初学者求助...

Your boss is concerned about routing loops with the use of distance vector routing protocols such as RIP and IGRP in your network you would like to ensure him that there are mechanisms used to prevent the possibility of a routing loop. Which of the following are examples of this mechanism? (Choose two.)

A. Link-state advertisement (LSA)

B. Spanning Tree Protocol.

C. Shortest path first tree.

D. Split horizon.

E. Hold-down timers.

问题和答案都是什么意思啊 谢谢

没有人回答那！！！

Your boss is concerned about routing loops with the use of distance vector routing protocols such as RIP and IGRP in your network you would like to ensure him that there are mechanisms used to prevent the possibility of a routing loop. Which of the following are examples of this mechanism? (Choose two.)

你的老板担心在网络使用距离矢量的路由协议（例如：RIP，IGRP）会产生路由环路，你应该使其确信有这样一种机制能够阻止路由环路的产生。这种机制的例子有什么？

答案：D. Split horizon. 水平分割 E. Hold-down timers. 阻止时间

阻止路由环路产生有五种机制：Defining a maximum count，split horizon，Route poisoning，triggered updates，holddown timers

谢谢