tagged,tagged端口和untagged端口的區別
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Introduction
When it comes to networking, understanding the differences between tagged and untagged ports is crucial. These terms may seem complicated for a beginner, but once you grasp the basics, you"ll find it easy to configure and manage your network.
What Are Tagged and Untagged Ports?
To put it simply, a tagged port sends and receives data packets that are labeled with a VLAN tag, while an untagged port doesn"t add such tags to its packets. All VLANs need to have at least one untagged port, which is also called an access port, to enable end devices to communicate with each other and with the network.
The Differences Between Tagged and Untagged Ports
The most significant difference between tagged and untagged ports is that tagged ports allow for multiple VLANs to be carried over a single network cable, whereas untagged ports only carry one VLAN. In other words, an untagged port can only be a member of one VLAN, while a tagged port can be a member of multiple VLANs simultaneously.
Advantages of Tagged Ports
- Flexibility: Tagged ports allow for the creation of separate VLANs for different departments or users while using the same physical network infrastructure.
- Traffic segregation: With tagged ports, network administrators can isolate different types of traffic such as voice, data, and video to improve network performance and security.
- Scalability: Tagged ports make it possible to scale the network smoothly without the need for additional physical cabling.
Advantages of Untagged Ports
Untagged ports are usually found at the edge of a network and are used to connect end devices such as computers, phones, and printers. Advantages of using untagged ports include:
- Simplicity: End devices don"t require an understanding of VLAN tagging to communicate with the network.
- Reduced configuration complexity: In small networks, the lack of need for VLAN tagging simplifies the network configuration process.
- Cost-effective: VLAN tagging requires more expensive network equipment, making untagged ports a cost-effective solution for small networks.
How Tagged and Untagged Ports Work Together
To enable communication between a tagged and an untagged port, a process called VLAN tagging must occur. In this process, the network traffic from the untagged port is tagged with a VLAN identifier. This allows switches and routers to understand which VLAN the traffic belongs to and route it to the correct VLANs or hosts.
Conclusion
In conclusion, understanding tagged and untagged ports is essential for network administrators, as it enables them to create and manage VLANs effectively. By using a combination of tagged and untagged ports, network administrators can optimize network performance and security based on their specific needs.
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tagged,tagged端口和untagged端口的區別
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