Whattwo things must you do onthe router before generating an SSH key with the "crypto key generate rsa"IOS command？ （）

单项选择题Whatisthemainreasonforusingthe ipipsdeny-actionips-interface IOScommand？（）

A. To selectively apply drop actions to specific interfaces
B. To enable IOS to droptraffic for signatures configured with the Drop action
C. To support load-balancing configurations in which traffic can arrive via multipleinterfaces 
D. This is nota valid IOS command

多项选择题WhichofthefollowingistrueabouttheCiscoIOS-IPSfunctionality？（）

A. The signatures available are built into the IOS code.
B. Toupdate signatures youneed to install a new IOS image
C. To activate new signatures you download a new Signature DefiitionFile （SDF） from Cisco’s web site
D. Loading and enabling selected IPS signatures is user configurable
E. Cisco IOS onlyprovides Intrusion Detection functionality
F. Cisco IOS-IPS requires a network module installed in your router running sensor software

单项选择题WhatistrueaboutaPre-BlockACLconfiguredwhensettingupyoursensortoperformIPBlocking？（）

A. The Pre-Block ACL is overwritten when a blockingaction is initiatied by the sensor
B. The blocking ACL entries generated by the sensor override the Pre-Block ACL entries
C. The Pre-Block ACL entries override the blocking ACL entries generated by the sensor
D. The Pre-Block ACL is replaced by the Post-Block ACL when a blocking actionis initiated bythe sensor
E. You can not configure a Pre-Block ACL when configuring IP Blockingon your sensor

多项选择题WhichtwoIPmulticastaddressesbelongtothegrouprepresentedbytheMACaddressof0x01-00-5E-15-6A-2C？（）

A. 224.21.106.44
B. 224.25.106.44
C. 233.149.106.44
D. 236.25.106.44
E. 239.153.106.44

单项选择题AnetworkadministratorisusingaLANanalyzertotroubleshootOSPFrouterexchangemessagessenttoALLOSPFROUTERS.TowhatMACaddressarethesemessagessent？（）

A. 00-00-1C-EF-00-00
B. 01-00-5E-00-00-05
C. 01-00-5E-EF-00-00
D. EF-FF-FF-00-00-05
E. EF-00-00-FF-FF-FF
F. FF-FF-FF-FF-FF-FF