Do not understand the slogan, but also dare to write in the resume proficient in TCP protocol?
Hey! Brothers!
When the resume says "proficient in TCP / IP," I always ask him: what is the port?
Every time I saw a CV saying "familiar with network protocols," I would throw out a soul-searching question: "Why doesn't the URL show up in the URL when the browser enters the URL? " Network engineers who can fully explain port mechanisms are rarer than pandas.
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The port's status as a quagmire 01
In the programmer's world, these numbers are like a code:
· 3306 = Connection location for MySQL Digital Library
· 6379 = Redis Cache's Nest
· 8080 = default position for Tomcat
· 22 = Encrypted channel for SSH
But the real king will always be the golden pair of 80 and 443.
access https://www.baidu.com/ The browser slipped in port 443, just as a secret agent always uses a code.
The Unspoken Rule of Ignoring Ports 02
You think you can access a website without passing a port number?Too young！The protocol already helped you with the choice question:
· HTTP Protocol → Auto Match Port 80
· HTTPS Protocol → Default Recognition of Port 443
If you use the Chrome Developer Kit, you'll see that the browser automatically fills in the port numbers like a secret agent.
Port: The number of a door in the Internet world 03
Imagine you're sending a courier to an overseas Internet user:
· The IP address is the recipient's city
· The tagline is GPS coordinates down to the room number.
Without a port is like writing only "Mr. Wang of Beijing," and the delivery boy can only doubt life at the Forbidden City gate with the package in his arms. The Nginx, MySQL, Redis and other processes on the server all rely on the slogan to find their own quick delivery package.
The Love Story of Protocols and Ports 04
This is the CP fetter than you think:
· TCP80 port: HTTP
· UDP53 port: DNS
· Full dual-service 443 port: HTTPS
Interestingly, the TCP and UDP ports are like parallel world twins - Room 80 has two completely different tenants, HTTP (TCP layer) and QUIC (UDP layer).
Death guide for changing port numbers 05
While you can theoretically set up ports at will, the consequences of messing up are magical:
· Change MySQL to Port 80 → Your Digital Library Suddenly Starts to Receive Internet Users
· Redis Switches to Port 443 → Hackers Think They Have Found Cryptographic Treasure
· Web services with 6666 port → user access to the first jump God
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