简答题 什么协议可以使用虚拟IP和虚拟MAC ，在错误发生的时候，避免连接的丢失。

单项选择题Refer to the exhibit. Based on this configuration, what type of marker is achieved?（）

A.Single-rate，two-color marker
B.Three-rate，two-color marker
C.Two-rate，three-color marker
D.Single-rate，three-color marker

问答题Onamulticastenvironment，whatisprocessforinstallingandrunanapplicationonhost？

问答题whatisIOSfeaturelimitorcontrolstrafficonacatalystinterface？

单项选择题You work as a network technician at Company.com， study the exhibit provided. You are implementing this QoS configuration to improve the bandwidth guarantees for traffic towards two servers， one with the IP address 5.5.5.5 and the other with the IP address 5.5.5.4. Even after the configuration is applied， performance does not seem to improve. Which will be the most likely cause of this problem？（）

A.The policy map mark has been applied on a half-duplex Ethernet interface；This is not supported.
B.The policy map queue is configured on the wrong interface； it is applied on the Serial interface whereas traffic is going over the tunnel interface.
C.The class maps are wrongly configured
D.The ip nbar protocol-discover command cannot be configured together with a Service policyoutput on the serial interface.
E.This is probably a software bug

问答题IP报头中的FragmentOffset字段的作用？