单项选择题 The Testking router is running both RIP and IGRP, and the same route is learned by this router from both of these methods. However, when you issue the command"show ip route" you see only the IGRP route, and not the RIP route. Why is this?（）

单项选择题 Which one of the following answer choices below is true regarding the OSPF topology database?（）

多项选择题 What are two characteristics of the OSPF process identifier?（）