Cisco CCNP / BSCI Exam Tutorial: Leading Zero Compression
The BSCI exam and CCNP certification requires that you be well versed in the basics of IP Version 6, or IPv6. If you’re new to IPv6, you’ll quickly learn that it’s not exactly just two more octets slapped onto an IPv4 address! IPv6 addresses are quite long, but there are two ways to acceptably shorten IPv6 address expression. To pass the BSCI exam, become a CCNP, and get that all-important understanding of IPv6, you’ve got to understand these different methods of expressing an IPv6 address. My last IPv6 tutorial discussed zero compression; today we’ll take a look at leading zero compression.
Leading zero compression allows us to drop the leading zeroes from every field in the address. Where we could only use zero compression once in an IPv6 address expression, leading zero compression can be used as often as is appropriate. The key with leading zero compression is that there must be at least one number left in each field, even if that remaining number is a zero.
You sometimes see books or websites refer to leading zero compression as “dropping zeroes and...
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