7.6. Exam Essentials

Remember the Class A range

The IP range for a Class A network is 1–126. This provides 8 bits of network addressing and 24 bits of host addressing by default.

Remember the Class B range

The IP range for a Class B network is 128–191. Class B addressing provides 16 bits of network addressing and 16 bits of host addressing by default.

Remember the Class C range

The IP range for a Class C network is 192–223. Class C addressing provides 24 bits of network addressing and 8 bits of host addressing by default.

Remember the Private IP ranges

The Class A private address range is 10.0.0.0 through 10.255.255.255.

The Class B private address range is 172.16.0.0 through 172.31.255.255.

The Class C private address range is 192.168.0.0 through 192.168.255.255.

Understand why we need IPv6

Without IPv6, the world would soon be depleted of IP addresses.

Understand link-local

Link-local is like an IPv4 private IP address, but it can't be routed at all, not even in your organization.

Understand unique local

This, like link-local, is like private IP addresses in IPv4 and cannot be routed to the Internet. However, the difference between link-local and unique local is that unique local can be routed within your organization or company.

Remember IPv6 addressing

IPv6 addressing is not like IPv4 addressing. IPv6 addressing has much more address space and is 128 bits long, represented in hexadecimal, unlike IPv4, which is only 32 bits long and represented in decimals.