ipv6 on ccna 802?

mmreed

Ok, not lookign for any NDA violations,

but to what degree is IPv6 explored for the exam?

The CCNA 802 topics are pretty broad and ciscos site says:

Describe the technological requirements for running IPv6 in conjunction with IPv4 (including: protocols, dual stack, tunneling, etc).
Describe IPv6 addresses


so does that mean I need to know how to configure an IPv6 address, just know what the basic theory is of it, or what? Not sure how far indepth I need to study IPv6 and dont want to spent alot of time on it yet since v6 is a whole different world than what Im used to - having a hard time grasping the no subnet mask and no broadcasting,etc...

dtlokee

The offical courseware has topics on IPv6 basics, such as address format and the need for IPv6 and so on. Configuring IPv6 addresses on router interfaces, Enabling Static routes, RIPng, and OSPF v 3.

Who knows what to what extent Cisco will test on these, but they're in the courseware so it could be on the exam.

mmreed

dtlokee wrote:

The offical courseware has topics on IPv6 basics, such as address format and the need for IPv6 and so on. Configuring IPv6 addresses on router interfaces, Enabling Static routes, RIPng, and OSPF v 3.

Who knows what to what extent Cisco will test on these, but they're in the courseware so it could be on the exam.

eewww so the 802 courseware gos that indepth with v6 to the point of actually setting up routing for it? ouch.

Maybe I will take the 801 exam instead. or just hope if I mess those up on 802, I have the other areas covered enough to pass me.

Ipv6 is giving me a very tough time. I just cant seem to grasp it in terms of no netmask or broadcast etc...

dtlokee

Actually the scheme for addressing is pretty simple. There is a netmask but it is "always" going to be a /64. I say always but that can change, the standard says /64

Basically a registry will give an allocation of /32 to an ISP, who will in turn sub allocate them to their customers as a /48, this scheme allows a single /32 to be "subnetted" into 65534 allocations to the customers at /48, the customer will then create all of it's subnets using the prefix from the provider as /64 subents (giving each customer 65534 subnets as well). The remainder of the address is the host part, which is created from the MAC address usinf the EUI-64 format.

So a host address will look like this:

|<------ ISP ------>|<--- Customer --->|<----- Subnet -----|<----- Host ----->|
|   32 bits         |     16 Bits      |      16 Bits      |      64 Bits     |

Now the way the EUI-64 address is created is a bit confusing, it takes a 48 bit MAC address splits it in half and inserts the value "FFFE" to pad it to 64 bits. It also sets the 7th bit from the left (MSB) of the address to "1" in binary.

take the address 000c.09FA.1234

1.Split it in half and insert FFFE

000C.09FF.FEFA.1234

2. Set the 7th bit from the left to "1"

020C.09FF.FEFA.1234

That would become the host portion for this computer. Microsoft being forward thinking about security (yeah it made me chuckle too) randomizes this process so the address will not remain the same all the time. This is to prevent an IPv6 address from being used as a permanent tracking cookie for your computer. You may find that your Windows based PC doesn't provide a predictable address, that is how it was intended.