https://yukar.icu/tags/computer-network/Recent content in Computer Network on Yukari's BlogHugozh-cnFri, 24 Jul 2026 00:00:00 +0000https://yukar.icu/posts/cs/5layerarchitecture/Thu, 23 Jul 2026 00:00:00 +0000https://yukar.icu/posts/cs/5layerarchitecture/Architecture of Computer Network.https://yukar.icu/posts/cs/computernetwork/Mon, 20 Jul 2026 00:00:00 +0000https://yukar.icu/posts/cs/computernetwork/<p>A network is</p> $$\text{Network}=\text{Nodes}+\text{Links}+\text{Protocols},$$<p>logical 逻辑上（transparent）</p> <p>physical 实现</p> <hr> <p>Remember that </p> $$\text{Computer Network}=\text{Protocol Stack}+\text{Addressing}+\text{Routing},$$<p> base on which we build the Internet to connect everything.</p> <h1 id="architecture--layering">Architecture &amp; Layering</h1> <p>The <strong>network architecture</strong>, equivalently, the <strong>protocol stack</strong>, organizes communication into layers, each providing services to the layer above while hiding implementation details from the layer below.</p> <p>A simple example is the <strong>OSI model</strong>, which partitions the communication process into seven layers: </p> $$\text{Physical}\to\text{Data Link}\to\text{Network}\to\text{Transport}\to\text{Session}\to\text{Presentation}\to\text{Application}.$$<p> The OSI model provides a conceptual framework; it does not define specific protocols. Now consider the <strong>TCP/IP model</strong>, which condenses these into four layers: </p>