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Chapter 8: SNA Advanced Peer-to-Peer Net... > 8.7: Connection networks - Pg. 213

8.7 Connection networks A connection network is a representation of a shared access transport facility (SATF), enabling dynamic direct connectivity between any pair of link stations attaching to the facility. An example of a shared access transport facility is a local area network (LAN) where two nodes can communicate directly with each other without the need to use a router. In Figure 8-21 there are end nodes and one network node connected to a LAN. If you do not implement a connection network, you have two options. The first option is to define links only from each end node to the network node (the left side of the figure); the second option is to implement a meshed topology by defining links between each pair of nodes (the right side of the figure). The first option requires fewer link definitions (each end node must define only one link to the network node, and the network node must define a link to each end node, resulting in 2*(n-1) link definitions for a network consisting of n nodes); but sessions between any two end nodes must traverse the network node, which can cause performance problems in the network node if there are a large number of nodes on the LAN. The second option requires more link definitions (each node must define links to every other node, resulting in n*(n-1) definitions for a network of n nodes); but