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NEW QUESTION: 1
Which STP protocol is the default that is enabled on Cisco Nexus switches?
A. RSTP (802.lw)
B. STP (802.ld)
C. Rapid PVST +
D. MST {802.ls)
Answer: C

NEW QUESTION: 2
A potential problem related to the physical installation of the Iris Scanner in regards to the usage of the iris pattern within a biometric system is:
A. The optical unit must be positioned so that the sun does not shine into the aperture.
B. Concern that the laser beam may cause eye damage.
C. There is a relatively high rate of false accepts.
D. The iris pattern changes as a person grows older.
Answer: A
Explanation:
Because the optical unit utilizes a camera and infrared light to create the images, sun light can impact the aperture so it must not be positioned in direct light of any type. Because the subject does not need to have direct contact with the optical reader, direct light can impact the reader.
An Iris recognition is a form of biometrics that is based on the uniqueness of a subject's iris.
A camera like device records the patterns of the iris creating what is known as Iriscode.
It is the unique patterns of the iris that allow it to be one of the most accurate forms of biometric identification of an individual. Unlike other types of biometics, the iris rarely changes over time. Fingerprints can change over time due to scaring and manual labor, voice patterns can change due to a variety of causes, hand geometry can also change as well. But barring surgery or an accident it is not usual for an iris to change. The subject has a high-resoulution image taken of their iris and this is then converted to Iriscode. The current standard for the Iriscode was developed by John Daugman. When the subject attempts to be authenticated an infrared light is used to capture the iris image and this image is then compared to the Iriscode. If there is a match the subject's identity is confirmed. The subject does not need to have direct contact with the optical reader so it is a less invasive means of authentication then retinal scanning would be.
Reference(s) used for this question:
AIO, 3rd edition, Access Control, p 134
AIO, 4th edition, Access Control, p 182
Wikipedia - http://en.wikipedia.org/wiki/Iris_recognition
The following answers are incorrect:
Concern that the laser beam may cause eye damage. The optical readers do not use laser so, concern that the laser beam may cause eye damage is not an issue.
The iris pattern changes as a person grows older. The question asked about the physical installation of the scanner, so this was not the best answer. If the question would have been about long term problems then it could have been the best choice. Recent research has shown that Irises actually do change over time: http://www.nature.com/news/ageing- eyes-hinder-biometric-scans-110722
There is a relatively high rate of false accepts. Since the advent of the Iriscode there is a very low rate of false accepts, in fact the algorithm used has never had a false match. This all depends on the quality of the equipment used but because of the uniqueness of the iris even when comparing identical twins, iris patterns are unique.

NEW QUESTION: 3
Your database supports an online transaction processing (OLTP) application. The application is undergoing some major schema changes, such as addition of new indexes and materialized views. You want to check the impact of these changes on workload performance.
What should you use to achieve this?
A. SQL Tuning Advisor
B. SQL Performance Analyzer
C. SQL Access Advisor
D. Automatic Workload Repository compare reports
E. Database replay
Answer: B
Explanation:
You can use the SQL Performance Analyzer to analyze the SQL performance impact of any type of system change. Examples of common system changes include:
* Database upgrades
* Configuration changes to the operating system, hardware, or database
* Database initialization parameter changes
* Schema changes, such as adding new indexes or materialized views
* Gathering optimizer statistics
* SQL tuning actions, such as creating SQL profiles
References:
http://docs.oracle.com/cd/B28359_01/server.111/b28318/intro.htm#CNCPT961