what is four ospf area type？

When upgrading the IOS image,the network administrator receives the exhibited error message.What could be the cause of this error?（）

當將多個交換機加入到MST region當中會發(fā)生什么（what happen）？

Refer to the exhibit.How many broadcast domains exist in theexhibited topology？（）

As a CCNA candidate,you must have a firm understanding of the IPv6 address structure.Refer to IPv6 address,could you tell me how many bits are included in each filed?（）

hsrp speak狀態(tài)是什么意思？

DHCP SERVER在給一個網(wǎng)段設置POOL時，該網(wǎng)段路由器接口地址能不能放入POOL，能why，不能why。

什么是NAT？

Refer to the exhibit.What is the meaning of the term dynamic as displayed in the output of the show frame-relay map command shown？（）

SPT初始狀態(tài)之后的一個狀態(tài)是什么？