A bridge reads the
outermost section of data on the data packet, to tell where the message is
going. It reduces the traffic on other network segments, since it does not send
all packets. Bridges can be programmed to reject packets from particular
networks. Bridging occurs at the data link layer of the OSI model, which means
the bridge cannot read IP addresses, but only the outermost hardware address of
the packet. In our case the bridge can read the ethernet data which gives the
hardware address of the destination address, not the IP address. Bridges forward
all broadcast messages. Only a special bridge called a translation bridge will
allow two networks of different architectures to be connected. Bridges do not
normally allow connection of networks with different architectures. The
hardware address is also called the MAC (media access control) address. To
determine the network segment a MAC address belongs to, bridges use one of:
- Transparent Bridging - They build a table of addresses
(bridging table) as they receive packets. If the address is not in the
bridging table, the packet is forwarded to all segments other than the one
it came from. This type of bridge is used on ethernet networks.
- Source route bridging - The source computer provides
path information inside the packet. This is used on Token Ring networks.
1 Comments
Lets start study today itself to clear Dec-2015 Exam.
Watch all the videos and practice according to that..
https://www.youtube.com/watch?v=JvyHALnYd-s&list=PLSn1xGWWiEkHYChd8OIKfZrnEhzFDxlgt