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Guilherme Mazui

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What is the Difference Between VLAN and Subnet?

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Subnet and VLAN are two important concepts for managing a computer network. The main difference between them is that subnets are used to logically divide a network into smaller parts, while VLANs (Virtual Local Area Networks) are used to segregate different users or groups of users on the same physical network. Here are the key differences between VLAN and subnet:

  • Layer: VLAN operates at Layer 2 (Data Link Layer) of the OSI model, while subnet operates at Layer 3 (Network Layer).
  • Functionality: Subnets are created using routers and separate networks physically, while VLANs separate networks virtually.
  • Cost-effectiveness: Subnets are more cost-effective than VLANs, as they require fewer resources to set up and maintain. However, they may not provide the same level of security as VLANs.
  • Security: VLANs offer greater control over who can access different parts of the network, providing better security compared to subnets.
  • Traffic management: VLANs can reduce broadcast traffic and make it easier to control broadcast domains, improving the overall performance of a network.

In summary, subnets and VLANs are both used to segment a network, but they serve different purposes and operate at different layers of the OSI model. Subnets are more cost-effective and physically separate networks, while VLANs provide better security and virtually segregate networks. Both technologies can be used together to enhance the performance and security of a network.

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  • What is the Difference Between VLAN and Subnet?
  • Comparative Table: VLAN vs Subnet

    • Comparative Table: VLAN vs Subnet

    Here is a table comparing the differences between VLANs and subnets:

    Parameter VLAN Subnet
    Definition A VLAN (Virtual Local Area Network) is a logical local area network that contains broadcasts within itself and only hosts that are part of that VLAN can communicate with each other. A subnet (subnetwork) is a logical division of an IP network, where a group of IP addresses is allocated to a portion of the network.
    Layer VLAN operates at Layer 2 (Data Link Layer) of the OSI Model, where MAC addresses are used. Subnet operates at Layer 3 (Network Layer) of the OSI Model, where IP addresses are used.
    Network Member Control In VLANs, the network to which a host belongs is decided by the interface to which it is connected (layer 2 port of the switch to which the host is connected). In subnets, the network to which a host belongs is decided by the IP address assigned to the host (layer 3).
    IP Subnet Assignment VLANs can have multiple subnets, but it is generally recommended to have a 1:1 mapping of subnets and VLANs, i.e., one subnet per VLAN. Subnets are created by borrowing a portion of the IP address space and dividing it into smaller networks.
    Communication Devices within the same VLAN can communicate without the need for routing, but communication between different VLANs requires a router or layer 3 switch. Devices within the same subnet can communicate directly, while communication between different subnets requires a router or other layer 3 device.

    In summary, VLANs and subnets are both used to segment networks, but they operate at different layers of the OSI Model and serve different purposes. VLANs are used to create isolated networks within a single physical network, while subnets are used to create logical networks through the same physical network.

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    Guilherme Mazui

    Guilherme Mazui is graduated in journalism from the Federal University of Minas Gerais (UFMG) and a master's degree in Communication from the University of São Paulo (USP). In addition, he has experience in advertising writing and has worked as a content editor in several companies.