________ are rules that exist at several levels in a telecommunication connection.

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**Solution:**

1. In telecommunication, **protocols** are defined as a set of rules that govern communication between devices.

2. These rules exist at several levels of the OSI model, ensuring proper formatting, transmission, and reception of data.

3. Other options like Bandwidth (capacity of a channel), Network Surface Unit (not a standard term), and Domain Name (addressing system) do not represent rules governing communication.

**Answer:** Protocol

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