As a CCNA/CCNP applicant you are envisioned to understand IPv6
For the duration of your job as a Cisco network engineer you will have to deal knowing IPv6 address composition.
For your CCNA and CCNP reports you have to at some stage confront and realize IPv6. At 1st glance it can see fairly challenging in comparison to IPv4 that we are all employed to, in real truth IPv6 is fairly a just addressing protocol as soon as you get previous the first shock. In ccnp training london are going to have a look at Neighbour discovery protocol for layer 2 mapping.
When an IPv6 host or router wants to deliver a packet to some other host on the exact same network it will initial of all appear into it truly is very own regional neighbour database to discover if it has an IPv6 to MAC mapping, if it finds the appropriate mapping the host will use it, if there is no mapping the host will want to take care of the recognized layer three IPv6 deal with to a at the moment unfamiliar Layer two MAC handle and to do this the host employs the Neighbor Discovery Protocol or NDP to learn the MAC deal with dynamically.
The Sending host will use a multicast concept called a Neighbor Solicitation (NS) icmp information to request the obtaining host for it's MAC tackle, the getting host will reply with a Neighbor Ad (NA) icmp message unicast in return with the asked for MAC deal with.
How IPv6 achieves this is all in the building of the Neighbor Solicitation information which makes use of a special IPv6 destination address named a "Solicited Node Multicast", this solicited Node Multicast at any provided second represented all of the IPv6 hosts on the link, the last 24 bits of the Solicited Node Handle are the very last 24 bits of the IPv6 address of the device that a host is requesting the MAC from.
The IPv6 multicast location handle is FF02::1:FF:/104 the final 24 bits are made up of the very last 24 bits of the IPv6 deal with to which the concept is currently being despatched to. For illustration if a host needed to uncover the MAC address of an IPv6 host dealt with as 2222:3333:4444:5555:6666:AAAA:BBBB:CCCC:DDDD/64 then the solicited Node Tackle will seem like the pursuing FF02::one:FF:CC:DDDD/104
When a sending hosts wants to get the MAC deal with from the IPv6 host of 2222:3333:4444:5555:6666:AAAA:BBBB:CCCC:DDDD/sixty four it will consider the very last 24 bits of the known IPv6 deal with and spot them into the remaining 24 bits of the Solicited Node Address and since all IPv6 hosts pay attention to their possess Solicited Node addresses, when they listen to their deal with they will reply with the MAC address.