Which two of the following actions must an OSPF NSF-capable router execute after a supervisor engine switchover?（） (Choose two.)

单项选择题What is the purpose of IP Event Dampening?（）

A. to configure a subinterface so that it can be applied to the primary interface in order to prevent exponential selective dampening
B. to suppress the effects of excessive interface flapping events on routing protocols and routing tables in the network
C. to introduce a nonconfigurable exponential delay mechanism
D. to allow the network operator to configure a router to automatically dampen and selectively identify a local interface that is failing

多项选择题CIS .com recently acquired a smaller competitor. The acquired company is not currently using Cisco routers, so you have connected the two WANs via an authenticated PPP link. After configuration both routers, issuing the show interface s0 0 command on the Cisco Router shows the interface to be in the up down state. Which two of these are possible causes? （）

A. Bandwidth statements do not match
B. MTUs do not match
C. IP Addresses are not in the same subnet
D. CHAP passwords do not match

单项选择题You are working with a client to classify the different types of application traffic they will have on their network and to assign a QoS value to each traffic flow. The client has identified the following applications: Internet traffic, Oracle, network-based backups, AOL Instant Messenger, IP routing, voice, and voice signaling. Given these types of applications, how many different classes will need to be configured in QoS?（）

A. 8
B. 6
C. 9
D. 5

多项选择题Which three of these items are found within the router advertisement message of IPv6 stateless autoconfiguration?（） (Choose three.)

A. flags indicating the kind of autoconfiguration that can be done by hosts
B. default router information
C. /64 prefix that can be used on the link and the lifetime of the prefix
D. IPv6 DHCP server address information

多项选择题As a network administrator, you are required to configure a switch port for a private Virtual LAN. In such a situation, which three of the following connection modes will be available during the configuration process? （）(Choose three.)

A. isolated mode
B. modular mode
C. community mode
D. promiscuous mode
E. non-isolated
F. permanent