单项选择题 The network is displayed in the diagram below： You use the following information for switch SWA：  Port Mode Encapsulation Status Native VLAN fa0/1 desirable n-802.1q trunking 5 Port VLANs is allowed on trunk fa0/ 1 1-100， 102-1005  Port VLANs is owned and active in management domain fa0/1 1-6. 8-100， 102-115， 197-999， 1002-1005  Port VLANs in spanning tree forwarding state and not pruned fa0/1 1-6， 8-100， 102-105， 108-999， 1002-1005  SW users in VLAN 107 complain that they are unable to gain access to the resources through theSW1 router.  What is the cause of this problem？（）

单项选择题 Whatshouldyoudotoreducespanning-treeprotocolBPDUtrafficduringextendedperiodsofinstabilityinyourVLANs？（）

多项选择题 Exhibit SW1#show spanning-tree vlan 200 VLAN200 Spanning tree enabled protocol iee eRoot ID Priority 32968 Address 000c.ce29.ef00 Cost 19 Port 2 （FastEthernet0/2） Hello time 10 Sec Max Age 20 sec Forward Delay 30 sec  Bridge ID Priority 32968 （priority 32768 sys-id-ext 200） Address 000c.ce2a.4180 Hello Time 2 sec Max Age 20 Sec Forward Delay 15 sec  Interface Role Sts Cost PrioNbr Type Fa0/2 Root FWD 19 128.2 P2p Fa0/3 Altn BLK 19 128.3 P2p   Based on the show spanning-tree vlan 200 output shown in the exhibit， which two statementsabout the STP process for VLAN 200 are true？（）