642-552 - Real IT Certification Training: Pass Exam & Get Certified

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QUESTION 72
By default, what will a router do with incoming network traffic when the Cisco IOS IPS software fails to build a SME?
A. scan traffic using the most recently installed SME
B. drop all packets destined for that SME
C. print a syslog message indicating that failure of the SME build
D. pass traffic packets destined for that SME without scanning them

Correct Answer: D Section: (none) Explanation
Explanation/Reference:
Explanation: Cisco IOS IPS uses signature microengines (SMEs) to load the SDF and scan signatures. Signatures contained within the SDF are handled by a variety of SMEs. The SDF typically contains signature definitions for multiple engines. The SME typically corresponds to the protocol in which the signature occurs and looks for malicious activity in that protocol. A packet is processed by several SMEs. Each SME scans for various conditions that can lead to a signature pattern match. When an SME scans the packets, it extracts certain values, searching for patterns within the packet via the regular expression engine. Example of Alarm Message: %IPS-5-PACKET_UNSCANNED:SERVICE.DNS -packets passed unscanned while engine is building It means Packets are passing through the network but are not being scanned because the specified IPS module is not functioning and the ipips fail closed command is not configured. The message is rate limited to 1 message per 60seconds
QUESTION 73
What isthe difference between the attack-drop.s

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QUESTION 35
Which three ways can AAA services be implemented for Cisco routers? (Choose three.)
A. self-contained AAA services in the router itself
B. Cisco Secure ACS Network Module
C. Cisco Secure ACS Solution Engine
D. Cisco Security Manager AAA Service Module
E. Cisco Secure ACS for Windows Servers
F. Cisco Security Manager ACS Service Module

Correct Answer: ACE Section: (none) Explanation
Explanation/Reference:
Explanation: Authentication, authorization, and accounting (AAA) is a way to control who is allowed to access your network (authenticate), what they can do while they are there (authorize), and to audit what actions they performed while accessing the network (accounting). AAA can be used in Internet Protocol Security (IPSec) to provide preshared keys during the Internet Security Association and Key Management Protocol (ISAKMP) process or to provide per-user authentication, known as XAUTH, during ISAKMP. AAA can be used to provide a mechanism for authorizing commands that administrators enter at the command line of a Cisco device. This is called command-line authorization. AAA is also seen in a Virtual Private Dial-Up Networking (VPDN) tunnel set up between two routers.