Which NAS backup environment uses a NAS head to retrieve data from storage over a SAN and
then sends the data directly to the backup device?

A.
Serverless

B.
NDMP three-way

C.
NDMP two-way

D.
Server-based

Explanation:
NDMP 2-Way

NDMP is an industry-standard TCP/IP-based protocol specifically designed for a backup in a NAS
environment. It communicates with several elements in the backup environment (NAS head,
backup devices, backup server, and so on) for data transfer and enables vendors to use a
common protocol for the backup architecture. Data can be backed up using NDMP regardless of
the operating system or platform. Due to its flexibility, it is no longer necessary to transport data
through the application server, which reduces the load on the application server and improves the
backup speed. NDMP optimizes backup and restore by leveraging the high-speed connection
between the backup devices and the NAS head. In NDMP, backup data is sent directly from the
NAS head to the backup device, whereas metadata is sent to the backup server.
Figure on the slide illustrates backup in the NAS environment using NDMP 2 -way. In this model,
network traffic is minimized by isolating data movement from the NAS head to the locally attached
backup device. Only metadata is transported on the network. The backup device is dedicated to
the NAS device, and hence, this method does not support centralized management of all backup
devices.
EMC E10-001 Student Resource Guide. Module 9: Introduction to Business Continuity