(a) Random holding and random searching |

(b) Random holding and Zipf’s searching |

(c) Random holding and particular searching |

(d) Zipf’s holding and random searching |

(e) Zipf’s holding and Zipf’s searching |

(f) Zipf’s holding and particular searching |

(g) One node searching |

Figure 9: Simulation results of P-EP2P using the sequential and simultaneous topology evaluation methods when each node participates in the network with the probability randomly assigned in between 60% and 100% at every time. |