Cisco WAN :: Management And BITS Ports On ASR1002

We recently purchased a Cisco ASR1002 router with four on-board Gigabit SFP-style Ethernet ports. However, when I do a "show ip interface brief", I see that there's an extra Gigabit Ethernet port. See the last interface in the following output:
 
ASR_1002_router#sh ip int b
Interface                         IP-Address       OK?     Method Status          Protocol
GigabitEthernet0/0/0       unassigned      YES  manual     down                down

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On the router itself, in addition to the four Ethernet SFP ports, there are four additional RJ-45 ports. They're labeled "BITS", "MGMT", "CON", and "AUX". I know what the Con and Aux ports are, but what are the Bits and Mgmt ports? And is one of them the Gigabit Ethernet interface that I see listed at the bottom of the output? And if it is, is there anything special about it, or is it just another routed Ethernet port? Can I do something special with it, like out-of-line managment?