https://joshua-david-s-school.teachable.com/blog/194466/switch-vs-router-vs-firewall
http://www.theotaku.com/worlds/telecom/view/347401/what_are_the_differences%3A_switch%2C_router%2C_and_firewall%3F/
http://crweworld.com/usa/ny/new-york/localnews/tech/1347420/what-are-the-differences-switch-router-and-firewall
https://www.seo-top-agencies.gq/what-is-sd-wan-velocloud/
https://thegioisim.us/what-is-sd-wan-velocloud/
https://www.bombagiu.it/what-qualifications-do-you-need-to-be-a-network-engineer/
techyaari.com/2019/12/what-is-sd-wan-velocloud.html
https://tecnohacks.com/computer-science-vs-software-engineering/
http://freespaceway.com/jackmaxwell/2019/12/12/computer-science-vs-software-engineering-career-outlook/
https://www.onlinesharings.com/linux-system-administrator-career-outlook/
https://gosmithers.com/2019/12/11/best-network-certificates-for-network-administrators/
https://thegioisim.us/all-you-need-to-know-about-cisco-certified-partners-network/
https://www.townplannersdiary.com/best-network-certificates-for-network-administrators/
