Example of questions for KTH “Introduktion till Stordatorer” course Please fill the correct alternatives. Please note that there could be more than statement that is valid. Good luck 1. A CPC (Central Processing Complex) contains a. Processor Storage b. Channels c. Disk to hold customer data 2. The hardware I/O configuration is defined by using a. ICKDSF utility program b. HCD ISPF dialog c. SMP (System Modification Program) 3. Before a dataset can be processed the, a. Dataset must opened b. Dataset must be allocated c. The file descriptor must be retrieved 4. There is a number of access methods available, both VSAM and non VSAM. What defines which access method to use in a user program. a. Information in the DCB b. Information on JCL c. Information in SYS1.PARMLIB 5. What happens if the I/O device is busy when the program likes to perform an I/O operation. a. The program receives a return code that indicates that the I/O operation must be retried. b. The I/O operation is queued by IOS c. The I/O operation is lost 6. How does I/O understand that an I/O operation has completed a. An external interrupt is presented b. A program interrupt is presented c. An I/O interrupt is presented 7. What happens if z/OS is disabled for interrupts at the time when the above interrupt should be presented. a. Interrupt is lost and the missing interrupt handler resolves the problem b. The interrupt is stacked and presented when the z/OS opens up for interrupts c. I/O operation has to be retried 8. I/O processing is carried out by dedicated processors. What is the name of this function. a. CSS, Channel Sub System b. zAAP, zSeries Application Assist Processor c. EXCP Driver 9. The default size of an address space is
a. b. c.
16MB 2GB 16EB
10. What is the size of the virtual storage area that can be used by a normal program a. Up to value specified in JCL parameter REGION. b. If REGION=0 specified there is no limit (ie 16EB) c. An old program, (AMODE 24) can only use Private Region below 16MB line 11. What are the two types of dispathable units? a. AS and TCB b. TCB and SRB c. AS and DCB 12. What is common for elements on the True Ready Queue? a. This is where the Dispatcher goes looking for things to do. b. There is one element on this queue for each address space that is swapped in c. Elements are queued in dispatching order 13. What are the different types of interrupts a. SVC b. DIVIDE c. Cannel Sub System Check e. RESTART f. I/O g. Program h. Supervisor Call i. Machine Check 14. What are the ways to get in to z/OS a. telnet b. rlogin c. TSO login 15. z/OS is a UNIX operating system a. YES b. NO 16. What is JES2 doing? a. Handles SPOOL b. Handles Batch Jobs c. Performs device allocation for batch jobs d. Is responsible for address space creation 17. What is done in the JES2 Conversion phase a. Job number is assigned to job b. Spool data is printed c. Procedure are expanded d. JCL is stored on SPOOL in internal text format
18. A number of JES2 systems can share one set of SPOOL volumes a. True b. False 19. The number of levels of catalogs a. Is maximized to 2 b. Has no limit c. Is defined by the Alias Levels parameter 20. How do run a program in an other address space a. Use the brach instruction b. Use the PC c. Build an SRB and puts in on a queue with a SCHEDULE 21. In which catalog is your data catalogued? a. The master catalog b. In the catalog defined by SYS1.PARMLIB c. In the catalog with the name equal to your userid. 22. When submit a batch job the program in the EXEC statement has to be a. In a LINKLIST dataset b. In the dataset indicated by the SYSLMOD DD statement c. In the dataset indicated by the STEPLIB DD statement 23. A Volume Table of Contents (VTOC) is used to a. Find volume on which a dataset is placed b. Describe free space on volume c. Find datasets on volume. 24. What is/are the similarity between PDS and PDSE a. Both have to be compressed b. Both have a fixed maximum number of members to hold c. Both have a directory and members d. Both can be allocated with ISPF and JCL 25. The channel subsystem executes the I/O operation by use of a. A channel program b. Information in the Hardware Storage Area (HAS) c. Each byte read or written is moved by the Input Output Supervisor (IOS) .