Time
3 hours 28 minutes
Difficulty
Intermediate
CEU/CPE
4

Video Description

DNS, HTTP & HTTPS When it comes to domain protocols services, DNS, HTTP and HTTPS (the "s" designates secure) are tools network protocol type services that work in harmony with each other. DNS runs over port 53 and is both TCP and UDP just to refresh it looks up FQDN and translates to or from its IP address which is language the computer understands. HTTP, stands for Hypertext Transfer Protocol. It runs over port 80, interprets HTML (hypertext markup language), which defines how web browsers such as IE and Chrome define and communicate with web servers which is all in "clear text." As we mentioned earlier, clear text means an unsecured transactional environment. We'll also explain what's called a GET command, how it works, how the HTTP language is read and results display the web page visitors see and how the browser interprets the HTML code commands to present content, and other components such as display of images, pointers to interactive resources such as files stored on an FTP server or dialog boxes or web forms requiring input, as well as how navigations points to other locations are controlled within and beyond the web page itself. HTTPS is Secure HTTP which is a closed, encrypted, secure environment. It runs over port 443, we'll explains how it provides a significantly heightened level of security and what issues can occur that reinforce best practice for keeping security updates and patches current.

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Domain Name Servers (DNS) are the Internet's equivalent of a phone book. They maintain a directory of domain names and translate them to Internet Protocol (IP) addresses

Instructed By

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Anthony Harris
Systems Analyst and Administrator at SAIC
Instructor