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from typing import Optional


class NetOps:
    @staticmethod
    def link_up(interface: str):
        pass

    @staticmethod
    def link_down(interface: str):
        pass

    @staticmethod
    def add_route(
        interface: str,
        route: str,
        *,
        gateway: Optional[str] = None,
        source_address: Optional[str] = None
    ):
        pass

    @staticmethod
    def append_route(interface: str, address: str, gateway: str):
        pass

    @staticmethod
    def del_route(
        interface: str,
        address: str,
        *,