In an IEEE 802.5 token ring network, which component houses the internal switching and connects stations in a star-wired ring topology?

Introduction / Context:
Token ring (IEEE 802.5) physically uses a star-wired topology but logically forms a ring. Understanding the central device that internally relays the token and data frames helps distinguish token ring from Ethernet hubs/switches.

Given Data / Assumptions:

• Token ring uses a Multistation Access Unit (MAU).
• Stations connect to the MAU and are inserted into or bypassed from the ring.
• The MAU is not an Ethernet switch; it maintains ring continuity.

Concept / Approach:

A MAU (or MSAU) provides the physical wiring concentration and the internal relays to pass the token from one port to the next, creating the logical ring. NICs reside in hosts; transceivers/connector types are passive/physical and do not implement the ring logic.

Step-by-Step Solution:

Verification / Alternative check:

Vendor literature for 802.5 shows MAU ports with lobe cables to stations; the MAU manages insertion and wrap-around when a station is offline.

Why Other Options Are Wrong:

Transceiver: Media interface only; does not form the ring.

Nine-pin connector: A connector type, not a concentrator device.

NIC: Host interface; not the hub of the ring.

None of the above: Incorrect because MAU is correct.

Common Pitfalls:

Confusing token ring MAUs with Ethernet hubs/switches; their operation and purpose differ.

Final Answer:

MAU