46.Which of the following statement about the physical layer protocol is true? a.The physical layer provides the mechanism for opening, closing and managing a session between end-user application processes. b.The physical layer changes the value of a bit being transmitted due to electromagnetic interference c.The physical layer specifies the shared protocols and interface methods used by hosts in a communication network d. The physical layer uses the port number to deliver traffic.

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VLAN

VLAN stands for Virtual Local Area Network, and it is created from one or more local area networks. A Virtual Local Area Network (VLAN) is a customized network made up of one or more LANs. It allows a set of devices from different networks to be converted into a single logical network. As a result, a virtual LAN that is managed similarly to a physical LAN emerges.