72. How DNS is Works | DNS Working Process | DNS Practical | CCNA 200-301 Full Course in Hindi
1. **Domain Name Resolution Request**: When you type a domain name into your web browser, your device initiates a DNS query to find the corresponding IP address for that domain.
2. **Local DNS Cache Check**: Your device first checks its local DNS cache to see if it has recently resolved the domain name. If it finds a matching entry, it uses the associated IP address without needing to query external DNS servers.
3. **DNS Recursive Resolver**: If the domain name is not found in the local cache, your device sends a request to a DNS recursive resolver. This resolver is typically provided by your Internet Service Provider (ISP) or configured manually.
4. **Root DNS Servers**: If the resolver doesn't have the IP address for the requested domain in its cache, it queries the root DNS servers. These servers maintain information about the authoritative DNS servers for top-level domains (TLDs) like .com, .net, .org, etc.
5. **TLD DNS Servers**: The root DNS servers direct the resolver to the appropriate TLD DNS servers based on the domain's extension (e.g., .com). The TLD servers provide information about the authoritative name servers for the specific domain.
6. **Authoritative Name Servers**: The resolver then queries the authoritative name servers identified by the TLD servers. These authoritative servers hold the actual DNS records (such as A records for IPv4 addresses, AAAA records for IPv6 addresses, MX records for mail servers, etc.) for the requested domain.
7. **Response Transmission**: The authoritative name servers respond to the resolver with the requested DNS records, including the IP address associated with the domain name.
8. **Cache Update**: The resolver caches the DNS records it received for future use and returns the IP address to the requesting device.
9. **Connection Establishment**: With the IP address obtained from DNS resolution, your device establishes a connection to the appropriate server hosting the website or service associated with the domain name.
Practical Applications:
**Website Access**: DNS enables users to access websites using domain names instead of remembering complex IP addresses.
**Email Delivery**: DNS is essential for routing emails by resolving mail server domain names to IP addresses.
**Load Balancing**: DNS can be used for distributing incoming traffic across multiple servers by configuring multiple IP addresses for a single domain name.
**Failover**: DNS can facilitate failover mechanisms by directing traffic to backup servers in case of primary server failures.
Cisco Router
Switch
Firewall
Putty
Best CCNA Videos
CCNA Videos in Hindi
How to Access Cisco Devices
How to Use Putty
200-301
200-301 Full Course
Networking
About Router
About Switch
Cisco CCNA
CCNP
CCIE
CCNA Security
CCNP Security
CCIE Security
Network Fundamental
Cyber Security
Full Cyber Security Course
Craw Security
Network Automation
Why We Need Networking
CCNA Hindi
CCNA Videos in Short
About Cisco Router in Short
CCNA Short
CCNP Short
CRAW
#ccna #ccnp #ccie #cisco #networksecurity #firewall #networksecurity #dns #telnet #sshorts
#networking #switch #best #ciscopackettracer #routing #dns #dhcp #router #switch #putty
*******************************************
Find Us On:
Telegram:- https://t.me/joinchat/GFZL9xel7jTspUK...
Discord: / discord
Facebook: / crawsec
Instagram: / crawsec
LinkedIn: linkedin.com/in/Crawsec
Twitter: / crawsec
Discord: / discord
****************************************
Connect With Cybersecurity Expert Mohit Yadav On:-
Website: http://www.mohityadav.com
Instagram:- / mohityadavc. .
Facebook:- / mohityadavcraw
LinkedIn:- / mohit-yadav