In a brute-force attack， what percentage of the keyspace must an attacker generally search through until heor she finds the key that decrypts the data？（）

单项选择题Refertotheexhibit.Whatdoestheoptionsecret5intheusernameglobalconfigurationmodecommandindicateabouttheenablesecretpassword？（）

A.It is hashed using SHA
B.It is encrypted using DH group 5
C.It is hashed using MD5
D.It is encrypted via the service password-encryption command
E.It is hashed using a proprietary Cisco hashing algorithm
F.It is encrypted using a proprietary Cisco encryption algorithm

单项选择题IfyouclicktheConfigurebuttonalongthetopofCiscoSDM isgraphicalinterface，whichTasksbuttonpermitsyoutoconfiguresuchfeaturesasSSH，NTP，SNMP，andsyslog？（）

A.Interfaces and Connections
B.Intrusion Prevention
C.Security Audit
D.Additional Tasks

单项选择题WhichoneoftheCiscoIOScommandscanbeusedtoverifythateithertheCiscoIOSimage，theconfigurationfiles，orbothhavebeenproperlybackedupandsecured？（）

A.show archive
B.show flash
C.show file systems
D.show secure bootset

单项选择题InanIEEE802.1xdeployment，betweenwhichtwodevicesEAPOLmessagestypicallyaresent？（）

A.Between the supplicant and the authenticator
B.Between the authenticator and the authentication server
C.Between the supplicant and the authentication server
D.Between the RADIUS server and the authenticator

单项选择题Whatisastaticpacket-filteringfirewallusedfor？（）

A.It validates the fact that a packet is either a connection request or a data packet belonging to a connection
B.It evaluates network packets for valid data at the application layer before allowing connections
C.It analyzes network traffic at the network and transport protocol layers
D.It keeps track of the actual communication process through the use of a state table