Doorbell Ringer/Chime: The sounding device that produces a ring, or chime or other type of sound when someone pushes the doorbell button. Some have a different ring/chime pattern depending on if the front or back door button is pushed.
All used ports are associated with VLANs distinct from VLAN 1 and distinct from the black hole VLAN. It is also a good practice to shut down unused switch ports to prevent unauthorized access. A good security practice is to separate management and user data traffic. The management VLAN, which is VLAN 1 by default, should be changed to a separate, distinct VLAN. To communicate remotely with a Cisco switch for management purposes, the switch must have an IP address configured on the management VLAN.
WLAN - Wireless Local Area Networking Explained. A wireless local area network (WLAN) provides wireless network communication over short distances using radio or infrared signals instead of traditional network cabling. A WLAN is a type of local area network (LAN). A WLAN can be built using any of several different wireless network protocols, most commonly either Wi-Fi or Bluetooth.