Is A VLAN like a office building with many offices? Each office can contain people talking to one and other? The people in each office cannot talk to people in other offices? Each office has a door that leads to another shared door out of the office building and into the office building. In special situations a door might exist that leads to a shared office . The shared office contains copy machine that may be used by different offices? In the case of the shared copy machine office and the office building door the people walking in and out cannot see each other?