Under which two circumstances should Spanning Tree Protocol be implemented?（）

A . upon a port state change B . upon receiving a topology change notification C . when transitioning from discarding to forwarding D . when transitioning from forwarding to discarding E . only when changing from listening to discarding F . when CAM resources have been completely used u

A . alternator B . glass thermometer C . burdon tube D . piezoelectric pressure transducer

A . The fishing vessel must keep clear of the vessel not under command B . If the vessel not under command is a power-driven vessel，she must keep clear of the fishing vessel C . They must exchange whistle signals D . Both vessels are required to take action to stay clear of each other

A . Constant inspection B . Keeping constant load C . Remaining constant temperature D . Varying speed

A . Cisco Switches only B . All Cisco Products C . Cisco Integrated Services Routers Only D . Low-End Products only

A . The search target is sighted and then lost B . More than one vessel is available for a search C . The search object is a target that will be readily detected by radar D . An aircraft is available to assist a surface vessel

A . The method waitforId（） in class MediaTracker is called. B . The run（） method that the thread is executing ends. C . The call to the start（） method of the Thread object returns. D . The suspend（） method is called on the Thread object. E . The wait（） method is called on the Thread object.

A . ICD   B . CMT   C . JTAPI   D . Applicatio

A . an International Ship Security Certificate B . an International Oil Pollution Prevention Certificate C . a Safety Management Certificate D . an International Ballast Water Management Certificate

A . when they receive a special token B . when there is a carrier C . when they detect no other devices are sending D . when the medium is idle E . when the server grants acce

A . Petroleum and fuel oil B . Sludge C . Oil mixed with dredge spoil D . Oil refuse and oil mixed with waste

A .  The tag is invoked without a body. B .  The doTAb method throws an exception. C .  The

A .  to ensure a loop-free topology B .  to protect against user-side loops C .  when a VLAN spans access layer switches D .  for the most deterministic and highly available network topology E .  because of the risk of lost connectivity without Spanning Tree Protocol

A . Next Business day hardware replacement B . Application Software Upgrades C . Automatic priority 1 TAC cases D . Open a service request with the SMB TAC 24 Hours a day, 7 days a week

A . inheritance in the review form was disabled  B . shared values were enabled on both forms   C . shared field values and field definitions were enabled  D . show response documents in a hierarchy was not enabled

A . Configure a routing process using the command ipv6 router ospf [process-id]. B . Add the network statement for the interfaces on which OSPF will run. C . Configure OSPF on the interface that it will run on. D . Use the passive-interface command on the interfaces on which OSPF should not run. E . Enable routing.

A .  Products and Solutions B .  Ordering C .  Technical Support and Documentation D .  Partner Central

A . The power-driven tug must maneuver to avoid collision B . You must maneuver to avoid the tug and tow C . You must maneuver to avoid collision only if the tug is to leeward and the wind is on your port side D . Both vessels are required to maneuver to avoid collisio

A . Towing vessels B . Offshore supply vessels C . Barges，when manned D . All of the above

A . Class A B . Class 1 C . Class 2 D . Class 3 E . Class 4

A . performing inter - VLAN routing B . performing 802.1Q trunking C . performi ng ISL trunking D . Ethernet Switch Module installed E . ADSL WIC installed F . running Call Manager Expre

A．University/college B．Move/run C．Furniture/table D．Mature/ripe