单项选择题

Which of the following best describes a hash function？（）

A.An irreversible fast encryption method
B.A reversible fast encryption method
C.A reversible value computed from a piece of data and used to detect modifications
D.An irreversible value computed froma piece of data and used to detect modifications
E.A table inwhich values are stored for efficient retrieval.

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热门试题

单项选择题Whatdoesqospre-classifyprovidesinregardtoimplementingQoSoverGRE IPSecVPNtunnels？（）

A. enables IOS to copy the ToS field from the inner （original） IPheader to theouter tunnel IP header
B. enables IOS to make a copy of the inner （original） IP header and to run a QoS classification before encryption， based on fields in the inner IP header.
C. enables IOS to classify packets based on the ToS field in the inner （original） IP header
D. enables IOS to classify packets based on the ToS field in the outer tunnel IP header
E. enables the IOS classification engine to only see a single encrypted and tunneledflow to reduce classification complexity

多项选择题Asymmetricandsymmetricciphersdifferinwhichofthefollowingway（s）？（）

A.Asymmetric ciphers use pre-shared keys
B.Symmetric ciphers are faster to compute
C.Asymmetric ciphers are faster to compute
D.Asymmetric ciphers use public and private

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