多选题Which three security concerns can be addressed by a tunnel mode IPsec VPN secured by ESP？（）Adata integrityBdata confidentialityCdata authenticationDouter IP header confidentialityEouter IP header authentication
多选题
Which three security concerns can be addressed by a tunnel mode IPsec VPN secured by ESP？（）
A
data integrity
B
data confidentiality
C
data authentication
D
outer IP header confidentiality
E
outer IP header authentication
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多选题Which three security concerns can be addressed by a tunnel mode IPsec VPN secured by ESP?（） (Choose three.)Adata integrityBdata confidentialityCdata authenticationDouter IP header confidentialityEouter IP header authentication
多选题Which three security concerns can be addressed by a tunnel mode IPsec VPN secured by AH?（） (Choose three.)Adata integrityBdata confidentialityCdata authenticationDouter IP header confidentialityEouter IP header authentication
单选题What does qos pre-classify provides inregardto implementing QoS over GRE/IPSec VPN tunnels？（）A enables IOS to copy the ToS field from the inner （original） IPheader to theouter tunnel IP headerB 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 headerD enables IOS to classify packets based on the ToS field in the outer tunnel IP headerE enables the IOS classification engine to only see a single encrypted and tunneledflow to reduce classification complexity
多选题Which three security concerns can be addressed by a tunnel mode IPsec VPN secured by AH？（）Adata integrityBdata confidentialityCdata authenticationDouter IP header confidentialityEouter IP header authentication
多选题You need to configure a GRE tunnel on a IPSec router. When you are using the SDM to configurea GRE tunnel over IPsec， which two parameters are required when defining the tunnel interfaceinformation？（）AThe crypto ACL numberBThe IPSEC mode （tunnel or transport）CThe GRE tunnel interface IP addressDThe GRE tunnel source interface or IP address， and tunnel destination IP addressEThe MTU size of the GRE tunnel interface
单选题Refer to the exhibit. With an IPSec tunnel established between remote Router A and head-end router B, with Compressed Real-Time Protocol (cRTP) configured on the serial interface of Router A, what impact will the cRTP configuration have on the Voice over IP packets flowing through the IPSec tunnel from a Cisco 7960 IP phone?（）A Twenty bytes of header will be replaced with five bytes. B If the IPSec transform set includes Authentication Header, the receiving IPSec peer will discard the packets. C The IPSec packets will be dropped by Router A's compression logic.D The voice packets will not be compressed.
单选题What is not a difference between VPN tunnel authentication and per-user authentication?（）AVPN tunnel authentication is part of the IKE specification. BVPN tunnel authentication does not control which end user can use the IPSec SA (VPN tunnel).CUser authentication is used to control access for a specific user ID, and can be used with or without a VPN tunnel for network access authorization. D802.1X with EAP-TLS (X.509 certificates) can be used to authenticate an IPSec tunnel.
单选题Which QoS preclassification option will require the use of the qos pre-classify command for the VPN traffic？ （）AVPN traffic needs to be classified based on the Layer2 header informationBVPN traffic needs to be classified based on the IP precedence or DSCPCVPN traffic needs to be classified based on IP flow or Layer 3 information， such as source and destination IP addressDVPN traffic with Authentication Header （AH） needs to preserve the ToS byte
多选题Which three security concerns can be addressed by a tunnel mode IPsec VPN secured by ESP？（）Adata integrityBdata confidentialityCdata authenticationDouter IP header confidentialityEouter IP header authentication
多选题Which three features are benefits of using GRE tunnels in conjunction with IPsec for building site-to-site VPNs？（）Aallows dynamic routing over the tunnelBsupports multi-protocol （non-IP） traffic over the tunnelCreduces IPsec headers overhead since tunnel mode is usedDsimplifies the ACL used in the crypto mapEuses Virtual Tunnel Interface （VTI） to simplify the IPsec VPN configuration
多选题IPSec VPN is a widely-acknowledged solution for enterprise network. Which three IPsec VPNstatements are true？（）AIKE keepalives are unidirectional and sent every ten secondsBIPsec uses the Encapsulating Security Protocol （ESP） or the Authentication Header （AH）protocol for exchanging keysCTo establish IKE SA, main mode utilizes six packets while aggressive mode utilizes only threepacketsDIKE uses the Diffie-Hellman algorithm to generate symmetrical keys to be used by IPsec peers