::1/128 is the loopback address.::/128 is the unspecified address.
::IPv4-address/96 are the IPv4-compatible addresses.
The 2001:db8::/32 are the documentation addresses. They are used
for documentation purposes such as user manuals, RFCs, and so on.
::/0 is the default unicast route address.
ff00::/8 are multicast addresses.This section of the book is certain to grow as time passes and IPv6 becomes
more commonly used. For now, this introduction is probably all you are likely
to need, especially since IPv4 is not going away. This transition is a process
of adding IPv6 into existing worldwide networking schemes and system
abilities and is neither intended nor likely to completely replace IPv4.
Network Organization
Properly organizing your network addressing process grows more difficult as
the size of your network grows. Setting up network addressing for a Class C
network with fewer than 254 devices is simple. Setting up addressing for a
large, worldwide company with a Class A network and many different users
can be extremely complex. If your company has fewer than 254 hosts
(meaning any device that requires an IP address, including computers,
printers, routers, switches, and other devices) and all your workgroups can
share information, a single Class C network is sufficient.
Subnetting
Within Class A and B networks, there can be separate networks called
subnets. Subnets are considered part of the host portion of an address for
network class definitions. For example, in the 128. Class B network, you can
have one computer with address 128.10.10.10 and another with address
128.10.200.20; these computers are on the same network (128.10.), but they
have different subnets (128.10.10. and 128.10.200.). Because of this,
communication between the two computers requires either a router or a
switch. Subnets can be helpful for separating workgroups within a company.
Often subnets can be used to separate workgroups that have no real need to
interact with or to shield from other groups’ information passing among
members of a specific workgroup. For example, if your company is large