单项选择题

You enabled CDP on two Cisco Routers which are connected to each other. The Line and Protocol statusfor the interfaces on both routers show as UP but the routers do not see each other a CDP neighbors.Which layer of the OSI model does the problem most likely exist？（）

A.Physical
B.Session
C.Application
D.Data-Link
E.Network

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单项选择题

The following command is issued on a Cisco Router：
Router（configuration）#logging console warnings
Which alerts will be seen on the console？（）

A.Warnings only
B.debugging， informational， notifications， warnings
C.warnings， errors， critical， alerts， emergencies
D.notifications， warnings， errors
E.warnings， errors， critical， alerts

单项选择题

You have 2 NTP servers in your network - 10.1.1.1 and 10.1.1.2. You want to configurationure a Ciscorouter to use 10.1.1.2 as its NTP server before falling back to 10.1.1.1. Which commands will you use toconfigurationure the router？（）

A.ntp server 10.1.1.1 ntp server 10.1.1.2
B.ntp server 10.1.1.1 ntp server 10.1.1.2 primary
C.ntp server 10.1.1.1 ntp server 10.1.1.2 prefer
D.ntp server 10.1.1.1 fallback ntp server 10.1.1.2

单项选择题

What level of logging is enabled on a Router where the following logs are seen？（）

A.alerts
B.critical
C.errors
D.notifications