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CCNA - CCNP Coaching - IPv6 Addressing
As a CCNA/CCNP applicant you are predicted to understand IPv6

Throughout your profession as a Cisco network engineer you will have to offer comprehension IPv6 deal with construction.

For your CCNA and CCNP reports you have to at some position confront and realize IPv6. At initial look it can see fairly complicated compared to IPv4 that we are all utilised to, in actual fact IPv6 is fairly a just addressing protocol after you get previous the initial shock. In this write-up we are likely to have a look at Neighbour discovery protocol for layer 2 mapping.

When an IPv6 host or router needs to ship a packet to some other host on the very same community it will very first of all seem into it's very own nearby neighbour databases to discover if it has an IPv6 to MAC mapping, if it finds the proper mapping the host will use it, if there is no mapping the host will require to take care of the acknowledged layer 3 IPv6 tackle to a at the moment unfamiliar Layer 2 MAC address and to do this the host employs the Neighbor Discovery Protocol or NDP to find out the MAC deal with dynamically.

The Sending host will use a multicast message known as a Neighbor Solicitation (NS) icmp concept to inquire the getting host for it is MAC deal with, the obtaining host will reply with a Neighbor Ad (NA) icmp concept unicast in return with the requested MAC deal with.

How IPv6 achieves this is all in the design of the Neighbor Solicitation concept which tends to make use of a special IPv6 destination tackle known as a "Solicited Node Multicast", this solicited Node Multicast at any given moment represented all of the IPv6 hosts on the url, the final 24 bits of the Solicited Node Handle are the previous 24 bits of the IPv6 tackle of the gadget that a host is requesting the MAC from.

The IPv6 multicast spot deal with is FF02::one:FF:/104 the ultimate 24 bits are produced up of the final 24 bits of the IPv6 deal with to which the concept is currently being despatched to. For ccnp training london if a host wanted to learn the MAC deal with of an IPv6 host dealt with as 2222:3333:4444:5555:6666:AAAA:BBBB:CCCC:DDDD/sixty four then the solicited Node Deal with will seem like the following FF02::1:FF:CC:DDDD/104

When a sending hosts desires to get the MAC handle from the IPv6 host of 2222:3333:4444:5555:6666:AAAA:BBBB:CCCC:DDDD/sixty four it will get the previous 24 bits of the recognized IPv6 tackle and place them into the remaining 24 bits of the Solicited Node Handle and because all IPv6 hosts hear to their personal Solicited Node addresses, when they hear their deal with they will reply with the MAC tackle.

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