This chapter focus on fault tolerant systems with an emphasis on switching equipment. The paper says in order to be fault-tolerant, the systems needs to be fault-isolated, which means a failure in one part of the system will not effect the whole system. This is achieved in the paper by running each modules in separate processes and the communication between these processes is read-only. This way an error in one process will not infect another. There is a lot of overhead when this is done with OS processes.
I am reminded of the other paper in the book about fault-tolerant operating systems, Guardian. Guardian's system was about redundancy. It had duplicated hardware as well as software processes. This is more of trying to isolate systems as to not interfere with one another.
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