|
The Destination Address is a 12 symbol code that indicates which station the frame is destined to. Each station has a unique 12 symbol address that identifies it. When a station receives a frame, it compares the DA of that frame to its own address. If the two match, the station will copy the contents of the frame into its buffers. A frame can also be intended for more than one station using group addressing. The first bit transmitted in the destination address is an indicator of whether the address is an individual address, or a group address. If the first bit is set (1), the address is a group address. If it is not set (0), the address is an individual address. Group addresses can be used to address a frame to multiple destination stations. A broadcast address is a special type of group address which applies to all of the stations on the network. In this address, all of the bits are set to one, so the broadcast address is 12 'F' symbols. Addresses can either be locally or universally administered. If the addresses are universally administered, then the first 6 symbols of the address is the manufacturer's OUI. Each manufacturer is assigned a unique OUI to use for all of its products. The last 6 symbols of the address differentiate between stations with the same manufacturer. In a universally administered addressed network, each station comes with a default address that it is to use. In a locally administered addressing scheme, a network manager sets the address for each of the stations. The second bit transmitted is the indicator of whether the address is a universal or a local address. A set bit (1) means a locally administered address, while an unset bit (0) is a universally administered address.
Click on green areas for more detail. |
