Join Greg Sowell for an in-depth discussion in this video DNS and NetBIOS, part of Foundations of Networking: Protocols and CLI Tools.
- [Voiceover] The Domain Name System…is what translates your favorite domain names…into IP addresses.…It was first designed at the University…of California Irvine in 1983.…It is designed to be a hierarchical distributed system.…It's capable of translating the massive amounts…of requests required by the internet…or within a small private network.…If a client wants to resolve google.com,…it will first check its DNS cache.…If it does have it cached, it will simply use that address.…If it does not, it will begin the lookup process.…
To do a name resolution,…an admin must first specify which DNS service…to use on their client's machines.…When a host does a lookup,…it will send a UDP packet to port 53…on the DNS server asking for resolution…of a domain name.…If the DNS server has the entry cached,…it will send back a response containing the IP.…If it does not, it will consult its root hints file.…This file is a mapping of some of the root servers to IPs.…
Since I am looking for google.com,…my server will first make a request to a root server.…
Protocols are the lifeblood of modern communication. By the end of this course, you'll know what you need to troubleshoot any network connection and keep the communication flowing.
Note: This course maps to domain 3 of the MTA Networking Fundamentals exam.
- The role of protocols in networking
- Port addresses
- ARP and InARP
- DNS and NetBIOS
- HTTP and HTTPS
- Mail protocols
- Using command-line tools to troubleshoot protocols and routing