Refer to the exhibit. LACP has been configured on Switch1 as shown. 
Which is the correct command set to configure LACP on Switch2？（）

单项选择题Refer to the exhibit.  What command was issued on the Layer 3 switch Sw1 between Exhibit #1 and Exhibit #2？（）

A.ip routing
B.no ip routing
C.router eigrp 1
D.no router eigrp 1
E.mls qos
F.no mls qos

单项选择题WhatmustbethesametomakemultipleswitchespartofthesameMultipleSpanningTree（MST）？（）

A.VLAN instance mapping and revision number
B.VLAN instance mapping and member list
C.VLAN instance mapping， revision number， and member list
D.VLAN instance mapping， revision number， member list， and timers

单项选择题Refer to the exhibit. Switch 15 is configured as the root switch for VLAN 10 but not for VLAN 20. If the STP configuration is correct，  what will be true about Switch 15？（）

A.All ports will be in forwarding mode.
B.All ports in VLAN 10 will be in forwarding mode.
C.All ports in VLAN 10 will be in forwarding mode and all ports in VLAN 20 will be in blocking mode.
D.All ports in VLAN 10 will be in forwarding mode and all ports in VLAN 20 will be in standby mode.

多项选择题WhichtwostatementsaretrueaboutBPDUport-guardandBPDUfiltering？（）

A.BPDU port-guard can be enabled globally， whereas BPDU filtering must be enabled on a per-interface basis.
B.When globally enabled， BPDU port-guard and BPDU filtering apply only to PortFast enabled ports.
C.When globally enabled， BPDU port-guard and BPDU filtering apply only to trunking-enabled ports.
D.When a BPDU is received on a BPDU port-guard enabled port， the interface goes into the err-disabled state.
E.When a BPDU is received on a BPDU filtering enabled port， the interface goes into the err-disabled state.
F.When a BPDU is received on a BPDU filtering enabled port， the interface goes into the STP blocking state.

单项选择题Refer to the exhibit and the partial configuration of switch SW_A and SW_B. STP is configured on all switches in the network. SW_B receives this error message on the console port： 00：06：34： %CDP-4-DUPLEX_MISMATCH： duplex mismatch discovered on FastEthernet0 5 （not half  duplex）， with SW_A FastEthernet0 4 （half duplex） ， with TBA05071417（Cat6K-B） 0 4 （half duplex）.  What would be the possible outcome of the problem？（）

A.The root port on switch SW_A will automatically transition to full-duplex mode.
B.The root port on switch SW_B will fallback to full-duplex mode.
C.The interfaces between switches SW_A and SW_B will transition to a blocking state.
D.Interface Fa 0/6 on switch SW_B will transition to a forwarding state and create a bridging loop.