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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>✨ Stop-and-Wait Protocol | The OG Reliable Transmission</title>
<script src="https://cdn.tailwindcss.com"></script>
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</style>
</head>
<body class="gradient-bg min-h-screen font-sans">
<div class="container mx-auto px-4 py-8">
<!-- Header -->
<header class="text-center mb-12">
<h1 class="text-5xl font-bold text-white mb-4">STOP-AND-WAIT PROTOCOL</h1>
<p class="text-xl text-white opacity-90">The OG Reliable Transmission Method 🚀</p>
<div class="mt-6">
<span class="inline-block bg-pink-500 text-white px-4 py-2 rounded-full text-sm font-semibold mr-2 mb-2">#ReliableAF</span>
<span class="inline-block bg-purple-500 text-white px-4 py-2 rounded-full text-sm font-semibold mr-2 mb-2">#NoPacketLeftBehind</span>
<span class="inline-block bg-blue-500 text-white px-4 py-2 rounded-full text-sm font-semibold mr-2 mb-2">#OldButGold</span>
</div>
</header>
<!-- Main Content -->
<div class="flex flex-col lg:flex-row gap-8">
<!-- Theory Section -->
<div class="lg:w-1/2 bg-white bg-opacity-90 rounded-2xl p-6 shadow-xl">
<h2 class="text-3xl font-bold text-purple-600 mb-6 flex items-center">
<i class="fas fa-brain mr-3"></i> The Theory Breakdown
</h2>
<div class="space-y-6">
<div class="bg-purple-50 p-4 rounded-xl">
<h3 class="text-xl font-semibold text-purple-700 mb-2">What's the Vibe? 🧐</h3>
<p class="text-gray-700">
Stop-and-Wait is like that friend who needs confirmation for EVERY message before sending the next one.
"Did you get that?" "Yeah?" "Okay, here's the next one." Basic but reliable AF.
</p>
</div>
<div class="bg-blue-50 p-4 rounded-xl">
<h3 class="text-xl font-semibold text-blue-700 mb-2">How It Works 🛠️</h3>
<ul class="list-disc pl-5 space-y-2 text-gray-700">
<li><span class="font-semibold">Sender:</span> Sends one packet and chills until it gets an ACK (acknowledgement)</li>
<li><span class="font-semibold">Receiver:</span> Gets the packet, sends back an ACK like "Got it, king 👑"</li>
<li><span class="font-semibold">Timeout:</span> If sender doesn't get ACK in time, it resends like "You there??"</li>
</ul>
</div>
<div class="bg-pink-50 p-4 rounded-xl">
<h3 class="text-xl font-semibold text-pink-700 mb-2">Pros vs Cons ⚖️</h3>
<div class="grid grid-cols-1 md:grid-cols-2 gap-4">
<div class="bg-white p-3 rounded-lg shadow">
<h4 class="font-bold text-green-600 mb-1">Pros 👍</h4>
<ul class="list-disc pl-5 text-sm text-gray-700">
<li>Simple AF to implement</li>
<li>Guaranteed delivery (no packet left behind)</li>
<li>No congestion (chill transmission pace)</li>
</ul>
</div>
<div class="bg-white p-3 rounded-lg shadow">
<h4 class="font-bold text-red-600 mb-1">Cons 👎</h4>
<ul class="list-disc pl-5 text-sm text-gray-700">
<li>Slow as molasses (only one packet at a time)</li>
<li>Inefficient for long-distance (high latency = lots of waiting)</li>
<li>ACK could get lost too (double trouble)</li>
</ul>
</div>
</div>
</div>
<div class="bg-yellow-50 p-4 rounded-xl">
<h3 class="text-xl font-semibold text-yellow-700 mb-2">Real-World Tea ☕</h3>
<p class="text-gray-700">
Used in basic communication systems, some IoT devices, and anywhere you need
reliability over speed. Like texting your crush - you wait for a reply before
double-texting, right? (Unless you're desperate 😅)
</p>
</div>
</div>
</div>
<!-- Simulation Section -->
<div class="lg:w-1/2">
<div class="bg-white bg-opacity-90 rounded-2xl p-6 shadow-xl mb-6">
<h2 class="text-3xl font-bold text-blue-600 mb-6 flex items-center">
<i class="fas fa-play-circle mr-3"></i> Live Simulation
</h2>
<div class="flex justify-between items-center mb-6">
<div class="text-center">
<div class="w-16 h-16 bg-red-500 rounded-full flex items-center justify-center mx-auto mb-2">
<i class="fas fa-paper-plane text-white text-2xl"></i>
</div>
<p class="font-semibold">Sender</p>
</div>
<div class="flex-1 h-1 bg-gray-300 mx-4 relative">
<div id="connection-line" class="h-full bg-blue-500 transition-all duration-1000 ease-linear" style="width: 0%"></div>
</div>
<div class="text-center">
<div class="w-16 h-16 bg-green-500 rounded-full flex items-center justify-center mx-auto mb-2">
<i class="fas fa-inbox text-white text-2xl"></i>
</div>
<p class="font-semibold">Receiver</p>
</div>
</div>
<div class="space-y-4" id="simulation-area">
<!-- Messages will appear here -->
</div>
<div class="mt-8 flex flex-wrap gap-3 justify-center">
<button id="start-btn" class="bg-green-500 hover:bg-green-600 text-white px-6 py-3 rounded-full font-bold transition flex items-center">
<i class="fas fa-play mr-2"></i> Start Simulation
</button>
<button id="step-btn" class="bg-blue-500 hover:bg-blue-600 text-white px-6 py-3 rounded-full font-bold transition flex items-center">
<i class="fas fa-step-forward mr-2"></i> Step-by-Step
</button>
<button id="reset-btn" class="bg-gray-500 hover:bg-gray-600 text-white px-6 py-3 rounded-full font-bold transition flex items-center">
<i class="fas fa-redo mr-2"></i> Reset
</button>
</div>
</div>
<!-- Stats Panel -->
<div class="bg-white bg-opacity-90 rounded-2xl p-6 shadow-xl">
<h3 class="text-xl font-bold text-gray-800 mb-4 flex items-center">
<i class="fas fa-chart-bar mr-2"></i> Simulation Stats
</h3>
<div class="grid grid-cols-2 md:grid-cols-4 gap-4 text-center">
<div class="bg-indigo-50 p-3 rounded-lg">
<p class="text-sm text-indigo-600 font-semibold">Packets Sent</p>
<p id="sent-count" class="text-2xl font-bold">0</p>
</div>
<div class="bg-green-50 p-3 rounded-lg">
<p class="text-sm text-green-600 font-semibold">ACKs Received</p>
<p id="ack-count" class="text-2xl font-bold">0</p>
</div>
<div class="bg-yellow-50 p-3 rounded-lg">
<p class="text-sm text-yellow-600 font-semibold">Timeouts</p>
<p id="timeout-count" class="text-2xl font-bold">0</p>
</div>
<div class="bg-red-50 p-3 rounded-lg">
<p class="text-sm text-red-600 font-semibold">Packet Loss</p>
<p id="loss-count" class="text-2xl font-bold">0</p>
</div>
</div>
</div>
</div>
</div>
<!-- FAQ Section -->
<div class="mt-16 bg-white bg-opacity-90 rounded-2xl p-6 shadow-xl">
<h2 class="text-3xl font-bold text-orange-600 mb-6 flex items-center">
<i class="fas fa-question-circle mr-3"></i> FAQs - For the Curious Minds
</h2>
<div class="space-y-4">
<div class="border-b border-gray-200 pb-4">
<button class="faq-btn flex justify-between items-center w-full text-left font-semibold text-lg text-gray-800">
<span>Why not just send all packets at once? 🤔</span>
<i class="fas fa-chevron-down transition-transform"></i>
</button>
<div class="faq-answer mt-2 text-gray-700 hidden">
<p>Because the internet isn't perfect, sis! Packets can get lost, duplicated, or arrive out of order. Stop-and-Wait makes sure each packet is safely delivered before moving to the next one. It's like eating one fry at a time instead of shoving the whole box in your mouth.</p>
</div>
</div>
<div class="border-b border-gray-200 pb-4">
<button class="faq-btn flex justify-between items-center w-full text-left font-semibold text-lg text-gray-800">
<span>What happens if the ACK gets lost? 😱</span>
<i class="fas fa-chevron-down transition-transform"></i>
</button>
<div class="faq-answer mt-2 text-gray-700 hidden">
<p>The sender has a timer! If it doesn't get an ACK within a certain time, it assumes the packet or ACK got lost in the void and resends the packet. This is why we have the timeout counter in the simulation.</p>
</div>
</div>
<div class="border-b border-gray-200 pb-4">
<button class="faq-btn flex justify-between items-center w-full text-left font-semibold text-lg text-gray-800">
<span>Is this still used today? 🕰️</span>
<i class="fas fa-chevron-down transition-transform"></i>
</button>
<div class="faq-answer mt-2 text-gray-700 hidden">
<p>Yes, but mostly in simple systems or where reliability is more important than speed. Modern protocols like TCP use more advanced versions (sliding window) that are like Stop-and-Wait but with multiple packets in transit at once - the glow-up version!</p>
</div>
</div>
<div class="border-b border-gray-200 pb-4">
<button class="faq-btn flex justify-between items-center w-full text-left font-semibold text-lg text-gray-800">
<span>How does this compare to other protocols? 🔄</span>
<i class="fas fa-chevron-down transition-transform"></i>
</button>
<div class="faq-answer mt-2 text-gray-700 hidden">
<p>Stop-and-Wait is the most basic reliable protocol. Others like Go-Back-N and Selective Repeat allow multiple packets in flight, making them more efficient but also more complex. It's like the difference between texting one message at a time vs having a full conversation flow.</p>
</div>
</div>
</div>
</div>
<!-- Footer -->
<footer class="mt-12 text-center text-white text-opacity-80">
<p>Made with <i class="fas fa-heart text-red-400"></i> for network protocol enthusiasts</p>
<p class="mt-2 text-sm">PS: This is way more fun than your textbook explanation, right? 😉</p>
</footer>
</div>
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let sentCount = 0;
let ackCount = 0;
let timeoutCount = 0;
let lossCount = 0;
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<div>
<span class="font-bold text-blue-700">Packet #${sequenceNumber}</span>
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<i class="fas fa-times-circle mr-1"></i> Packet lost in transmission!
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<i class="fas fa-check-circle mr-1"></i> Packet delivered successfully!
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<div class="flex justify-between items-center">
<div>
<span class="font-bold text-purple-700">ACK #${sequenceNumber}</span>
<span class="text-xs text-gray-500 ml-2">For Seq: ${sequenceNumber % 2}</span>
</div>
<div class="text-xs text-gray-500">
${new Date().toLocaleTimeString()}
</div>
</div>
<div class="mt-2 text-sm text-gray-700">
Message: "Got it! Send next packet when ready"
</div>
`;
ack.id = `ack-${sequenceNumber}`;
simulationArea.appendChild(ack);
// Animate connection line back
connectionLine.style.width = '0%';
connectionLine.style.transitionDuration = '1s';
// Randomly decide if ACK will be lost (15% chance)
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setTimeout(() => {
ack.classList.add('bg-red-100', 'border-red-500');
ack.innerHTML += `
<div class="mt-2 text-sm text-red-600 font-semibold">
<i class="fas fa-times-circle mr-1"></i> ACK lost in transmission!
</div>
`;
// Timeout after 3 seconds
setTimeout(() => {
ack.innerHTML += `
<div class="mt-2 text-sm text-yellow-700 font-semibold">
<i class="fas fa-clock mr-1"></i> Timeout! Resending packet...
</div>
`;
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timeoutCountEl.textContent = timeoutCount;
// Resend the packet
setTimeout(sendPacket, 1000);
}, 3000);
}, 1000);
} else {
// ACK arrived successfully
setTimeout(() => {
ack.classList.add('bg-green-100', 'border-green-500');
ack.innerHTML += `
<div class="mt-2 text-sm text-green-600 font-semibold">
<i class="fas fa-check-circle mr-1"></i> ACK received successfully!
</div>
`;
if (isSimulating) {
// Continue simulation
setTimeout(sendPacket, 1000);
}
}, 1000);
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// Event listeners
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startBtn.innerHTML = '<i class="fas fa-pause mr-2"></i> Pause';
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startBtn.classList.add('bg-yellow-500', 'hover:bg-yellow-600');
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startBtn.innerHTML = '<i class="fas fa-play mr-2"></i> Continue';
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stepBtn.addEventListener('click', function() {
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</body>
</html> |