Exam (elaborations)
HOW z/OS PREPOSSESSES I/O QUESTIONS AND ANSWERS
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HOW z/OS PREPOSSESSES I/O QUESTIONS AND ANSWERS...
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HOW z/OS PREPOSSESSES I/O QUESTIONSAND ANSWERS
- ANSWER The OSA is a hardware card that connects directly to the
mainframe.
In the past it has supported different network connections, today it only
supports Ethernet.
In the past, the OSA used the normal channel subsystem, today it does
not.
Two z/OS systems in the same CEC need a connection for TCP/IP
communications. Which four of these options are valid solutions? -
ANSWER TCP/IP communications CANNOT be performed using direct
CCW channel connections.
The channel subsystem performs some of the I/O processing for
mainframes. Which four of these statements about the channel
subsystem are true? - ANSWER The channel subsystem is used by all
IBM Z mainframe operating systems, including z/OS and Linux on IBM
Z. The channel subsystem performs some of the I/O processing, other
processing is performed by the I/O controllers or control units.
Which three items are channel communication technologies? -
ANSWER Parallel, FICON, ESCON
Channels are used to communicate between IBM Z mainframes and
external subsystems like disk or tape subsystems. Which four of these
statements about channels are true? - ANSWER CCW channels are
used to connect to external subsystems like disk or tape subsystems.
Coupling channels, which are different from CCW channels, are used to
connect operating systems to other operating systems, for example two
z/OS systems, or a coupling facility. They can be external - operate over
an external cable, or internal - if performing connections within the same
CEC.
The Open Systems Adapter (OSA) is a technology that is different from
the traditional channel subsystem. Which three of these could be
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