EMC E10-001 Online Practice Questions and Exam Preparation

EMC E10-001 Online Questions & Answers

• Question 251:

  What is an advantage of synchronous remote replication compared to other remote replication methods?

  A. Near zero RPO
  B. Near zero RTO
  C. No distance limitation
  D. Faster response time
  A. Near zero RPO

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  Synchronous Replication

  

  In synchronous remote replication, writes must be committed to the source and remote replica (or target), prior to acknowledging "write complete" to the host. Additional writes on the source cannot occur until each preceding write has been

  completed and acknowledged.

  This ensures that data is identical on the source and replica at all times. Further, writes are transmitted to the remote site exactly in the order in which they are received at the source.

  Therefore, write ordering is maintained. If a source-site failure occurs, synchronous remote replication provides zero or near-zero recovery-point objective (RPO).

  EMC E10-001 Student Resource Guide

  Module 12: Remote Replication

• Question 252:

  Which data protection technology provides the highest degree of protection against logical corruption and a near-zero RPO?

  A. CDP
  B. Mirroring
  C. Backup-to-disk
  D. Snapshots with CoFW
  A. CDP

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  Continuous Data Protection In network-based replication, the replication occurs at the network layer between the hosts and storage arrays. Network-based replication combines the benefits of array-based and host-based replications. By offloading replication from servers and arrays, network-based replication can work across a large number of server platforms and storage arrays, making it ideal for highly heterogeneous environments. Continuous data protection (CDP) is a technology used for network-based local and remote replications. In a data center environment, mission-critical applications often require instant and unlimited data recovery points. Traditional data protection technologies offer limited recovery points. If data loss occurs, the system can be rolled back only to the last available recovery point. Mirroring offers continuous replication; however, if logical corruption occurs to the production data, the error might propagate to the mirror, which makes the replica unusable. In normal operation, CDP provides the ability to restore data to any previous PIT. It enables this capability by tracking all the changes to the production devices and maintaining consistent point-in-time images.

  In CDP, data changes are continuously captured and stored in a separate location from the primary storage. Moreover, RPOs are random and do not need to be defined in advance.

  With CDP, recovery from data corruption poses no problem because it allows going back to a PIT image prior to the data corruption incident. EMC E10-001 Student Resource Guide. Module 11: Local Replication

• Question 253:

  Refer to the exhibit.

  

  The exhibit reflects the encapsulation order in an iSCSI environment. What do the labels "X" and "Y" represent?

  A. X = TCP Y = iSCSI
  B. X = iSCSI Y = TCP
  C. X = FCIP Y = iSCSI
  D. X = iSCSI Y = FCoE
  A. X = TCP Y = iSCSI

• Question 254:

  In an FC SAN environment, an administrator wants to prevent unauthorized nodes from accessing a switch. What enables the administrator to specify which node ports can access the switch?

  A. Access Control List
  B. Fabric Binding
  C. Persistent Port Disable
  D. Role-based Access Control
  A. Access Control List

• Question 255:

  Which technique prevents hosts from gaining unauthorized access to storage volumes in a shared storage environment?

  A. LUN masking
  B. Zoning
  C. Fabric binding
  D. Concatenating metaLUNs
  A. LUN masking

• Question 256:

  An administrator has defined a backup policy to perform full backups at 8 P.M. every Monday and incremental backups at 8 P.M. on the remaining week days. How many backup copies are required to restore the data if it was accidentally deleted on Friday morning?

  A. 1
  B. 2
  C. 3
  D. 4
  D. 4

• Question 257:

  Which EMC product provides inherent source-based deduplication?

  A. Avamar
  B. Data Domain
  C. VMAX
  D. VNX
  A. Avamar

• Question 258:

  You must create a chargeback system for cost recovery in the IT department. Which activity supports this goal?

  A. Capacity planning
  B. Monitoring
  C. Provisioning
  D. Reporting
  D. Reporting

• Question 259:

  What is a function of unified management software?

  A. Automates the creation of cloud services based on pre-defined service attributes
  B. Authenticates consumers and forwards their requests to the user access management software
  C. Provides a self-service interface to consumers to view and provision cloud services
  D. Enables consumers to view and manage physical and virtual resources centrally
  A. Automates the creation of cloud services based on pre-defined service attributes

• Question 260:

  What defines the time taken to position the sector on the platter under the read/write head?

  A. Rotational delay
  B. Seek time
  C. Response time
  D. Data transfer rate
  A. Rotational delay

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  Rotational Latency To access data, the actuator arm moves the R/W head over the platter to a particular track while the platter spins to position the requested sector under the R/W head. The time taken by the platter to rotate and position the data under the R/ W head is called rotational latency. This latency depends on the rotation speed of the spindle and is measured in milliseconds. The average rotational latency is one-half of the time taken for a full rotation. Similar to the seek time, rotational latency has more impact on the reading/writing of random sectors on the disk than on the same operations on adjacent sectors. Average rotational latency is approximately 5.5 ms for a 5,400-rpm drive, and around 2.0 ms for a 15,000- rpm (or 250-rps revolution per second) drive as shown here. Av. rotational latency for 15K rpm or 250 rps (15000/60) drive is = (1/2)/250=2 milliseconds.

  EMC E10-001 Student Resource Guide. Module 2: Data Center Environment