Final answer:
A network bridge connects multiple network segments, operates at Layer 2 of the OSI model, and filters and forwards traffic based on MAC addresses. It does not typically provide wireless connectivity or allow communication between different network protocols.
Step-by-step explanation:
A network bridge is a device that connects multiple network segments at the data link layer (Layer 2) of the OSI model. Its primary function is to filter and forward traffic between the connected segments of a network. Let's address each point in the question:
- Connects two or more network segments - This is one of the fundamental purposes of a network bridge. It allows for the expansion of a network by linking separate segments.
- Operates at the data link layer of the OSI model - A bridge works at Layer 2, which means it can understand and use MAC addresses to decide where to forward packets.
- Filters and forwards network traffic based on MAC addresses - By inspecting the MAC addresses in data packets, a bridge can determine whether to forward a packet to another segment or block it, thereby reducing unnecessary traffic and improving network efficiency.
- Provides wireless connectivity to devices - This is not a typical function of a network bridge. Wireless connectivity is usually provided by devices like wireless access points or routers.
- Allows communication between different network protocols - A network bridge works with the same network protocol across all segments since its operations are based on MAC addresses, not network protocols.