当施工用的10kV及以下变压器装于地面时．一般应有0.5m的高台，高台周围应装设栅栏，其高度不低于（)，

he company LAN and that the switch has stopped functioning. It has been replaced with a Cisco Catalyst 2950 series switch.What must be done to ensure that this new switch becomes the root bridge on the network？（）

A.One router is running RIPv1.

B.RIP neighbor is 224.0.0.9.

C.The network contains a loop.

D.Network 10.10.1.0 is reachable.

A. by snooping the CoS marking on the incoming frames

B. by using RTP hello messages between the switch port and the Cisco IP Phone

C. by using CDP

D. by using DHCP snooping

E. by snooping the incoming 802.1Q VLAN tag

A. by snooping the CoS marking on the incoming frames

B. by using RTP hello messages between the switch port and the Cisco IP Phone

C. by using CDP

D. by using DHCP snooping

E. by snooping the incoming 802.1Q VLAN tag

he company LAN and that the switch has stopped functioning. It has been replaced with a Cisco Catalyst 2950 series switch. What must be done to ensure that this new switch becomes the root bridge on the network？（）

A. Lower the bridge priority number.

B. Change the MAC address of the switch.

C. Increase the VTP revision number for the domain.

D. Lower the root path cost on the switch ports.

E. Assign the switch an IP address with the lowest value.

A. show port network

B. show running-config

C. show controllers Ethernet-controller

D. show interfaces

port in an edge network. It is possible for a Cisco Catalyst switch to check if a Cisco IP Phone is directly attached to that port by:（）

A. using DHCP snooping

B. snooping the incoming 802.1Q VLAN tag

C. using CDP

D. snooping the CoS marking on the incoming frames

nt supervisor engine in a CIS network. What is the result of issuing the redundancy force-switchover command on that switch？（）

A. Automatic switchover from active to standby on primary supervisor failure

B. Reset of the primary supervisor.

C. Manual switchover from active to standby supervisor

D. Manual switchover from standby to active supervisor

A. Cisco Network Assistant

B. Cisco Security Device Manager

C. Cisco Device Manager

D. Cisco Adaptive Security Device Manager

status LED on a Cisco Catalyst series switch is alternating green and amber. Which condition could this indicate（）。

A.The port is experiencing errors

B.The port is administratively disabled

C.The port is blocked by spanning tree

D.The port has an active link with normal traffic activity

A.This switch has more than one interface connected to the root network segment in VLAN 2.

B.This switch is running RSTP while the elected designated switch is running 802.1d Spanning Tree.

C.This switch interface has a higher path cost to the root bridge than another in the topology.

D.This switch has a lower bridge ID for VLAN 2 than the elected designated switch.