90
Chapter 3
IP Addressing
F I G U R E 3 . 6
Discontiguous networking example
In the VLSM section of this chapter, we discussed how route summariza-
tion in discontiguous networks could cause some hosts to become unreach-
able, as we saw in Figure 3.4. If both RouterA and RouterB are sending out
advertisements to the WAN cloud advertising that they are the path to net-
work 172.16.0.0/16, then devices in the WAN cloud will not know which
advertisement to believe.
Hierarchical Adressing
10.1.0.0/16
10.1.2.8/30
10.1.2.4/30
10.1.1.8/30
10.1.1.4/30
10.1.1.0/24
10.1.2.0/24
Non-Hierarchical Adressing
10.1.0.0/16
10.1.2.8/30
10.1.2.4/30
10.3.0.0/16
172.16.2.0/24
172.16.1.0/24
10.2.0.0/16
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