[单项选择]Your ARPA has two guard zones.What is the purpose of the inner guard zone（）.
A. Alert the watch officer that a vessel is approaching the preset CPA limit
B. Warn of small targets that are initially detected closer than the outer guard zone
C. Guard against target loss during critical maneuvering situations
D. Sound an alarm for targets first detected within the zone

[单项选择]Your ARPA has been tracking a target and has generated the targets course and speed.The radar did not receive a target echo on its last two scans due to the weather.What should you expect under these circumstances（）.
A. The ARPA will generate data as if the target was still being tracked by radar
B. The ARPA will give an audible and/or visual lost target alarm
C. The ARPA will generate data based on sea return echoes from the vicinity where the target was lost
D. The ARPA has lost all memory of the target and must recompute the target data

[单项选择]Your ARPA has automatic speed inputs from the log．Due to currents，the log is indicating a faster speed than the speed over the ground.What should you expect under these circumstances（）.
A. The generated CPA will be less than the actual CPA
B. The generated TCPA will be later than the actual TCPA
C. The range of initial target acquisition will be less than normal
D. The targets true course vector will be in error

[单项选择]Your company has two servers that run windows server 2008 named server2 and server3, both servers have the DNS server role installed. Server3 is configured to forward all DNS requests to server2. You update a DNS record on server2, you need to ensure that server3 is able to immediately resolve the updated DNS record. What should you do?（）
A. Run the dnscmd /clearcache on server3.
B. Run the ipconfig /flushdns command on server3.
C. Decrease the time-to-live (TTL) on the start of authority (SOA) record of na.contoso.com to 15minutes.
D. Increase the retry interval value on the start of authority (SOA) record of na.contoso.com to 15 minutes.

[单项选择] Your company has two servers that run Windows Server 2008 R2 named Server2 and Server3. Both servers have the DNS Server server role installed. Server3 is configured to forward all DNS requests to Server2. You update a DNS record on Server2. You need to ensure that Server3 is able to immediately resolve the updated DNS record. What should you do？（）
A. Run the dnscmd . /clearcache command on Server3.
B. Run the ipconfig /flushdns command on Server3.
C. Decrease the Time-to-Live (TTL) on the Start of Authority (SOA) record of na.contoso.com to 15 minutes.
D. Increase the Retry Interval value on the Start of Authority (SOA) record of na.contoso.com to 15 minutes.

[单项选择] your company has a main office and two branch offices. Domain controllers in the main office host an active directory-integrated zone. The DNS servers in the branch office host a secondary zone for the domain and use the main office DNS servers as their DNS master servers for the zone. The company adds a new branch office. You add a member server named branch3 and install the DNS service on the server. You configure a secondary zone for the domain. The zone transfer fails. You need to configure DNS to provide zone data to the DNS server in the new branch office. What should you do?（）
A. Run dnscmd using the zoneresetmasters option.
B. Run dnscmd by using the zoneresetsecondaries option.
C. Add the new DNS server to the zone transfers tab on one of the DNS servers in the main office.
D. Add the new DNS server to the DNSUpdateProxy global security group in active directory users and computers.

[单项选择] Your company has a main office and two branch offices that are connected by WAN links. The main office runs the DNS Server service on three domain controllers. The zone for your domain is configured as an Active Directory-integrated zone. Each branch office has a single member server that hosts a secondary zone for the domain. The DNS servers in the branch offices use the main office DNS server as the DNS Master server for the zone. You need to minimize DNS zone transfer traffic over the WAN links. What should you do？（）
A. Decrease the Retry Interval setting in the Start of Authority (SOA) record for the zone.
B. Decrease the Refresh Interval setting in the Start of Authority (SOA) record for the zone.
C. Increase the Refresh Interval setting in the Start of Authority (SOA) record for the zone.
D. Disable the netmask ordering option in the properties of the DNS Master server for the zone.

[单项选择]A router has two FastEthernet interfaces and needs to connect to four vlans in the local network.How can you accomplish this task，using the fewest physical interfaces and without decreasing networkper formance？（）
A. Add two more FastEthernet interfaces.
B. Add a second router to handle the vlan traffic.
C. Use a hub to connect the four vlans with a FastEthernet interface on router.
D. Implement a router-on-a-stick configuration.

[单项选择]A psychrometer has two thermometers that provide dry bulb and wet bulb temperatures. By comparing these two temperature readings with a set of tables you can determine the （）.
A. atmospheric pressure
B. wind speed
C. relative humidity and dew point
D. wind chill factor