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Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) · Cisco
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When OSPF->EIGRP redistribute, by default OSPF router R3 does not send external-RIP subnet 10.1.1.0/24 (OSPF LSA type2 E2). So no need to worry about OSPF->EIGRP redistribution. So Option.B gone
Correct Answer is A. Traffic flows for the prefix 10.1.1.10 from R1(RIP)--> R2 (RIP) --> R4 (EIGRP 170) -----> R3 (OSPF 110) --------> R2 (OSPF 110) In R2 OSPF AD(110) is preferred than RIP AD(120). Because of that R2 flushes the RIP prefix(10.1.1.10) out of its routing table. So R4 and R3 will flush that prefix consecutively.
R2# debug ip routing *Jan 9 18:22:41.547: RT: updating rip 10.1.1.0/24 (0x0): via 12.12.12.1 Fa0/0 1048578 *Jan 9 18:22:41.547: RT: add 10.1.1.0/24 via 12.12.12.1, rip metric [120/1] R2# *Jan 9 18:22:42.587: RT: updating ospf 10.1.1.0/24 (0x0): via 23.23.23.3 Fa2/0 1048578 *Jan 9 18:22:42.591: RT: closer admin distance for 10.1.1.0, flushing 1 routes *Jan 9 18:22:42.591: RT: add 10.1.1.0/24 via 23.23.23.3, ospf metric [110/20] R2# *Jan 9 18:22:46.707: RT: del 10.1.1.0 via 23.23.23.3, ospf metric [110/20] *Jan 9 18:22:46.707: RT: delete subnet route to 10.1.1.0/24