[mod1-07-p2] updated to 2018 class
[mod1-07-p2] updated to 2018 class

* Marked IPv6 transition mechanisms as addendum of the program ("[E]")
* Global Unicast is globally unique and routable
* IPv6 assigned from IANA, to the RIRs and then to the users.
* Smaller than /64 considered harmful
* Subnet-routers are the routers residing in a subnet
* ICMP messages are the basis of the ping utility
* Removed Route Redirection messages, never mentioned in CCNA
* ping and traceroute moved to part 2, expanded discussion

hlcs/advanced-networking,hlcs/advanced-networking