Which spanning Tree Protocol has been implemented on switch 2？ （）

多项选择题Whichthreecharacteristicsaretrueaboutvoicetrafficinthecampusnetwork？（）

A.TCP retransmits
B.benign
C.greedy
D.drop sensitive
E.smooth
F.delay insensitive

单项选择题Refer to the exhibit. The command spanning-tree guard root is configured on interface Gi0 0 on both switch S2 and S5. The global configuration command spanning-tree uplinkfast has been configured on both switch S2 and S5. The link between switch S4 and S5 fails.  Will Host A be able to reach Host B？ （）

A.Yes. Traffic can pass either from switch S6 to S3 to S2 to S1， or， from switch S6 to S5 to S2 to S1.
B.No. Traffic will pass from switch S6 to S5 and dead-end at interface Gi 0/0.
C.No. Traffic will loop back and forth between switch S5 and S2.
D.Yes. Traffic will pass from switch S6 to S3 to S2 to S1.
E.No. Traffic will either pass from switch S6 to S5 and dead-end， or traffic will pass from switch S6 to S3 to S2 and dead-end.

单项选择题On an Aironet card， LED 0 and LED 1 are blinking alternately.  What does this indicate？ （）

A.The Aironet card is in power save mode.
B.The Aironet card is looking for a network association.
C.The Aironet card is joined to a network， but there is no network activity.
D.The Aironet card is joined to a network， and there is network activity.

多项选择题WhichtwostatementsaretrueabouttheconfigurationofvoiceVLANs？（）

A.Static secure MAC addresses can be configured in conjunction with voice VLANs.
B.PortFast is automatically enabled when voice VLANs are configured.
C.PortFast must be manually configured when voice VLANs are configured.
D.Voice VLANs are typically configured on uplink ports.
E.Voice VLANs are typically configured on access ports.

单项选择题Refer to the exhibit.  Which statement is true about the display of the command show pagp 1 neighbor command？（）

A.STP packets are sent out the Gi0/1 interface only.
B.STP packets are sent out both the Gi0/1 and Gi0/2 interfaces.
C.CDP packets are sent out the Gi0/1 interface only. 
D.CDP packets are sent out the Gi0/2 interface only.