Answer below questions: 1) What is TCP/IP? (explain) 2) What is network security firewall? 3) What is the purpose of CSS? (explain) 4) What are the different types of CSS declaration? 5) What are the main roles of an Operating System? 6) What is a process and what are the process states? (explain) 7) What is demand paging in memory management? 8) What is round robin CPU scheduling? 9) What is a modem? (explain) 10) What is the purpose of below HTML tags <style>.