public Builder setNetworkConfig(com.google.cloud.tpu.v2alpha1.NetworkConfig value) {
      if (networkConfigBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        networkConfig_ = value;
      } else {
        networkConfigBuilder_.setMessage(value);
      }
      bitField0_ |= 0x00000040;
      onChanged();
      return this;
    }
<pre>
Network configurations for the TPU node. network_config and network_configs
are mutually exclusive, you can only specify one of them. If both are
specified, an error will be returned.
</pre>

<code>.google.cloud.tpu.v2alpha1.NetworkConfig network_config = 36;</code>
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/Node.java