background image
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, then devices in the WAN cloud will not know which
advertisement to believe.
Hierarchical Adressing
Non-Hierarchical Adressing
Copyright ©2001 SYBEX , Inc., Alameda, CA