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NEW QUESTION: 1
How can an EBS volume that is currently attached to an EC2 instance be migrated from one Availability Zone to another?
A. Detach the volume and attach it to another EC2 instance in the other AZ.
B. Simply create a new volume in the other AZ and specify the original volume as the source.
C. Detach the volume, then use the ec2-migrate-volume command to move it to another AZ.
D. Create a snapshot of the volume, and create a new volume from the snapshot in the other AZ.
Answer: D
Explanation:
Explanation
Snapshots can be used to create multiple new EBS volumes, expand the size of a volume, or move volumes across Availability Zones.
See:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSVolumes.html

NEW QUESTION: 2
What is the 802.11 standard related to?
A. Public Key Infrastructure (PKI)
B. The OSI/ISO model
C. Packet-switching technology
D. Wireless network communications
Answer: D
Explanation:
Explanation/Reference:
The 802.11 standard outlines how wireless clients and APs communicate, lays out the specifications of their interfaces, dictates how signal transmission should take place, and describes how authentication, association, and security should be implemeted.
The following answers are incorrect:
Public Key Infrastructure (PKI) Public Key Infrastructure is a supporting infrastructure to manage public keys. It is not part of the IEEE 802 Working Group standard.
Packet-switching technology A packet-switching technology is not included in the IEEE 802 Working Group standard. It is a technology where-in messages are broken up into packets, which then travel along different routes to the destination.
The OSI/ISO model The Open System Interconnect model is a sevel-layer model defined as an international standard describing network communications.
The following reference(s) were/was used to create this question:
Source: Shon Harris - "All-in-One CISSP Exam Guide" Fourth Edition; Chapter 7 - Telecommunications and Network Security: pg. 624.
802.11 refers to a family of specifications developed by the IEEE for Wireless LAN technology. 802.11 specifies an over-the-air interface between a wireless client and a base station or between two wireless clients. The IEEE accepted the specification in 1997. There are several specifications in the 802.11 family:
802.11 # applies to wireless LANs and provides 1 or 2 Mbps transmission in the 2.4 GHz band using either frequency hopping spread spectrum (FHSS) or direct sequence spread spectrum (DSSS).
802.11a # an extension to 802.11 that applies to wireless LANs and provides up to 54 Mbps in the 5GHz band. 802.11a uses an orthogonal frequency division multiplexing encoding scheme rather than FHSS or DSSS.
802.11b (also referred to as 802.11 High Rate or Wi-Fi) # an extension to 802.11 that applies to wireless LANS and provides 11 Mbps transmission (with a fallback to 5.5, 2 and 1 Mbps) in the 2.4 GHz band.
802.11b uses only DSSS. 802.11b was a 1999 ratification to the original 802.11 standard, allowing wireless functionality comparable to Ethernet.
802.11g # applies to wireless LANs and provides 20+ Mbps in the 2.4 GHz band.
Source: 802.11 Planet's web site.

NEW QUESTION: 3
Examine the parameters for your database instance:

Which three statements are true about the process of automatic optimization by using cardinality feedback? (Choose three.)
A. The optimizer enables monitoring for cardinality feedback after the first execution of a query.
B. After the optimizer identifies a query as a re-optimization candidate, statistics collected by the collectors are submitted to the optimizer.
C. The optimizer does not monitor cardinality feedback if dynamic sampling and multicolumn statistics are enabled.
D. The optimizer can re optimize a query only once using cardinality feedback.
E. The optimizer automatically changes a plan during subsequent execution of a SQL statement if there is a huge difference in optimizer estimates and execution statistics.
Answer: A,C,E
Explanation:
Explanation/Reference:
Explanation:
C: During the first execution of a SQL statement, an execution plan is generated as usual.
D: if multi-column statistics are not present for the relevant combination of columns, the optimizer can fall back on cardinality feedback.
(not B)* Cardinality feedback. This feature, enabled by default in 11.2, is intended to improve plans for repeated executions.
optimizer_dynamic_sampling
optimizer_features_enable
* dynamic sampling or multi-column statistics allow the optimizer to more accurately estimate selectivity of conjunctive predicates.
Note:
* OPTIMIZER_DYNAMIC_SAMPLING controls the level of dynamic sampling performed by the optimizer.
Range of values. 0 to 10
* Cardinality feedback was introduced in Oracle Database 11gR2. The purpose of this feature is to automatically improve plans for queries that are executed repeatedly, for which the optimizer does not estimate cardinalities in the plan properly. The optimizer may misestimate cardinalities for a variety of reasons, such as missing or inaccurate statistics, or complex predicates. Whatever the reason for the misestimate, cardinality feedback may be able to help.