There is no such thing as Constant Replication, it's proper name is Synchronous replication.
Synchronous replication ensures that data is written to primary and alternate
locations without delay; this results in an up-to-date mirror copy of data
between a primary and a hot site and is often done in the background
automatically. Asynchronous replication includes a slight delay before data is
written to alternate sites; as a result, this is less expensive than synchronous
solutions, but it can cause problems with applications depending upon
database consistency. A B C are all not valid options for me so i'd go with D. Typicaly vague CompTIA question.
Explanation:
Constant Replication
The primary system replicates data changed data blocks continually. Constant replication is also
referred to as "continuous replication." The replication process occurs in the background,
permitting users to access the data without interruption.
Constant replication is different than regular backups, where files must be closed to be
duplicated.
First i thought A should be the answer but: Asynchronous data replication is typically associated with a warm-site disaster recovery model, not a hot-site model. In a hot-site disaster recovery setup, synchronous (or, in this case; constant) replication is more commonly used, where the secondary site is fully operational and mirrors data in real-time from the primary site. so D is correct.
A. Asynchronous.
Asynchronous data replication is typically used in a hot-site disaster recovery model. This is because asynchronous replication does not require an immediate update to the remote site, allowing for a slight delay in replication. This delay is usually acceptable in a hot-site model, where the remote site is already configured and ready to take over in case of a disaster. Option A is the correct answer.
Constant
When constant replication is in use, each time a change is made (data addition, deletion, change, etc.) at the primary site, the same change is written to the secondary site. This results in the secondary site being constantly up-to-date and is generally an expensive option.
CompTIA Server+ Study Guide Exam SK0-005 Chapter 9 Disaster Recovery
Does CompTia use its own exam guides to write the tests? According to their book, chapter 8 page 329, the two types of replication used for a hot site are synchronous and asynchronous. There is no mention anywhere in the text about "constant" replication. I hope they are not sourcing test material from outside of the book that they produced for the purpose of learning these topics.
Constant Replication
The primary system replicates data changed data blocks continually. Constant
replication is also referred to as "continuous replication." The replication process
occurs in the background, permitting users to access the data without interruption.
Constant replication is different than regular backups, where files must be closed
to be duplicated.
Hot sites are actively updated asynchronously. This occurs in real time, and provides a near-mirror image of your production site on your target systems. Standby latencies for hot sites are typically only milliseconds in length, resulting in little to no downtime during failover.
Asynchronous replication is also commonly used in virtual machines (VMs): Some hypervisors include asynchronous replication to allow entire VMs to be replicated to a remote location so the VM can fail over to that location in the event of a disaster. Another common use case for asynchronous replication is storage snapshots for continuous data protection.
https://protostechnologies.com/blog/disaster-recovery/recovery-site-hot-warm-or-cold/
https://blog.purestorage.com/purely-informational/synchronous-replication-vs-aynchronous-replication/#
"Constant" isn't a replication method. The methods are synchronous or asynchronous.
Asynchronous replicates the data at a scheduled time and reduces bandwith, compared to synchronous which replicates date instantly.
Synchronous would be best if you have two live sites. Asynchronous would be used for a hot-site which would only be used for a failover.
It is a replication method...., according to CompTIA. It's a trick questions and I'd probably still pick Constant.. Page 249 Topic 11c (Managing Service and Data Availability - The Office CompTIA Server+ Study Guide Exam Sk0-005)
Constant, Periodic, Asynchronous, Synchronous, Application Consistent, File Locking, Mirroring, BiDi...
The primary system replicates data changed data blocks continually. Constant replication is also referred to as "continuous replication." The replication process occurs in the background, permitting users to access the data without interruption. Constant replication is different than regular backups, where files must be closed to be duplicated.
asynchronous replication, data is sent to the primary storage (a database, for example). Confirmation that the data was written is sent to the client machine. The data is then replicated to the second database server, and it responds to the first database server with a confirmation. The problem arises if the primary server fails. The secondary may not actually have the replicated data, but the client computer believes that it does. The data is then lost.
Reference: The Official CompTIA Server+ Study Guide
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