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The BSCI exam and CCNP accreditation requires that you be well versed in the basic principles of Ip Address Version 6, or IPv6. If you should be a new comer to IPv6, you'll quickly learn it is nearly just two more octets slapped onto an IPv4 handle! IPv6 addresses are very long, but there are two methods to acceptably limit IPv6 address expression. To get that all-important knowledge of IPv6, turn into a CCNP, and pass the BSCI exam, you have surely got to understand these different methods of expressing an IPv6 address. My last IPv6 training mentioned zero compression; today we'll have a look at major zero pressure.

Leading zero retention allows us to shed the leading zeroes out of every subject in the target. Where we will only use zero compression once in a IPv6 address expression, major zero compression can be utilized as frequently as is appropriate. The key with leading zero pressure is that there should be at least one number left in each field, even if that remaining number is really a zero.

You often see books or internet sites refer to leading zero retention as "dropping zeroes and replacing them with a, but that explanation could be a little complicated, since the blocks are separated with a colon to begin with. You are not really changing the leading zeroes, you're dropping them.

Let's look at an example of leading zero pressure. Taking the address 1234:0000:1234:0000:1234:0000:1234:0123, we've four different fields that have leading zeroes. The target might be written out because it is, or drop the key zeroes.

Unique format: 1234:0000:1234:0000:1234:0000:0123:1234

With leading zero compression: 1234:0:1234:0:1234:0:123:1234

There's not a problem with using zero compression and primary zero compression in exactly the same address, as shown here:

Unique format: 1111:0000:0000:1234:0011:0022:0033:0044

With zero and leading zero compression: 1111::1234:11:22:33:44

Zero compression uses the double-colon to restore the 2nd and third block of numbers, which were all zeroes; leading zero compression replaced the "00" at the beginning of each of the final four blocks. Just be careful and take your time with both zero compression and top zero compression and you'll do well on the examination and in real life. The keys to success here are remembering that you can only use zero compression once in a single target, and that while leading zero compression can be properly used as frequently as required, one or more number should remain in each industry, even if that number is a zero. ankle braces