Networking with Cisco

I was sorting up a bit on my drive when I noticed some old files I had laying around from when I did the CCNA and CCNP certifications.

Here are obviously the things that I cared about learning for testing in CCNP 1, please have in mind that I knew some things better than other, so I did not write down the things that I already did know.

BGP-based routing allows for policy decisions to made for an AS.
BGP allows an AS to send traffic to a neighboring AS, intending that the traffic take a different route than from the
traffic originating in the neighboring AS.

IS-IS:
IS-IS keywords: CLNS,
show clns route, will show IS-IS level 2 routing table

PDU types:
Hello
LSP
CSNP
PSNP

IS-IS Level 1 routers use LSPs for building a topology database of the local area only.

OSPF:
224.0.0.5       All -> DR
224.0.0.6       DR  -> ALL

You need to redistribute between the different routing protocols but you are concerned about routing loops.
What step should you take help avoid routing loops?
Answer: MANUALLY DEFINE A DEFAULT METRIC

IPv6:
FF80::/8 == MULTICAST
FE80::/8 == LOCAL
2001/3ffe/2002::/8 == 6bone (this is now depreciated, 3ffe is NO LONGER IN USE)

ip-helper
Per default 3 UDP ports; SNMP (161), TFTP (69), TACACS (49)