WhenimplementingbestpracticesforIPSourceAddressSpoofingandDefeatingDenialofServiceAttackswithIPSourceAddressSpoofing，whatRFCiscommonlyusedtoprotectyournetwork？（）
A. RFC1149
B. RFC3704
C. RFC1918
D. RFC2827
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Selectivepacketdiscard（SPD）operatesinthefollowingmodes（）.
A. normal
B. select
C. random
D. discard
E. full
WhichdescriptionsofNetflowiscorrect？（）
A. Bydefault，NetflowrecordsbidirectionalIPtrafficflow.
B. NetflowanswersquestionsregardingIPtraffic：who，what，where，when，andhow
C. Netflowaccountsforbothtransittrafficandtrafficdestinedfortherouter.
D. Netflowreturnsthesubinterfaceinformationintheflowrecords.
WhichtwoFibreChannelfeaturesarenotsupportedinCiscoNexus5500andNexus5000platforms？（）
A. portsecurity
B. fabricbinding
C. IVR
D. porttracking
E. FICON
姜黄素分光光度法测定水中硼，水样中硝酸盐氮含量大于（）mg/L时，产生干扰，必须除去。
A. 10
B. 15
C. 20
D. 25
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