1. Using IP Addressing in the Network Design
Designing and Supporting Computer Networks – Chapter 6

2. Objectives
Describe the use of a hierarchical routing and addressing scheme
Create the IP address and naming scheme to support growth and efficient routing protocol operation
Describe IPv6 implementations and IPv6 to IPv4 interactions
Implement IPv6 on a Cisco device

3. Describe the Use of a Hierarchical Routing and Addressing Scheme
Functions of a hierarchical addressing scheme:
Prevent duplication of addresses
Control access, monitor security and performance
Support modular design and scalability
Graphic: with “with hierarchical addressing” clicked on

4. Describe the Use of a Hierarchical Routing and Addressing Scheme
Poorly-planned IP addressing can result in discontiguous subnets
Routing protocols may display more than one summary route to discontiguous subnets
Manual configuration of routing protocols may be required
Graphic: —run all the way to the end for the explanation of the reachability issue

5. Describe the Use of a Hierarchical Routing and Addressing Scheme
VLSM provides more efficient use of IP address space
VLSM enables routers to summarize routes on classless boundaries
Graphic: with “classless subnetting using VLSM” clicked on

6. Describe the Use of a Hierarchical Routing and Addressing Scheme
CIDR ignores classful boundaries
CIDR enables supernets: VLSMs with shorter prefix lengths than the defaults
Summarization produces leaner routing tables
with “summarized routing table” clicked on

7. Create the IP Address and Naming Scheme
Plan the entire addressing scheme in advance
Allow for significant growth
Support the physical layout, routing, and security
Graphic:

8. Create the IP Address and Naming Scheme
Define the addressing blocks scheme to support summarization
Document locations, VLAN or network type, and number of hosts and networks
Graphic: with IP Network Requirements chart clicked on

9. Create the IP Address and Naming Scheme
Select the appropriate routing protocol to use in the network
Support classless routing and VLSM
Small and infrequent updates to reduce traffic
Fast convergence
Graphic:

10. Create the IP Address and Naming Scheme
Factors in designing the routing strategy:
Load balancing
Authentication
Graphic: run all the way to the end

11. Create the IP Address and Naming Scheme
Determine when and how to summarize address space for efficient routing
Graphic: with “classless route summarization” clicked on

12. Create the IP Address and Naming Scheme
Design an address scheme for an internetwork and assign ranges for hosts, network devices, and the router interface
Graphic: with step 5 button clicked on

13. Create the IP Address and Naming Scheme
Determine an appropriate naming scheme
Use codes and avoid names that easily identify protected resources
Maintain consistency
Document the names
Graphic:

14. Describe IPv6 Implementations and IPv6 to IPv4 Interactions
Enhancements available with IPv6:
Mobility and security
Simpler header
Address formatting
Graphic:

15. Describe IPv6 Implementations and IPv6 to IPv4 Interactions
Common transition methods from IPv4 to IPv6:
Dual stack
Tunneling
Proxying and translation
Graphic:

16. Describe IPv6 Implementations and IPv6 to IPv4 Interactions
How to configure IPv6 on a Cisco device:
Activate IPv6 forwarding
Configure interfaces
Configure name resolution
Graphic:

17. Describe IPv6 Implementations and IPv6 to IPv4 Interactions
RIPng for IPv6:
The tag parameter in interface configuration mode
The ipv6 rip name enable command on directly-connected routers
Graphic:

18. Summary Allocation of IP addresses must be planned and documented.
A properly-designed hierarchical IP addressing scheme makes it easier to perform route summarization.
A complex hierarchy of variable-sized networks can be summarized at various points using a prefix address.
The choice of routing protocol must support the VLSM and summarization strategy.
A good network naming scheme makes the network easier to manage and easier to navigate.
IPv6 addresses are written as a series of eight 16-bit hexadecimal digits separated by colons.