单项选择题
A.OSPF and RIP use the same major network 172.16.0.0. Therefore， the keywordsubnets is notrequired to redistribute protocols into OSPF
B.Because OSPF has a longer mask for the same major network than RIP and because RIPversion 1 is being used， none of the routes learned from OSPF will be advertised into RIP
C.The metric for the OSPF routes that are redistributed into RIP is too low， a fact that preventsOSPF routes from being advertised into RIP
D.The process of redistribution of RIP into OSPF does not require any metric conversion， so thereis no need to define the metric using the default-metric command during the redistribution
单项选择题 Refer to the network shown below： R1 and R2 belong to the RIP routing domain that includes the networks 10.20.0.0/16 and 10.21.0.0/16. R3 and R4 are performing two-way route redistribution between OSPF and RIP. Anetwork administrator has discovered that R2 is receiving OSPF routes for the networks 10.20.0.0/16 and 10.21.0.0/16 and a routing loop has occurred. Which action will correct thisproblem？（）
单项选择题 Refer to the exhibit. The routing protocols EIGRP and OSPF have been configured as indicated inthe exhibit. Given the partial configuration of router R2， which network will be present in the routingtable of R4？（）
单项选择题 Refer to the exhibit and the partial configuration on router R2. On router R4 all RIP routes areredistributed into the OSPF domain. A second redistribution is configured on router R2 using aroute map. Based on the configuration on router R2， which EIGRP external routes will be presentin the routing table of R1？（）
