Free EMC D-ISM-FN-01 Practice Exam with Questions & Answers

In continuous data protection (CDP), journal space stores all the changes made to data over time. The amount of journal space determines the retention window, i.e., how far back in time data can be recovered. A larger journal allows for a longer recovery window.

Amount of space the source and replica volumes require:Relates to storage capacity, not recovery time.

Length of time required to recover the data:Depends on system performance and data size.

Amount of data that can be restored to a specific point:Depends on the changes captured in the journal.

Full Detailed Explanation with Step by Step Solutions:

A standardFibre Channel (FC) frameconsists of several fields in a specific order. The typical sequence for an FC data frame is:

1️⃣Frame header:Contains control and addressing information.

2️⃣Data field:Carries the actual payload (up to 2112 bytes).

3️⃣CRC (Cyclic Redundancy Check):Ensures data integrity of the frame.

The diagram in the exhibit shows exactly this ordering:

SOF (Start of Frame)– marks the beginning of the frame.

1 (Frame header)– the control and addressing info.

2 (Data field)– the main data payload.

3 (CRC)– for error checking.

EOF (End of Frame)– marks the end of the frame.

TheTransport layer (Layer 4)of the OSI model ensures reliable data transfer between systems by providing:

End-to-end connections– manages communication sessions

Sequencing– orders data packets

Integrity– error detection and correction

Session (Layer 5): Manages sessions and controls dialogues between systems.

Data Link (Layer 2): Deals with local network frame delivery.

Presentation (Layer 6): Translates data formats (like encryption, compression).

RAID 5provides acost-effective balancebetween:

Data protection(single parity, can tolerate one disk failure).

Performance(especially read-heavy environments).

Cost(uses fewer drives than RAID 1 or 6 for the same capacity).

RAID 1 (B): Best for read-heavy workloads but doubles the storage needed (mirroring).

RAID 0 (C): No protection against disk failure.

RAID 6 (D): More protection (dual parity), but more write penalty and more disks needed.

RAID 1isdisk mirroring. It writes identical copies of data to two disks simultaneously, providing redundancy.

Minimum of 2 disks (no parity, no striping).

Excellent read performance, write performance equivalent to a single disk.

Providesfault tolerancebecause data is duplicated.

Astub fileis a small placeholder file that remains on primary storage after data has been archived or moved to secondary storage.

Itcontains a pointer or addressof the archived data’s location.

When accessed, the data is transparently retrieved from the archive.

Address of the source fileand other options do not accurately describe a stub file’s purpose.

Confidentialityensures that sensitive data is only accessible to authorized users. This is a primary goal of information security, achieved by:

Access controls(authentication, authorization)

Encryptionto protect data in transit and at rest

Monitoring and auditingto detect unauthorized access

Availability:Ensuring data/services are accessible when needed.

Accountability:Tracking actions of users (audit trails).

Integrity:Protecting data from unauthorized modification.

In Ethernet networking, VLANs (Virtual Local Area Networks) are identified using a 12-bit VLAN ID field in the IEEE 802.1Q standard. Since 12 bits can represent 2¹² = 4096 unique values, the maximum number of VLANs that can be supported is 4096.

1024 and 2048: These values are less than the maximum and represent subsets of possible VLANs.

8192: This exceeds the 12-bit limit and is not supported by the standard.

A screenshot of a computer AI-generated content may be incorrect.

✅Flexible data access method:Object storage can offer multiple ways to access and interact with stored data, such as REST/SOAP APIs (for object-based access) and file-sharing protocols (CIFS, NFS) for file-level access.

✅Metadata-driven policy:Object storage uses rich metadata to define how objects are placed, protected, and managed, driven by policies that respond to service-level requirements.

✅Data protection:Object storage systems implement data protection at a global scale through replication or erasure coding to ensure data durability and availability.

✅Global namespace:Object storage abstracts physical locations, providing a single namespace (a unified view) so that applications can seamlessly access data regardless of where it physically resides.

Rebuilding a RAID 5 array after a disk failure depends on:

Capacity of the failed disk (C)– More data means longer rebuild time.

Write performance of the remaining disks (B)– Rebuild involves recalculating parity and writing data to the replacement disk, which stresses the surviving disks.

Network bandwidth (A)is only relevant for accessing the array, not for internal rebuild operations.

Cache capacity (D)helps performance in some scenarios, but the direct factors are disk size and performance.