After the sequence is completed, opening a port may be accomplished by the host-based firewall, but could also be implemented by custom software.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request. ### Instruction: List the MITRE techniques contained in the text. ### Input: After the sequence is completed, opening a port may be accomplished by the host-based firewall, but could also be implemented by custom software. ### Response: T1205.