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350-029 is related to graceful restart, VRRP, GLBP, IP event dampening. 70-648 is associated with connectivity prerequisites for instance connecting branch offices and individual users in distant locations to the enterprise network and connecting .networks to the Internet. To prepare for 1z0-042 test, testking brings superb study guides. 642-552 offers secure Cisco routers employing the SDM Security Audit feature. 642-892 describes operations of multiarea OSPF.