Asymmetric and symmetric ciphers differ in which of the following way（s）？ （） 

单项选择题WhichofthefollowingisthemosteffectivetechniquetopreventsourceIPAddressspoofing？（）

A. policy based routing （PBR）
B. unicast reverse path forwarding （uRPF）
C. lock and keyACL
D. RFC 1918filtering
E. IP source routing

单项选择题WhichtypeofattackscanbemonitoredandmitigatedbyCS-MARSusingNetFlowdata？（）

A. Man-in-themiddle attack
B. Spoof attack
C. Land.C attack
D. Buffer Overflow
E. Day zero attack
F. Trojan Horse

单项选择题WhichbestrepresentsatypicalattackthattakesadvantageofRFC792，ICMPType3messages？（）

A. Blind connection-reset
B. Large packet echo request
C. Packet fragmentation offset
D. Broadcast-based echo request
E. Excessive bandwidth consumption

多项选择题CiscoIOSIPSsendsIPSalertmessagesusingwhichtwoprotocols？（）

A. SDEE
B. LDAP
C. SYSLOG
D. FTP
E. SNMP
F. SMTP

多项选择题WhenimplementingWLANsecurity，whatarethreebenefitsofusingtheTemporalKeyIntegrityProtocol（TKIP）insteadofWEP？（）

A. TKIP uses an advanced encryption scheme based on AES
B. TKIP provides authentication and integrity checking using Cipher Block Chaining Message Authentication Code （CBC-MAC）
C. TKIP provides per-packet keyingand a rekeying mechanism
D. TKIP provides message integrity check
E. TKIP reduces WEP’s vulnerabilities byusing different hardware encryption chipset
F. TKIP uses a 48 bit InitializationVector