______ is a passage to connect two networks that may work on different networking models.

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**Solution:**

1. A **gateway** is a network device that connects two different networks which may operate on different networking models or protocols. It acts as a translator and passage between these networks.

2. A **router** connects multiple networks but generally works within the same networking model and directs data packets between them.

3. A **switch** connects multiple devices within a single network and manages data traffic efficiently within that network.

4. A **hub** is a basic device that connects multiple devices but broadcasts data to all ports, making it less efficient.

Therefore, the correct answer is **Gateway** as it specifically connects networks that may use different networking models.

**Answer:** Gateway

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