References
http://www.ciscopress.com/store/ccna-200-301-portable-command-guide-9780135937822
https://www.mouser.com
https://dl.acm.org/citation.cfm?id=1207049
https://www.cisco.com/c/en/us/td/docs/ios/fundamentals/command/reference/cf_book.pdf
https://www.scribd.com/document/21011643/IP-Subnet-Cheatsheet
https://www.slideshare.net/minariyahi5/chapter-3-52210471
https://www.academia.edu/34123026/Introduction_to_TCP_IP
http://ijssst.info/Vol-17/No-33/paper13.pdf