Which description is making sense on the basis of the given information?（）

单项选择题Which keyword is used with the debug ipv6 [keyword] command to troubleshoot neighbor discovery problems?（）

A.transaction
B.icmp
C.discovery
D.nd

多项选择题Which three of the following are components of a syslog message? （）(Choose three.)

A. time stamp
B. error codes
C. severity level
D. log message name

单项选择题Which of these commands can you use to show if an operational Catalyst switch port is set for autonegotiation of speed and duplex when running Cisco IOS software?（）

A. show port network
B. show running-config
C. show controllers Ethernet-controller
D. show interfaces

单项选择题In comparison with traditional Layer 2 and Layer 3 system, Cisco Catalyst 6500 Virtual Switching System (VSS) 1440 simplifies a network by the means of:（）

A. providing loop-free technology.
B. providing HSRP/VRRP.
C. managing additional routing peers.
D. managing two nodes and configuration.

单项选择题You are working with a client to deploy QoS on their Frame Relay WAN. They would like to be able to allow packets to cross the Frame Relay WAN but have them marked as discard eligible if they exceed the QoS policy. How would you accomplish this task?（）

A. Configure a class map that sets the DE bit so that the policy map can correctly apply a violate-action if the policy is exceeded.
B. Configure a service policy that sets the DE bit and apply it to the serial interface connected to the Frame Relay WAN.
C. Configure a policy map that has a burst-max action of setting the DE bit if the policy is exceeded.
D. Configure a policy map that has a violate-action to change the DE bit from 0 to 1.