您可能听说过也可能没有听说过VLAN（虚拟局域网^{(Virtual Local Area Network)}）。它主要用于世界各地的大型企业。如果您有兴趣开设需要VLAN^(VLANs)的业务，则需要了解更多信息。不仅如此，如果您对CCNA感兴趣，那么您肯定需要了解VLAN的全部内容。但不用担心，我们在本文中提供了您需要的所有信息。

什么是 VLAN？

从本质上讲，VLAN是由多个局域网创建的自定义网络。如果在多个网络上启用了多个设备，则可以将它们组合成一个逻辑网络。这种组合的结果是一个虚拟LAN，其管理方式与物理LAN类似。

在没有VLAN的情况下，从单个主机发送的任何广播都可以到达所有网络设备，而不是首选设备。这是一个问题，因为它会增加CPU工作量，进而导致整个网络速度变慢，并将安全性降低到最低限度。

为什么我们使用 VLAN？

• 降低安全风险：^{(Reduction of security risks:)}当谈到降低安全风险时，VLAN通过减少可以接收交换机可能泛滥的帧副本的主机数量来做到这一点。
• 提高安全性：^{(Improve security:)}为了提高安全性，您可以将具有敏感信息的主机保留在单独的VLAN上。
• 创建网络更改：^{(Create network changes:)}通过将端口配置到合适的VLAN中，您可以轻松实现网络更改。
• 增加广播域：^{(Increase broadcast domains:)}如果您想在减小广播域大小的同时增加广播域的数量，那么最好的选择是使用VLAN。
• 提高灵活性：^{(Improved flexibility:)}VLAN不必创建按物理位置对用户进行分组的网络设计，而是通过对部门中的用户进行分组来更灵活地设计网络。

如何配置 VLAN

现在，在虚拟局域网^{(Local Area Network)}方面，您应该知道一些事情。例如，交换机上的所有端口都位于VLAN 1中。如果您想验证这一点，请在交换机的IOS启用模式下键入show vlan命令。

在创建VLAN并将交换机端口分配给该VLAN方面，您必须遵循两个关键步骤：

首先，使用vlan NUMBER全局命令创建 VLAN

将交换机分配给端口时，您必须使用两个 interface 子命令。第一个是access命令，第二个是switch port access vlan NUMBER命令。

第一个命令是关于指定接口是可访问的，而第二个命令旨在将接口分配给VLAN。

使用VLAN^(VLANs)的主要好处是什么？

虚拟局域网是^{(Virtual Local Area Network)}局域网^{(Local Area Network)}中系统的虚拟划分。VLAN允许您执行强大的安全策略，帮助网络管理和广播域的限制，减少广播流量等。

阅读^(READ)：  Lanshark 是用于局域网的免费 P2P 文件共享工具。

What is VLAN? Why do we use VLANs?

You may or may not have heard of VLAN (Virtual Local Area Network). It is something that is primarily used in large businesses around the world. If you are interested in opening a business that requires VLANs, you will need to learn more about it. Not only that, if you are interested in CCNA, then you will definitely need to understand what VLAN is all about. But worry not, we have all the information you’ll need in this article.

What is VLAN?

In essence, VLAN is a custom network created from multiple local area networks. If several devices are enabled on multiple networks, they can be combined to create one logical network. The result of this combination becomes a Virtual LAN that is administered in a similar manner to a physical LAN.

Without the presence of a VLAN, any broadcast sent from a single host can reach all network devices instead of the preferred one. This is a problem because it can increase CPU workload, which in turn causes a slow down of your overall network and reduces security to the bare minimum.

Why do we use VLANs?

• Reduction of security risks: When it comes down to reducing security risks, VLAN does this by lowering the number of hosts that can receive copies of frames the switches can flood.
• Improve security: In order to improve security, you can keep hosts with sensitive information on a separate VLAN.
• Create network changes: By configuring a port into the suitable VLAN, you can achieve network changes with ease.
• Increase broadcast domains: If you want to grow the number of broadcast domains while decreasing their size, then your best bet is to use VLAN.
• Improved flexibility: Instead of having to create network designs that group users by physical locations, VLAN makes it possible for a more flexible move to design networks by grouping users in departments.

How to configure VLAN

Now, in terms of conjuring a Virtual Local Area Network, you should know a few things. For example, all ports on a switch are located in VLAN 1. If you want to verify this, please type show vlan command from the IOS enable mode of a switch.

In terms of creating a VLAN and assigning a switch port to that VLAN, there are two key steps you must follow:

First, create a VLAN by using the vlan NUMBER global command

When assigning a switch to a port, you must use the two interface subcommands. The first is, access command, while the second is, switch port access vlan NUMBER command.

The first command is all about specifying that the interface is accessible, while the second is designed to assign the interface to a VLAN.

What are the primary benefits of using VLANs?

A Virtual Local Area Network is a virtual division of systems in a Local Area Network. VLAN allows you to enforce strong security policies, helps with network administration and confinement of broadcast domains, reduces broadcast traffic, etc.

READ: Lanshark is a free P2P file sharing tool for Local Area Networks.

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