QoS機(jī)制中的分類，采用ip數(shù)據(jù)包中的哪個(gè)字段？

Refer to the exhibit.Which statement describes DLCI 17?（）

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

four switches， which one will be root switch.（no pic）.

兩ebgp鄰居發(fā)路由過來 ，哪些屬性重置？

什么是NAT？

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

What is the three main step of using the QoS feature with MQC command line interface？

How should arouter that is being used in a Frame Relay network be configured to avoid split horizon issues from preventing routing updates?（）

what is four ospf area type？