (ISO) in 1984.

• The model is divided into seven layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Each layer has a specific function and in...read more
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Q2. Difference between NoSQL and SQL
Ans. 
NoSQL is a non-relational database that provides flexible schema and horizontal scalability, while SQL is a relational database with structured schema and vertical scalability.
• NoSQL databases are schema-less and can handle unstructured data.

• SQL databases use structured query language and have predefined schemas.

• NoSQL databases are horizontally scalable, allowing for easy distribution of data across multiple servers.

• SQL...read more
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Q3. Command to check free memory space
Ans. 
Command to check free memory space
• Use the 'free' command to check free memory space

• The 'free' command displays the total, used, and free memory space in the system

• It also shows the amount of memory used for buffers and cache

• The 'free' command can be used with options like '-h' for human-readable output
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Q4. Copy files to a remote machine
Ans. 
To copy files to a remote machine, use a file transfer protocol like SCP or SFTP.
• Use SCP (Secure Copy) command to copy files between local and remote machines

• Example: scp /path/to/local/file username@remote:/path/to/destination

• Use SFTP (Secure File Transfer Protocol) for interactive file transfers

• Example: sftp username@remote, then use put command to upload files
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