Bridge operate on data link layer
HTML is read by a browser and a browser works at the Application Layer.
Bridges and switches operate at the same OSI layer - layer 2. That means they switch packets based on the destination MAC address. A switch is sometimes called a multi-port bridge.A bridge has 2 ports, whereas a switch can have many more than that.
According to this old link ( www.window.state.tx.us/tpr/btm/btmtr/tr13.html ) with 1991 figures, it cost $1.2 million per year to operate the ferry and it would cost over $88 million to build a bridge. The document does not say that it is technically impossible to build a bridge, but it does mention that there would be a minimum height requirement due to the tall ship traffic.
The West Gate Bridge is a cable-stayed bridge.
The Chelsea Bridge is a suspension bridge. Similar to the Golden Gate Bridge in San Francisco.
Routers operate at layer 3. LAN switches operate at layer 2. Ethernet hubs operate at layer 1.
A Switch is a Layer 2 device as they operate in the data link layer
Hubs are a physical layer (layer 1) device; most switches operate at the Data Link layer (Layer 2) of the OSI model.
The Transport Layer
Data Link Layer
Hubs and repeaters operate at the Physical Layer of the OSI Model. The Physical Layer is the first layer of the OSI Model.
Layer 2 of the OSI model, the Data Link Layer is composed of two sublayers, the lower being the MAC layer that regulates how computers access information on a network and transmit it. A bridge connects two networks, or two sections of a LAN, and works at the Data Link Layer to regulate it.
2
Layer 3
Session Layer - layer 5Transport Layer - layer 4
1. Repeaters (Operate at the OSI Physical Layer).2. Bridges (Operate at the OSI Data Link Layer).3. Routers {and Brouters} (Operate at the OSI Network Layer).
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