DEA-1TT5 Cheat Sheet 2026

The 30 highest-yield DEA-1TT5 facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which replication topology involves a single source replicating to multiple separate target sites? → Fan-out replication
2. What storage protocol is used by the NVMe-oF (NVMe over Fabrics) specification? → NVMe commands transported over Fibre Channel, RDMA, or TCP fabrics
3. What does 'delta replication' refer to in storage systems? → Replicating only the changed blocks or files since the last replication cycle
4. What does Recovery Time Objective (RTO) measure in a replication and disaster recovery context? → The maximum tolerable time to restore operations after a disaster
5. What is a 'recovery point' in backup terminology? → A specific point in time to which data can be restored from a backup or snapshot
6. Which term describes the practice of moving data between storage tiers automatically based on access patterns? → Automated Storage Tiering (AST)
7. Which type of replication captures the state of source data at a specific moment and sends that snapshot image to the target? → Point-in-time (PIT) replication
8. What is the function of a Host Bus Adapter (HBA) in a storage network? → It connects a server to a storage network such as Fibre Channel or iSCSI
9. Which storage term refers to the maximum amount of data that can be transferred per unit of time? → Throughput
10. What is 'bi-directional replication' in a two-site storage configuration? → A configuration where each site acts as both a source and a target for the other site
11. What is the role of cache in a storage array? → To temporarily hold data in fast memory to accelerate read and write operations
12. What does the '3-2-1 backup rule' recommend? → 3 copies of data, on 2 different media types, with 1 copy stored offsite
13. In a NAS environment, what is an 'export' or 'share'? → A network-accessible directory or file system made available to clients by the NAS server
14. What is 'WWPN' in Fibre Channel networking? → World Wide Port Name — a globally unique 64-bit identifier assigned to each FC port
15. In RAID 5, how is parity information stored? → Distributed across all disks in the array
16. What is 'LUN masking' in a SAN environment? → A method to restrict which host initiators can access specific LUNs on the storage array
17. What is 'copyback' in a RAID context? → Migrating rebuilt data from a hot spare back to a new permanent replacement disk
18. What is the purpose of a storage controller in a storage array? → To manage data placement, caching, and I/O operations between hosts and disks
19. What is the primary advantage of RAID 10 over RAID 5? → RAID 10 provides better write performance and faster rebuild times due to mirroring
20. What is 'storage vMotion' in VMware vSphere? → Migrating a running VM's disk files from one datastore to another without powering it off
21. Which of the following best describes 'tiered storage'? → Organizing data across different storage media based on performance needs and cost
22. What is the purpose of 'splitting' or 'fracturing' a replication pair? → To disconnect the target from the source so the replica can be accessed independently
23. What is 'thin provisioning' in storage management? → Allocating storage space on demand rather than pre-allocating the full requested capacity
24. Which backup topology uses a dedicated storage network to connect backup servers and media, eliminating backup traffic from the LAN? → LAN-free backup using a SAN
25. What protocol does NAS primarily use to share files with Windows clients? → SMB/CIFS
26. What is a 'full backup'? → A backup that copies all selected data regardless of when it was last backed up
27. What is 'latency' in the context of storage systems? → The time delay between a request and the fulfillment of that request
28. What is 'ISL' (Inter-Switch Link) in a Fibre Channel SAN fabric? → A direct physical connection between two FC switches used to extend the fabric
29. What does Recovery Point Objective (RPO) measure in the context of replication? → The maximum acceptable amount of data loss measured in time
30. Which component in a Fibre Channel SAN provides name services, login, and routing for connected devices? → The FC switch acting as a fabric switch with Fabric Login (FLOGI) services