單項選擇題The key lengths for DES and 3DES， 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


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1.多項選擇題Which algorithms did TKIP add to the 802.11 specification？ （）

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

2.多項選擇題Whenever a failover takes place on the ASA （configured for failover）， all active connections are droppedand clients must re-establish their connections unless： （）

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

3.多項選擇題Whattwo things must you do onthe router before generating an SSH key with the "crypto key generate rsa"IOS command？ （）

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

4.單項選擇題What is the main reason for using the "ip ips deny-action ips-interface" IOS command？（）

A. To selectively apply drop actions to specific interfaces
B. To enable IOS to droptraffic for signatures configured with the Drop action
C. To support load-balancing configurations in which traffic can arrive via multipleinterfaces 
D. This is nota valid IOS command

5.多項選擇題Which of the following is true about the Cisco IOS-IPS functionality？ （）

A. The signatures available are built into the IOS code.
B. Toupdate signatures youneed to install a new IOS image
C. To activate new signatures you download a new Signature DefiitionFile （SDF） from Cisco’s web site
D. Loading and enabling selected IPS signatures is user configurable
E. Cisco IOS onlyprovides Intrusion Detection functionality
F. Cisco IOS-IPS requires a network module installed in your router running sensor software