By Stephen Bucaro
A network switch operates at layer 2, the data link layer of the OSI
model. It records the MAC (Media Access Control) addresses of the devices attached
to its ports. When a frame is received intended for a device connected to one of
its ports, it sends that frame only to that device, thereby reducing network traffic.
A multilayer switch also works at layer 3, the network layer of the
OSI model. That's why a multilayer switch is sometimes called a layer 3 switch.
At layer 3, data is encapsulated into packets containing the destination IP
address. This allows the switch to also perform routing between subnets, which further
optimizes network traffic.
The term multilayer means the switch operates at multiple layers of the OSI
Model. Today there are multilayer switches that use information in layer 4 segments and
protocol data units all the way up to layer 6 of the OSI model.
More Networking Topologies Articles:
• Understanding Basic Terms in Indoor Fiber Optic Cable Installation
• What is an Ethernet Bridge?
• Network Interface Cards (NIC)
• Distance Vector vs. Link State vs. Hybrid Routing
• Wireless or Wired Network?
• What is an Ethernet Switch?
• How to Set up a Private Network
• MPO Connector, MTP Connector, What's the Difference?
• Transparent Bridging and MAC Address Filtering
• What Are Fiber Optic Attenuators?