Thus more VLAN means more broadcast domain with less devices. VLANs enhance the network security. In a typical layer 2 network, all users can see all devices by default. Any user can see network broadcast and responds to it. Users can access any network resources located on that specific network. Users could join a workgroup by just attaching their system in existing switch. This could create real trouble on security platform. Properly configured VLANs gives us total control over each port and users.
With VLANs, you can control the users from gaining unwanted access over the resources. Device management is easier with VLANs. Since VLANs are a logical approach, a device can be located anywhere in the switched network and still belong to the same broadcast domain.
We can move a user from one switch to another switch in same network while keeping his original VLAN. For example our company has a five story building and a single layer two network. The only limitation we have is that device when moved, must still be connected to the same layer 2 network. VLANs allow us to group the users by their function instead of their geographic locations. Switches maintain the integrity of your VLANs. Users will see only what they are supposed to see regardless what their physical locations are.
With default configuration, all computers share same broadcast domain. Development department can access the administration or production department resources. With VLAN we could create logical boundaries over the physical network.
Assume that we created three VLANs for our network and assigned them to the related computers. Physically we changed nothing but logically we grouped devices according to their function. These groups [VLANs] need router to communicate with each other.
Logically our network look likes following diagram. With the help of VLAN, we have separated our single network in three small networks. These networks do not share broadcast with each other improving network performance. VLAN also enhances the security.
Now Development department cannot access the Administration and Production department directly. Different VLAN can communicate only via Router where we can configure wild range of security options. Assigning VLANs statically is the most common and secure method. It is pretty easy to set up and supervise.
In this method we manually assign VLAN to switch port. Static method is the most secure method also. As any switch port that we have assigned a VLAN will keep this association always unless we manually change it.
It works really well in a networking environment where any user movement within the network needs to be controlled. In dynamic method, VLANs are assigned to port automatically depending on the connected device. In this method we have configure one switch from network as a server. This information is mapped with VLAN. Only high end switch can configured as VMPS.
Dynamic VLANs supports plug and play movability. For example if we move a PC from one port to another port, new switch port will automatically be configured to the VLAN which the user belongs. In static method we have to do this process manually. Access link connection is the connection where switch port is connected with a device that has a standardized Ethernet NIC. Access link connection can only be assigned with single VLAN.
That means all devices connected to this port will be in same broadcast domain. Very well written article, helped me understand better what static testing is, because after the lecture about testing, I still felt confused.
Thank you very much :. Thanks for sharing such great information. Software Testing Class. STC Admin December 21, What is Static Testing? Could you please tell me the difference between functional testing and system testing? Thanks to the team , regards gabby Reply. Thank you very much : Reply. Spell checking in web page comes under static testing or dynamic testing.
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