7 million
Bridge operate on data link layer
2
Ozone layer break because of CFC's. they react with ozone and break it.
Pennies are coated with a thin layer of copper to prevent corrosion and oxidation of the underlying zinc core. The copper coating gives pennies their characteristic reddish-brown color.
A network bridge connects multiple network segments at the data link layer (Layer 2) of the OSI model.
Layer 2 (Data Link Layer) http://compnetworking.about.com/cs/internetworking/g/bldef_bridge.htm
Baking soda reacts with the copper surface of the pennies, causing them to form a blue/greenish copper oxide layer. This chemical reaction changes the surface of the pennies, giving them a blue appearance.
No. Hub works only on first layer. On second layer only swithc/bridge works on second layer of OSI model.
bridge is designed for use between LANs that use identical protocols for the physcial and link layer.
CFCs
no there's none but u can predict it by looking at its color.
You will need a router. Token Ring and Ethernet refer to two different layer two protocols. You will need a layer three device to encapsulate the data for communication between the two networks. A bridge refers to a layer two device.