原文:Wireshark TCP 层 - CCNA、CCNP重写文本:了解 Wireshark 的 TCP 层 - CCNA、CCNP 学员

The Wireshark capture of TCP layers is like peeling an onion, with each layer revealing a different aspect of the communication process. From the physical layer of bits to the ethernet, network, and transport layers, it’s a deep dive into the inner workings of data transmission. 🧅💻🔍

# Wireshark TCP Layers – CCNA, CCNP

## Introduction 🌐
The given text provides a basic topology for understanding Wireshark TCP layers, demonstrating the connection between a client and a server. The capture is done on gigabit Ethernet 01, and the layers of the TCP/IP model are explored using Wireshark to analyze the traffic.

### Setting Up the Topology 🖥️
The basic topology consists of a client connected to a default gateway, which could be a multi-layer switch, and a web application server (web app.com). The different layers of the TCP/IP model are captured and analyzed using Wireshark, starting from the physical layer to the application layer.

## Starting the Trace 🔍
Once the capture is started on gigabit Ethernet 01, the traffic from the client to the server is monitored in Wireshark. The interaction between the client and the server, along with the various TCP segments, is observed to comprehend the functioning of different layers in the TCP/IP model.

#### Capturing the Segments 📶
The captured segments depict the transmission of data from the client (Source IP address) to the server (Destination IP address) through different layers, including the physical, ethernet, network, and transport layers. The source port and destination port are also identified to understand the communication process.

##### Analysing the Layers 📊
The layers of the TCP/IP model are visualized and studied, starting from the physical layer, which is represented by bits, followed by the ethernet, network (IP), and transport (TCP) layers. Each layer’s significance in transmitting and receiving data is highlighted to provide a comprehensive understanding of the network communication process.

## Conclusion 🚀
The demonstration provides a practical insight into Wireshark TCP layers, showcasing the analysis of different layers of the TCP/IP model within a network environment. Understanding the functioning of each layer is crucial for network administrators and professionals pursuing certifications such as CCNA and CCNP.

### 主要收获 📝
– Wireshark enables in-depth analysis of TCP/IP layers.
– The TCP/IP model comprises the physical, ethernet, network, and transport layers.
– Analyzing network traffic using Wireshark is vital for network troubleshooting and optimization.

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