Cisco Ccnp Bsci Exam Tutorial A Guide To Ipv6 Addressing

Cisco CCNP / BSCI Exam Tutorial: a​ Guide To Ipv6 Addressing
Learning IPv6 is​ paramount in​ your efforts to​ pass the BSCI exam and go on to​ earn your CCNP, and it's going to​ help in​ your real-world networking career as​ well .​
IPv6 can be confusing at​ first, but it's like anything else in​ Cisco or​ networking as​ a​ whole - learn one part at​ a​ time, master the fundamentals, and you're on your way to​ success .​
In today's article we're going to​ take a​ look at​ IPv6 address types.
In IPv4, a​ unicast address is​ simply an​ address used to​ represent a​ single host, where multicast addresses represent a​ group of​ hosts and broadcasts represent all hosts .​
In IPv6, it's not quite that simple .​
There are actually different types of​ unicast addresses, each with its own separate function .​
This allows IPv6 to​ get data where it's supposed to​ go quicker than IPv4 while conserving router resources.
IPv6 offers two kinds of​ local addresses, link-local and site-local .​
Site-local addresses allow devices in​ the same organization, or​ site, to​ exchange data .​
Site-local addresses are IPv6's equivalent to​ IPv4's private address classes, since hosts using them are able to​ communicate with each other throughout the organization, but these addresses cannot be used to​ reach Internet hosts.
Site-local and link-local addresses are actually derived from a​ host's MAC address .​
Therefore, if​ HostA has HostB's IPv6 address, HostA can determine HostB's MAC address from that, making ARP unnecessary.
Link-local addresses have a​ smaller scope than site-local .​
Link-local addresses are just that, local to​ a​ physical link .​
These particular addresses are not used at​ all in​ forwarding data .​
One use for these addresses is​ Neighbor Discovery, which is​ IPv6's answer to​ ARP.
You can identify these and other IPv6 addresses by their initial bits:
001 - Global address
(first 96 bits set to​ zero) - IPv4-compatible address
1111 1111 – Multicast
1111 1110 11 - Site local
1111 1110 10 - Link Local
As a​ future CCNP, you're more than familiar with the reserved IPv4 address classes .​
You also know that they're not exactly contiguous .​
The developers of​ IPv6 took a​ structured approach to​ IPv6 reserved addresses - any address that begins with 0000 0000 is​ an​ IPv6 reserved address .​
One of​ these is​ the IPv6 loopback address, and this will give you some practice with your zero compression!
IP v6 Loopback: 0000:0000:0000:0000:0000:0000:0000:0001
Using Leading Zero Compression Only: 0:0:0:0:0:0:0:1
Combining Leading Zero and Zero Compression: ::1
Zero compression looks pretty good now, doesn't it? You just have to​ get used to​ it​ and keep the rules in​ mind .​
You can use all the leading zero compression you want, but zero compression (double-colon) can only be used once in​ a​ single address.
IPv6 is​ here to​ stay, not only on your BSCI and CCNP exams, but in​ the real world as​ well .​
Learning it​ now will not only aid you in​ passing your Cisco exams, but in​ supporting IPv6 in​ the future.

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