====== Bringing Interfaces Up/Down ======
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Two methods can be used to bring interfaces up or down.
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==== Using "ip" ====
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From the command line, use:
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    ip link set dev <interface> up
    ip link set dev <interface> down
    
    Example:
    ip link set dev eth0 up
    ip link set dev eth0 down
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==== Using "ifconfig" ====
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From the command line, use: 
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    /sbin/ifconfig <interface> up
    /sbin/ifconfig <interface> down
    
    Example:
    /sbin/ifconfig eth0 up
    /sbin/ifconfig eth0 down
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