CN-09: Website kaise khulti hai?

✅ Seedha Jawab

Website aapke phone mein nahi, door kisi server (hamesha chalu rehne wala computer) pe rakhi hoti hai. Aap naam likhte ho, toh browser pehle DNS (internet ki phonebook) se us naam ka IP address poochhta hai, phir us address wale server se “yeh page do” ki request bhejta hai. Server page ki files (HTML, design, photos) bhejta hai, aur browser unhe jodkar page aapki screen pe bana deta hai.

🏠 Khud Karke Dekho: Website ka Safar Pakdo

Bhaag 1 (phone ya computer ke browser mein, bade ki permission se):

Bhaag 2 (code se DNS ki diary): CharuMam AI Tutor kholo: tutor.charumam.com → 🐍 Python → Practice Karo tab. Yeh code type karo aur Run dabao:

# internet ki "phonebook": website ka naam -> uska IP address (sab example numbers)
phonebook = {"charumam.com": "203.0.113.25", "school.example": "198.51.100.7"}
# phone ki apni chhoti diary (cache), shuru mein khaali
cache = {}
# jin websites ko kholna hai, unki list (charumam.com do baar)
kholna = ["charumam.com", "school.example", "charumam.com", "galat-naam.xyz"]
# har naam ek-ek karke dhoondho
for naam in kholna:
    # pehle apni diary (cache) mein dekho
    if naam in cache:
        # diary mein mil gaya, bahar poochhne ki zaroorat nahi
        print(naam, "-> diary se mila:", cache[naam])
    # diary mein nahi, toh badi phonebook (DNS) se poochho
    elif naam in phonebook:
        # phonebook se address lo
        ip = phonebook[naam]
        # agli baar ke liye diary mein likh lo
        cache[naam] = ip
        # batao ki DNS se mila
        print(naam, "-> DNS se mila:", ip)
    # kahin nahi mila
    else:
        # browser yahi bolta hai: site nahi mili
        print(naam, "-> address nahi mila! Site can't be reached")

Output aayega:

charumam.com -> DNS se mila: 203.0.113.25
school.example -> DNS se mila: 198.51.100.7
charumam.com -> diary se mila: 203.0.113.25
galat-naam.xyz -> address nahi mila! Site can't be reached

Kya seekha: pehli baar naam DNS se mila, doosri baar wahi naam diary (cache) se turant mil gaya, aur galat naam ka koi pata hi nahi mila. (Yeh asli DNS nahi, sirf samajhne ka ek khel hai; IP numbers bhi sirf example hain.)

Ab aap: kholna list mein “school.example” ek baar aur jodo aur dekho kahan se mila. Phir phonebook mein apna ek naya naam aur example number jodo.