References

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Empson, S. (2006). CCNA Self-Study CCNA Portable Command Guide. https://www.pdfdrive.com/ccna-self-study-ccna-portable-command-guide-shinra-inc-main-page-d3667445.html

Empson, S., Gargano, P., & Roth, H. (2015). CCNP Routing and Switching Portable Command Guide. https://www.pdfdrive.com/ccnp-routing-and-switching-portable-command-guide-d56814104.html

OSPF part I. (n.d.). CCNA Blog | Tips and Tutorials. https://www.ccnablog.com/ospf-part-1/

Cisco certified network associate (CCNA). (2020, November 4). Welcome to Computer Institute, The technology training School. https://www.trainus.com/ccna.asp

Cisco CCNA training certification course in Lahore Pakistan - CCNA training course in Lahore. (n.d.). Student Shelter In Computers. https://www.stscomps.com/cisco.htm