Pass the EMC DCA-ISM D-ISM-FN-01 Questions and answers with CertsForce

The exhibit shows a Fibre Channel (FC) switch connected to another FC switch. The port "X" is used for inter-switch link (ISL) connectivity, which is characteristic of anE_port (Expansion Port).

F_port (Fabric port):Connects an N_port (host or storage device) to a switch.

N_port (Node port):End device port in FC networks (like HBA in hosts or storage).

NL_port (Node Loop port):Used for Arbitrated Loop topologies.

E_port:Connects two FC switches together for ISL, which is exactly what's shown in the exhibit.

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.

Log files record events and messages related to the operations of a virtual machine. They provide detailed information about the VM's behavior, errors, and system messages, which are crucial for troubleshooting.

Vendor ready solutions(like Dell VxRail or HCI appliances) are pre-integrated and pre-tested by the vendor, providing:

Faster deployment.

Simplified management.

Reduced integration effort compared to DIY solutions.

DCaaS(Data Center as a Service) is a managed service, not an on-prem solution.

DIYinvolves separate purchases and integrations by IT teams.

Service-based approachrefers to cloud models or managed services.

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.

5Grepresents the fifth generation of mobile networks and offers several significant advantages over 4G, 3G, and earlier generations:

Increased speed:5G delivers data speeds up to 100 times faster than 4G LTE.

Enhanced capacity:Supports more devices per square kilometer, crucial for IoT and smart cities.

Low latency:Reduces delay in data transmission, enabling real-time applications like remote surgeries or autonomous vehicles.

Increased bandwidth(Option B) is part of the overall increased capacity.

Reduced distance(Option C) is incorrect; 5G uses shorter wavelengths, meaning shorter range.

Lower cost(Option D) is not a key advantage of 5G technology itself.

Anincidentis anunplanned disruptionof a service or a reduction in its quality, often with anunknown root cause.

Incidents require immediate action to restore service.

Example: SAN switch port down, unexpected storage latency.

Support requestsare typically service requests, not incidents.

Impact actionsare more about changes, not incidents.

Events preventing correctionsmight be problems, not incidents.

Using SSDs as asecondary cache(sometimes called a “flash cache”) helps:

Improve read performanceby storing frequently accessed data in the faster SSDs.

Reduce latency for read requests because SSDs are much faster than traditional spinning hard drives (HDDs).

Power consumption (A): SSDs do use less power, but the primary goal here is performance.

Data backup (C): SSD cache doesn’t impact backup operations.

Storage capacity (D): This is not the main focus; the SSDs act as a cache layer only.