A remote host can be pinged from all switches except one. 
Which of the following is the most likely reason for this failure？（）

单项选择题Whatistheresultofenteringthecommandspanning-treeloopguarddefault？（）

A.The command enables both loop guard and root guard.
B.The command changes the status of loop guard from the default of disabled to enabled.
C.The command activates loop guard on point-to-multipoint links in the switched network.
D.The command will disable EtherChannel guard.

单项选择题Whatistheresultofenteringthecommandport-channelload-balancesrc-dst-iponanEtherChannellink？（）

A.Packets are distributed across the ports in the channel based on both the source and destination MAC addresses.
B.Packets are distributed across the ports in the channel based on both the source and destination IP addresses.
C.Packets are balanced across the ports in the channel based first on the source MAC address， then on the destination MAC address， then on the IP address.
D.Packets are distributed across the access ports in the channel based first on the source IP address and then the destination IP addresses.

多项选择题WhichthreeofthefollowingareorganizationalobjectivesthatshouldbeaddressedwhendevelopinganewVLANimplementationplan？（）

A.network management
B.improving QoS
C.determining budget
D.reducing costs
E.increasing competitiveness
F.improving customer support

单项选择题You work as a network engineer for. You study the exhibit carefully. Based on the output of the show command，  what can you determine regarding EIGRP routing being performed by the switch？ （） Exhibit：

A.There are 20 neighbors in the EIGRP neigbor table.
B.EIGRP is running normally and receiving IPv4 routing updates.
C.The switch has not established any neighbor relationships. Further network testing and troubleshooting must be performed to determine the cause of the problem.
D.EIGRP status cannot be determined. The command show ip eigrp topology would determine the routing protocol status.

单项选择题You work as a network engineer for . You study the exhibit carefully. Based upon the output shown，  what can you determine？（）  Exhibit：

A.VLAN 30 is not operational due to the fact that there are no packet or byte counts indicated. 
B.The IP Cisco Express Forwarding configuration is capable of supporting IPv6.
C.Cisco Express Forwarding load balancing has been disabled.
D.SVI VLAN 30 connects directly to the 10.1.30.0/24 network due to a valid glean adjacency.