Questions:
    python arguments
        f(p1, p2, p3, kw1=3, kw2=4) -- invoke
        def f(a) -- either
        def f(a=1) -- either, but optional
        def f(a, /) -- must be positional
        def f(*, a) -- must be keyword
        def f(*args) -- will get any leftover position
        def f(**args) -- will get any leftover keywords

    what does a router do (IP, etc)
        connectes you to a local area network
        gateway: connects LAN to Internet
    DHCP
        gets me an IP address from the router
    
    multithreading vs multiprocessing
        process = app or daemon (usually)
        thread = one workflow in app
        every process has at least one thread
    what is a thread
    how are threads and sockets related
        they aren't
        thread: allows multiple concurrent paths in code
        socket: talk to other processes/machines
    threads and networking TCP/IP
    
    what does join mean
        mythread.join() will
            1. wait for mythread to finish
            2. clean up the thread's resources
    
    what are daemons
        usually: background processes helping a system
        sometimes: running with no supervision
    no-preemption vs hold-and-wait
        no preemption: hold until I release
        hold and wait: hold one while wating for another
    deadlock in mp6
    dining philosphers -- when simultaneous?