Most modern Ethernet LANs use a star topology.

Question

BlackTom AI · Accepted Answer

Topic at hand is Ethernet LAN topology in modern networks.

Firstly, the statement asserts that most modern Ethernet LANs use a star topology. This aligns with how Ethernet is deployed today: end devices connect to centralized network devices like switches, and switches (or bridges) forward traffic between ports, forming a star-like physical layout.

Historically, Ethernet used other topologies such as bus (coax) and, in some older token-passing designs, ring. Those were largely supplanted by switched Ethernet because switches provide dedicated collision domains per port, reduce collisions, improve performance, and simplify network management.

From a conceptual standpoint, the star arrangement means each host has a direct connection to a central device. This central device handles frame forwarding, which minimizes the need for shared transmission space among all devices and is a key reason for the efficiency gains in modern Ethernet deployments.

If we consider potential alternatives (even though none are shown here), a bus topology would imply all devices share a single collision domain on a single coax segment, which leads to performance bottlenecks and is not how current Ethernet is typically implemented. A ring topology would imply a path-based forwarding mechanism like in Token Ring, which has largely been abandoned in favor of switched Ethernet for scalability and simplicity.

In summary, the practical reality in contemporary Ethernet networks is a centralized, switch-based layout that corresponds to a star topology in physical terms, even though the precise internal switching logic may be more complex than a simple star diagram. This reasoning helps explain why the statement is consistent with current Ethernet deployments.

Most modern Ethernet LANs use a star topology.多重下拉选择题

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