The Domain Name System, or DNS, allows people to use easily recognizable names in place of IP addresses. DNS works as a network service that operates over UDP port 53. Every time you connect to a network, that network provides your computer with the IP address of a local DNS server that it can use to lookup IP addresses. In this video, learn how DNS functions.
- [Instructor] Computers use IP addresses…to communicate over the network,…but those addresses are very difficult…for people to remember.…Just imagine if you had to memorize the IP address…of every single web server…that you need to access in a given day.…The Domain Name Service, or DNS,…allows people to use easily recognizable names…in place of IP addresses,…and DNS servers translate those names.…A DNS server can translate a name…that you're more familiar with, such as www.lynda.com,…into the IP addresses that computers use to communicate,…such as 184.108.40.206.…
DNS works as a network service…that operates over UDP port 53.…Every time you connect to a network,…that network provides your computer with the IP address…of a local DNS server that it can use…to look up IP addresses.…Then, whenever you type the domain name…of a website into your browser,…your computer sends a request to the local DNS server,…asking it for the IP address associated with that name.…If the server knows the answer to your question,…it simply responds to the request with the IP address,…
Note: This course is part of a series releasing throughout 2018. A completed learning path of the series will be available once all the courses are released.
- How IP addresses are assigned and managed
- Multilayer protocols
- VPNs and VPN concentrators
- Designing secure networks
- Firewall management techniques
- Maintaining network availability
- Software defined networking (SDN)
- Port isolation
- Network attacks
- How Wi-Fi networks function
- WPA, WPS, and propagation attacks
- Host-based network security control
Skill Level Advanced
Insights from a Cybersecurity Professionalwith Mike Chapple32m 15s Appropriate for all
1. TCP/IP Networking
2. Network Security Devices
3. Designing Secure Networks
4. Specialized Networking
5. Secure Network Management
6. Virtualized Networks
Port isolation1m 47s
7. Network Attacks
8. Transport Encryption
9. Wireless Networking
10. Host Security
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