District of Columbia. In addition, some address space should be reserved in the event that Blue
River goes international. Peter wonders if this is a good time to implement NAT.
the state level. Why is it important to have an addressing plan?
scheme for headquarters and the three regional offices located in Alabama.
the state level. Why is it important to have an addressing plan?
assigning blocks of addresses to each state.
addresses to portions of the network, addressing and administration are greatly simplified. This
hierarchical addressing results in very efficient summarization of routes throughout the
network. This method should simply address administration and a scalable network. If the
routing protocols used at Blue River use variable-length subnet masking, a true hierarchical
addressing can be deployed. A 16-bit mask can be used at the core of the network backbone. A
24-bit mask can be used at the access layer for each state. If necessary, the network can be
subdivided even further if business requirements dictate.
would include allocating and documenting IP addresses and subnets in a network. IP addressing
standards should define subnet size and subnet assignment. Recommending IP address
management standards for Blue River minimizes the potential for overlapping or duplicate
subnets, nonsummarization in the network, duplicate IP address device assignments, and
wasted IP address space. See Figure 5-9.