C:\UMBC\331\java> java.ext.dirs=C:\JDK1.2\JRE\lib\ext java.io.tmpdir=C:\WINDOWS\TEMP\ os.name=Windows 95 java.vendor=Sun Microsystems Inc. java.awt.printerjob=sun.awt.windows.WPrinterJob java.library.path=C:\JDK1.2\BIN;.;C:\WINDOWS\SYSTEM;C:\... java.vm.specification.vendor=Sun Microsystems Inc. sun.io.unicode.encoding=UnicodeLittle file.encoding=Cp1252 java.specification.vendor=Sun Microsystems Inc. user.language=en user.name=nicholas java.vendor.url.bug=http://java.sun.com/cgi-bin/bugreport... java.vm.name=Classic VM java.class.version=46.0 java.vm.specification.name=Java Virtual Machine Specification sun.boot.library.path=C:\JDK1.2\JRE\bin os.version=4.10 java.vm.version=1.2 java.vm.info=build JDK-1.2-V, native threads, symcjit java.compiler=symcjit path.separator=; file.separator=\ user.dir=C:\UMBC\331\java sun.boot.class.path=C:\JDK1.2\JRE\lib\rt.jar;C:\JDK1.2\JR... user.name=nicholas user.home=C:\WINDOWS C:\UMBC\331\java>java envSnoop -- listing properties -java.specification.name=Java Platform API Specification awt.toolkit=sun.awt.windows.WToolkit java.version=1.2 java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment user.timezone=America/New_York java.specification.version=1.2 java.vm.vendor=Sun Microsystems Inc. user.home=C:\WINDOWS java.vm.specification.version=1.0 os.arch=x86 java.awt.fonts= java.vendor.url=http://java.sun.com/ user.region=US file.encoding.pkg=sun.io java.home=C:\JDK1.2\JRE java.class.path=C:\Program Files\PhotoDeluxe 2.0\Adob... line.separator=
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Ports and Connectors  What are USB ports? USB (universal serial bus) port can connect up to 127 different peripherals together with a single connector type PCs PCs typically typically have have six six to to eight USB USB ports on front front or or back back of of the the system system unit unit USB 2.0 p. 208 Single Single USB USB port port can can be be used used to attach multiple peripherals in in a daisy daisy chain chain First First USB USB device device connects connects to to USB USB port port on on computer computer Third Third USB USB device device connects connects to to second second USB USB device, device, and and so so on on Second Second USB USB device device connects connects to to first first USB USB device device Next
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Chapter 2: Operating-System Structures  Operating System Services  User Operating System Interface  System Calls  Types of System Calls  System Programs  Operating System Design and Implementation  Operating System Structure  Virtual Machines  Operating System Debugging  Operating System Generation  System Boot Operating System Concepts – 8th Edition 2.2 Silberschatz, Galvin and Gagne ©2009
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Chapter 2: Operating-System Structures  Operating System Services  User Operating System Interface  System Calls  Types of System Calls  System Programs  Operating System Design and Implementation  Operating System Structure  Virtual Machines  Operating System Debugging  Operating System Generation  System Boot Operating System Concepts – 8th Edition 2.2 Silberschatz, Galvin and Gagne ©2009
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S1(config)# int fa0/1 S1(config-if)# udld ? port Enable UDLD protocol on this interface UDLD must be enabled on interconnecting interfaces. S1(config-if)# udld port ? aggressive Enable UDLD protocol in aggressive mode on this interface S1(config-if)# udld port aggressive S1(config-if)# end S1# *Mar 1 01:50:32.670: %SYS-5-CONFIG_I: Configured from console by console S1# S1# show udld neighbors Port Device Name Device ID Port ID Neighbor State ----------------------------------------S1# UDLD is now enable on S2 S1# show udld neighbors Port Device Name Device ID Port ID Neighbor State ----------------------------------------Fa0/1 FCQ1628Y5LK 1 Fa0/1 Unknown S1# S1# show udld neighbors Port Device Name Device ID Port ID Neighbor State ----------------------------------------Fa0/1 FCQ1628Y5LK 1 Fa0/1 Bidirectional S1# The port eventually transitions to a bidirectional state
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Chapter 2: Operating-System Structures  Operating System Services  User Operating System Interface  System Calls  Types of System Calls  System Programs  Operating System Design and Implementation  Operating System Structure  Virtual Machines  Operating System Debugging  Operating System Generation  System Boot Operating System Concepts Essentials – 8th Edition 2.2 Silberschatz, Galvin and Gagne ©2011
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