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【单选题】

What is the action that a GMDSS Radio Operator should take when a DSC distress alert is received? （）

A、No action is necessary，as the DSC control unit will automatically switch to the NBDP follow-on communications frequency

B、The operator should immediately set continuous watch on the radiotelephone frequency that is associated with the frequency band on which the distress alert was received

C、The Operator should immediately set continuous watch on VHF channel 70

D、The Operator should immediately set continuous watch on the NBDP frequency that is associated with the frequency band on which the distress alert was received

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第1题
[单选题] The system hangs at boot time after starting NFS services.What is the most likely cause?（）

A、The action parameter of rcnfs in /etc/inittab is 'off' and the script called is not exiting.  B、The action parameter of rcnfs in /etc/inittab is 'wait' and the script called is not exiting.  C、The action parameter of rcnfs in /etc/inittab is 'once' and the script called is not exiting.  D、The action parameter of rcnfs in /etc/inittab is 'respawn' and the script called is not exiting.  

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第2题
[单选题] Which statement is true about a NAT rule action of off?（）

A、The NAT action of off is only supported for destination NAT rule-sets.  B、The NAT action of off is only supported for source NAT rule-sets.  C、The NAT action of off is useful for detailed control of NAT.  D、The NAT action of off is useful for disabling NAT when a pool is exhausted  

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第3题
[] If a metric is not specified for routes that are redistributed into OSPF, the defaul t metric that is assigned to the routes is 20, except for redistributed BGP routes. What is the metric that is assigned to redistributed BGP routes?（） If a metric is not specified for routes that are redistributed into OSPF, the defaul t metric that is assigned to the routes is 20, except for redistributed BGP routes. What is the metric that is assigned to redistributed BGP routes?（）

A、A. 200  B、B. 0  C、C. 1  D、D. 10  

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第4题
[单选题] A packet is evaluated against three user-defined terms within a firewall filter and no match is found. What correctly describes the action the firewall filter will take for this packet?（）

A、The filter will permit the packet and take no additional action  B、The filter will reject the packet and send an ICMP message back to the sender  C、The filter will discard the packet and take no additional action  D、The filter will permit the packet and write a log entry to the firewall log  

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第5题
[单选题] A packet is evaluated against three user-defined terms within a firewall filter and no match is found. What correctly describes the action the firewall filter will take for this packet?（）

A、The filter will permit the packet and take no additional action.  B、The filter will reject the packet and send an ICMP message back to the sender.  C、The filter will discard the packet and take no additional action.  D、The filter will permit the packet and write a log entry to the firewall log.  

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第6题
[] A vessel is entering port A for the first time and has a Pilot conning the vessel. The Master is unsure that the Pilot is taking sufficient action to prevent a collision. What should the Master do（）.

A、A.Nothing; The Pilot is required by law and is solely responsible for the safety of the vessel  B、B.State his concerns to the Pilot but do not interfere with the handling of the vessel  C、C.Direct the Pilot to stop the vessel and anchor if necessary until the situation clears  D、D.Recommend an alternative action and if not followed relieve the Pilot  

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第7题
[] A vessel is entering port “A” for the first time and has a Pilot conning the vessel. The Master is unsure that the Pilot is taking sufficient action to prevent a collision. What should the Master do? （）

A、A.Nothing; The Pilot is required by law and is solely responsible for the safety of the vessel  B、B.State his concerns to the Pilot but do not interfere with the handling of the vessel  C、C.Direct the Pilot to stop the vessel and anchor if necessary until the situation clears  D、D.Recommend an alternative action and if not followed relieve the Pilot  

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第8题
[] The system hangs at boot time after starting NFS services. What is the most likely cause？（） 

A、A.The action parameter of rcnfs in /etc/inittab is ’off’ and the script called is not exiting.  B、B.The action parameter of rcnfs in /etc/inittab is ’wait’ and the script called is not exiting.  C、C.The action parameter of rcnfs in /etc/inittab is ’once’ and the script called is not exiting.  D、D.The action parameter of rcnfs in /etc/inittab is ’respawn’ and the script called is not exiting  

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第9题
[单选题] What is the default action for firewall filters?（）

A、accept  B、reject  C、discard  D、log  

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