To create a VLAN, an Ethernet switch can be configured to group ports into numbered VLANs. For example, when packets arrive on port #9 (VLAN #1), the switch can push those packets through all other ports belonging to VLAN #1, and only those ports. This simple, static approach is known as port-based VLAN.
Business casual is an ambiguously-defined dress code that has been adopted by many professional and white-collar workplaces in Western countries. It entails neat yet informal attire and is generally more casual than informal business attire but more formal than casual or smart casual attire.
business casual typically means a sport coat collared shirt of less formal pattern or fabric with trousers if you are gonna ignore this suggestion than at least do yourself a favor wear a polo tshirt in a plain color no stripes and absolutely no logos you are not a walking billboard for your shirt maker