多项选择题

WhenimplementingWLANsecurity，whatarethreebenefitsofusin……

When implementing WLAN security， what are three benefits of using the Temporal Key Integrity Protocol （TKIP） instead of WEP？（）

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

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多项选择题WhichthreestatementsregardingCiscoASAmulticastroutingsupportarecorrect？（）

A. ASA supports both stubmulticast routing and PIMmulticast routing. However， you cannot configure bothconcurrently on a single security appliance
B. When configured for stubmulticast routing， the ASA can act as the Rendezvous Point （RP）
C. If the ASAdetects IGMPversion1 routers， the ASAwill automatically switch to IGMP version 1 operations.
D. The ASA supports both PIM-SM and bi-directional PIM
E. Enabling multicast routing globally on the ASA automatically enables PIM and IGMP on all interfaces
F. The ASA can be configured for IGMP snooping toconstrain theflooding of multicast traffic by dynamically configuring themulticast traffic to be forwarded only those interfaces associated with hosts requesting themulticast group

单项选择题ThekeylengthsforDESand3DES，respectively，are：（）

A. 128 bits and 256 bits
B. 128 bits and 384 bits
C. 1024 bits and 3072bits
D. 64 bits and 192 bits
E. 56 bits and 168 bits
F. 128 bytes and 384 bytes

多项选择题WhichalgorithmsdidTKIPaddtothe802.11specification？（）

A. key mixing
B. AES-based encryption
C. anti-replay sequence counter
D. message integrity check
E. cyclic redundancy check

多项选择题WheneverafailovertakesplaceontheASA（configuredforfailover），allactiveconnectionsaredroppedandclientsmustre-establishtheirconnectionsunless：（）

A. The ASA is configured for Active-Standby failover.
B. The ASA is configured for Active-Activefailover.
C. The ASA is configured for Active-Active failover and a state failover link has been configured.
D. The ASA is configured for Active-Standby failover and a state failover link has been configured.
E. The ASA is configured to use a serial cable as the failover link.
F. The ASA is configured for LAN-Based failover

多项选择题WhattwothingsmustyoudoontherouterbeforegeneratinganSSHkeywiththe cryptokeygeneratersa IOScommand？（）

A. Configure the SSH version that the router will use
B. Configure the host name of the router
C. Enable AAA Authentication
D. Configure the default IP domain name that the router will use
E. Enable SSH transport support onthe vty lines