IBM认证考试
Two DS8700 systems have been proposed for a disk-to-disk BC solution. Each system has 200 TB installed， with a data change rate of 18% per day. Two 2 Gbps CWDM links are in place between the remote data centers with an average utilization rate of 55%. Th
题目
Two DS8700 systems have been proposed for a disk-to-disk BC solution. Each system has 200 TB installed， with a data change rate of 18% per day. Two 2 Gbps CWDM links are in place between the remote data centers with an average utilization rate of 55%. The proposed solution includes additional CWDM ports. Which of the following should justify the additional CWDM ports（）
- A、the Disk Magic configuration report
- B、an engineer from thetelcom providing the dark fiber
- C、the bandwidth calculations
- D、aCompeteLine analysis
相似问题和答案
第1题：
You are the administrator of a SQL Server 2000 computer. You have two new hard disks on which you will create a database named inventory. You want to insert, update, and delete data as quickly as possible.
Which two actions should you take? (Each correct answer presents parts of the solution. Choose two)
A. Configure the hard disks as two mirrored NTFS volumes.
B. Configure the hard disks as one mirrored NTFS volumes.
C. Configure the hard disks as two independent NTFS volumes.
D. Configure the hard disks as one extended NTFS volume.
E. Place inventory_data.mdf on the first volume and inventory_log.ldf on the second volume.
F. Place inventory_data.mdf on the first volume and inventory_data2.ndf and inventory_log.ldf on the second volume.
G. Place inventory_data.mdf and inventory_log.ldf on the same volume.
C,E 解析：Explanation: Placing log files and the data files on different physical disks or independent volumes, and placing the log file of a drive that does not hold the operating system can improve database performance as it allows the frequently written to log file to exist a disk with its own read/write heads and thus less seek time.
Note: A Windows 2000 supports basic disks, in which physical disks are divided into partitions, and dynamic disks, in which disks are divided into volumes that can comprise an entire disk, two or more entire disks, portions of a disk, or portions of up to 32 physical disks.
A NTFS volume is volume that is formatted with the NTFS file system. Physical database design involves mapping the logical design onto physical media to allow for the data to be physically accessed and maintained as quickly as possible by taking advantage of the available hardware and software features. It is important to correctly design the database and to take advantage of hardware and software features early in the development cycle of a database application, because making changes to these components at a later stage it is difficult.
Incorrect Answers:
A: For redundancy and fault protection the log file can be placed on a mirrored volume. It would not be a good idea to put data files on a mirrored volume though. Performance when accessing the data would suffer.
Note: A mirrored volume is a fault-tolerant volume that duplicates data on two physical disks. It provides data redundancy as it copies the data on one volume to another volume on a different disk. When one of the physical disks fails, the data on the failed disk becomes unavailable, but the system can continue to operate by using the mirror disk. In such a set up, the data file and the log file will reside on the same drive. This will not improve database performance.
B: A mirrored volume cannot comprise of one volume only. It must comprise of two volumes on separate physical disks as a mirrored volume is a fault-tolerant volume that duplicates data on two physical disks. When one of the physical disks fails, the data on the failed disk becomes unavailable, but the system can continue to operate by using the mirror disk.
D: Data is written and read sequentially on extended volumes. As a result the data file and the log file will be placed on the same physical disk.
F: In this scenario the data file is separated into a primary data file, that uses the .mdf extension, and a secondary data file, that uses the .ndf extension. However, the secondary data file is placed on the same volume as the log file. This will lead to performance improvements only in cases where data is not read from the secondary data file.
G: Placing the data file and the log file on the same volume will not improve database performance as it will not allow parallel processing.
第2题：
A customer has ten RS/6000 Model M80， two pSeries 690 Model 681， five POWER5 510 and two POWER6 560 machines installed and running commercial applications. They want to do a server consolidation study in order to replace the existing systems with POWER7 systems. What performance metric is recommended when evaluating the replacement system？（）
- A、IBM CPW
- B、IBM rPerf
- C、SPECint_rate2006
- D、IDEAS International RPE2
正确答案:B
第3题：
In a data communication system, which transport media can be described as following: Has two classes: single mode and multiple mode; with higher transmit rate; with the best reliability
A．radio channel
B．fiber optic cable
C．twisted-pair cable
D．coaxial cable
第4题：
A customer has just obtained a second data center through the acquisition of a competitor. The IT Director is now seeking to merge，integrate，and rebalance systems across the two data centers over thenext two years. They have just deployed a high-speed point-to-point circuit between the facilities. The IT Director would like a system that could backup their AIX and Win2K servers and electronically vault the data between sites as part of their Disaster Recovery Plan. What product should the pSeries technical specialist recommend for this requirement？（）
- A、CSM
- B、TSM
- C、NIM
- D、Sysback
正确答案:B
第5题：
Which two statements are true about the digital audio in a VoIP network？ （）
- A、 Standard encoding techniques create an uncompressed digital data rate of 4000 bps.
- B、 Standard encoding techniques create an uncompressed digital data rate of 8000 bps.
- C、 Standard encoding techniques create an uncompressed digital data rate of 64，000 bps.
- D、 Voice quality is not a concern if compression is not used.
- E、 Two methods of quantization are linear and logarithmic.
- F、 Two methods of compression are u-law and a-law.
正确答案:C,E
第6题：
A financial customer has three data centers that are approximately five kilometers apart. Their SAP application data needs to be kept synchronized within 10 milliseconds between the three sites.Which of the following solutions satisfies the customer‘s recovery time objective?（）
A. DS8700 systems at each site running Metro Mirror
B. DS5300 systems at each site running Metro Mirror
C. DS5100 systems at each site running Global Mirror
D. XIV systems at each site running synchronous mirroring
第7题：
Which two statements are correct regarding multicast implementation using a WLAN controller (v5.2) and AP?（）
- A、Multicast traffic is sent out on Cisco APs at the highest mandatory data rate.
- B、Multicast traffic is sent out on Cisco APs at the highest supported data rate.
- C、On Cisco APs， multicast traffic and beacons are sent out at the same data rates to maintain a common cell size for normal data as well as multicast data.
- D、If there is more than one mandatory data rate， multicast traffic will be sent at the highest mandatory rate and beacons will be sent at the lowest mandatory rate.
- E、On Cisco APs， multicast traffic will be sent out at the highest data rate that a client can maintain with the AP.
正确答案:A,D
第8题：
You are the administrator of a SQL Server 2000 database. You import a table of geographic information from a Microsoft access database into a SQL Server 2000 database. The table has 12,000 rows. Each row averages 5,000 bytes. The table contains lockup data that does not change.
You want to minimize the size of the data file and the time required to back up the data. Which two actions should you take? (Each correct answer presents part of the solution. Choose two)
A. Create a 60-MB data file named geography.ndf
B. Create a 95-MB data file named geography.ndf
C. Create a 60-MB data file named geography.mdf
D. Create a 95-MB data file named geography.mdf
E. Place the table in the PRIMARY filegroup.
F. Place the table in a new filegroup named LOCATION.
B,F 解析：Explanation: As SQL Server 2000 supports backing up or restoring individual files or file groups within a database, it is possible to reduce back up time by creating a separate data file table so that only that table will be backed up. This separate data file will have to be a secondary data file because a database can only have one primary data file, which is identified by the .mdf extension, it is the starting point of the database and locates all the other files in the database. Secondary data files are identified by the .ndf extension and comprise all of the data files except the primary data file. A database need not have a secondary data file and it is also possible to create multiple secondary data files on database.
Rows are stored in data pages. Rows cannot cross different data pages. The size of data page in SQL Server 2000 (or SQL 7.0) is 8,192 bytes. We can only store one row in every data page in this scenario. Thus, to estimate the size of the tale we would need to multiply the number of rows, 12,000 in this scenario, by 8,192 bytes. This will give us a table size of 98,304,000 bytes. As computer data storage is calculated using the binary rather than the decimal system, there is 1,024 bytes per Kb and 1,024 Kb per MB, rather than 1,000 bytes per Kb and 1,000 Kb per MB, we thus require a database size of at least 93.75 MB.
Incorrect Answers:
A: The data size of this table is insufficient as a minimum size of 93.75 MB is required.
C: The data size of this table is insufficient as a minimum size of 93.75 MB is required. Furthermore, the .mdf file extension indicate in this solution implies that the data file will be placed in the primary filegroup. It would thus not be possible to backup the data file pertaining to the table only.
D: The .mdf file extension indicate in this solution implies that the data file will be placed in the primary filegroup. It would thus not be possible to backup the data file pertaining to the table only.
E: As SQL Server 2000 supports backing up or restoring individual files or file groups within a database, it is possible to reduce back up time by creating a separate data file table so that only that table will be backed up. This separate data file will have to be a secondary data file because a database can only have one primary data file, which is identified by the .mdf extension, it is the starting point of the database and locates all the other files in the database.
第9题：
A bank has requested proposals for a storage solution to upgrade their disaster recovery processes for their IBM System z， UNIX， and Microsoft Windows environment. The solution must simulate a multi-site environment and provide the customer the ability to evaluate Metro Mirror， Global Mirror， Global Mirror for z/OS， and FlashCopy. 120 TB physical capacity is required per site. Only Fibre Channel drives can be used. Which solution best meets the specified requirements（）
- A、two DS8700 systems with two-way processor cards and 600 GB FC drives
- B、two DS8700 systems with four-way processor cards and LPAR
- C、two DS8700 systems with two-way processor cards and two frames per system
- D、two DS8700 systems with four-way processor cards and two frames per system
正确答案:D
第10题：
A finance company needs to increase its storage but has run out of floor space in the data center.Currently they have two ESS 800 systems with a total of 125 TB of System z data. Which of thefollowing IBM System Storage products would allow them to replace the ESS 800 systems,increase their performance, reduce their floor space, and still allow them room to grow?（）
- A、N5200
- B、DS5020
- C、DS5300
- D、DS8700
正确答案:D