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NEW QUESTION: 1
Which option is a characteristic of a stateful firewall?
A. allows modification of security rule sets in real time to allow return traffic
B. can analyze traffic at the application layer
C. supports user authentication
D. will allow outbound communication, but return traffic must be explicitly permitted
Answer: A
Explanation:
http://www.cisco.com/en/US/docs/security/security_management/cisco_security_manager/ security_manager/4.1/user/guide/fwinsp.html
Understanding Inspection Rules Inspection rules configure Context-Based Access Control (CBAC) inspection commands. CBAC inspects traffic that travels through the device to discover and manage state information for TCP and UDP sessions. The device uses this state information to create temporary openings to allow return traffic and additional data connections for permissible sessions. CBAC creates temporary openings in access lists at firewall interfaces. These openings are created when inspected traffic exits your internal network through the firewall. The openings allow returning traffic (that would normally be blocked) and additional data channels to enter your internal network back through the firewall. The traffic is allowed back through the firewall only if it is part of the same session as the original traffic that triggered inspection when exiting through the firewall.
Inspection rules are applied after your access rules, so any traffic that you deny in the access rule is not inspected. The traffic must be allowed by the access rules at both the input and output interfaces to be inspected. Whereas access rules allow you to control connections at layer 3 (network, IP) or 4 (transport, TCP or UDP protocol), you can use inspection rules to control traffic using application-layer protocol session information. For all protocols, when you inspect the protocol, the device provides the following functions:
Automatically opens a return path for the traffic (reversing the source and destination addresses), so that you do not need to create an access rule to allow the return traffic. Each connection is considered a session, and the device maintains session state information and allows return traffic only for valid sessions. Protocols that use TCP contain explicit session information, whereas for UDP applications, the device models the equivalent of a session based on the source and destination addresses and the closeness in time of a sequence of UDP packets. These temporary access lists are created dynamically and are removed at the end of a session.
Tracks sequence numbers in all TCP packets and drops those packets with sequence numbers that are not within expected ranges.
Uses timeout and threshold values to manage session state information, helping to determine when to drop sessions that do not become fully established. When a session is dropped, or reset, the device informs both the source and destination of the session to reset the connection, freeing up resources and helping to mitigate potential Denial of Service (DoS) attacks.
NEW QUESTION: 2
Huawei V3 series storage system hardware includes controller enclosures and disk enclosures.
Which of the following statements about controller enclosures is correct?
A. If BBUs become faulty, the service system will be interrupted.
B. When the external power supply fails, BBUS ca n supply power to enable data synchronization from the cache to disks in disk enclosures.
C. When the power input is normal, BBUS are in the standby state.
D. When the external power supply fails, BBLJ mod u les provide backup power for all disks.
Answer: B
NEW QUESTION: 3
A. Option C
B. Option D
C. Option A
D. Option B
Answer: B,C