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# nw_protocol_stack_t

An ordered set of protocol options that define the protocols that connections and listeners use.

```
typealias nw_protocol_stack_t = any OS_nw_protocol_stack
```

## Topics

### Modifying Application Protocols

[`nw_protocol_stack_prepend_application_protocol(_:_:)`](/documentation/Network/nw_protocol_stack_prepend_application_protocol(_:_:))

Adds a protocol onto the top of the protocol stack.

[`nw_protocol_stack_clear_application_protocols(_:)`](/documentation/Network/nw_protocol_stack_clear_application_protocols(_:))

Removes all application protocols from the protocol stack.

[`nw_protocol_stack_iterate_application_protocols(_:_:)`](/documentation/Network/nw_protocol_stack_iterate_application_protocols(_:_:))

Iterates through the array of application protocol options that will be used by connections and listeners.

[`nw_protocol_stack_iterate_protocols_block_t`](/documentation/Network/nw_protocol_stack_iterate_protocols_block_t)

A block that allows you to inspect or modify a single protocol’s options.

### Configuring Lower Protocols

[`nw_protocol_stack_copy_transport_protocol(_:)`](/documentation/Network/nw_protocol_stack_copy_transport_protocol(_:))

Accesses the options for the protocol stack’s transport protocol.

[`nw_protocol_stack_set_transport_protocol(_:_:)`](/documentation/Network/nw_protocol_stack_set_transport_protocol(_:_:))

Replaces the protocol stack’s transport protocol with a new set of options.

[`nw_protocol_stack_copy_internet_protocol(_:)`](/documentation/Network/nw_protocol_stack_copy_internet_protocol(_:))

Accesses the protocol stack’s Internet Protocol options.


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