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NEW QUESTION: 1
On your Oracle Database, you issue the following commands to create indexes:
SQL > CREATE INDEX oe.ord_customer_ix1 ON or-orders (customer_id,
sales_rep_id) INVISIBLE;
SQL> CREATE BITMAP INDEX oe.ord_customer_ix2 ON oe.orders (customer_id, sales_rep_id); Which two statements are true?
A. Both the indexes are created: however, only ORD_CUSTOMERS_IX1 is used by the optimizer for queries on the ORDERS table.
B. Both the indexes are created: however, only ORD_CUSTOMERS_IX2 is used by the optimizer for queries on the ORDERS table.
C. Both the indexes are updated when a row is inserted, updated, or deleted in the ORDERS table.
D. Both the indexes are created and used by the optimizer for queries on the ORDERS table.
E. Only the ORD_CUSTOMER_IX1 index created.
F. The ORD_CUSTOMER_IX1 index is not used by the optimizer even when the OPTIMIZER_USE_INVISIBLE_INDEXES parameters is set to true.
Answer: B,C
Explanation:
Not A: Both indexes are created fine.
B: The invisible index ORD_CUSTOMERS_IX1 and the bitmap index are both updated by DML operations on the Orders table.
F: Since ORD_CUSTOMERS_IX1 is invisible only ORD_CUSTOMERS_IX2 is used by the query optimizer.
Not C,Not D,Not E:
* ord_customer_ix1 is an invisible index and is therefore not used by the optimizer.
* VISIBLE | INVISIBLE Use this clause to specify whether the index is visible or invisible to the optimizer. An invisible index is maintained by DML operations, but it is not be used by the optimizer during queries unless you explicitly set the parameter OPTIMIZER_USE_INVISIBLE_INDEXES to TRUE at the session or system level.
Note: Specify BITMAP to indicate that index is to be created with a bitmap for each distinct key, rather than indexing each row separately. Bitmap indexes store the rowids associated with a key value as a bitmap. Each bit in the bitmap corresponds to a possible rowid. If the bit is set, then it means that the row with the corresponding rowid contains the key value.
The internal representation of bitmaps is best suited for applications with low levels of concurrent transactions, such as data warehousing.
NEW QUESTION: 2
Your network contains an Active Directory domain named contoso.com. The domain contains a domain controller named DC1 that runs Windows Server 2012 R2. DC1 has the DNS Server server role installed.
The network contains client computers that run either Linux, Windows 7, or Windows 8.
You have a zone named adatum.com as shown in the exhibit. (Click the Exhibit button.)
You plan to configure Name Protection on all of the DHCP servers.
You need to configure the adatum.com zone to support Name Protection.
What should you do?
A. Add a DNSKEY record.
B. Configure Dynamic updates.
C. Change the zone type.
D. Sign the zone.
Answer: B
Explanation:
Name protection requires secure update to work. Without name protection DNS names may be hijacked.
You can use the following procedures to allow only secure dynamic updates for a zone. Secure dynamic update is supported only for Active Directory-integrated zones. If the zone type is configured differently, you must change the zone type and directory-integrate the zone before securing it for Domain Name System (DNS) dynamic updates.
Enable secure dynamic updates:
Reference: DHCP: Secure DNS updates should be configured if Name Protection is enabled on any IPv4 scope
http://technet.microsoft.com/en-us/library/ee941152(v=ws.10).aspx
NEW QUESTION: 3
What is a decrease in amplitude as a signal propagates along a transmission medium best known as?
A. Attenuation
B. Delay distortion
C. Noise
D. Crosstalk
Answer: A
Explanation:
Attenuation is the loss of signal strength as it travels. The longer a cable, the more at tenuation occurs, which causes the signal carrying the data to deteriorate. This is why standards include suggested cable-run lengths. If a networking cable is too long, attenuation may occur. Basically, the data are in the form of electrons, and these electrons have to "swim" through a copper wire. However, this is more like swimming upstream, because there is a lot of resistance on the electrons working in this media. After a certain distance, the electrons start to slow down and their encoding format loses form. If the form gets too degraded, the receiving system cannot interpret them any longer. If a network administrator needs to run a cable longer than its recommended segment length, she needs to insert a repeater or some type of device that will amplify the signal and ensure it gets to its destination in the right encoding format. Attenuation can also be caused by cable breaks and malfunctions. This is why cables should be tested. If a cable is suspected of attenuation problems, cable testers can inject signals into the cable and read the results at the end of the cable.
The following answers are incorrect:
Crosstalk - Crosstalk is one example of noise where unwanted electrical coupling between adjacent lines causes the signal in one wire to be picked up by the signal in an adjacent wire.
Noise - Noise is also a signal degradation but it refers to a large amount of electrical fluctuation that can interfere with the interpretation of the signal by the receiver.
Delay distortion - Delay distortion can result in a misinterpretation of a signal that results from transmitting a digital signal with varying frequency components. The various components arrive at the receiver with varying delays.
Following reference(s) were/was used to create this question:
CISA review manual 2014 Page number 265 Official ISC2 guide to CISSP CBK 3rd Edition Page number 229 & CISSP All-In-One Exam guide 6th Edition Page Number 561
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