Which of the following allows client access to mainframe (IBM)?

A.
An FTP server

B.
A NAS server

C.
An SNA server

D.
A SAN server

Explanation:
A Systems Network Architecture (SNA) server allows client access to mainframe (IBM) and mid-range data facilities.
Incorrect Answers:
A: A, File Transfer Protocol (FTP) server transfers files across the Internet, an extranet, or an intranet.
B: A Network-Attached Storage (NAS) server provides file storage directly on the transport network.
D: A Storage Area Network (SAN) is a network designed to attach such computer storage devices as disk array controllers and tape libraries to servers. SAN servers access their data using low-level block storage methods, as opposed to the file storage access method, References: Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 18-25.