introduction introduction DNS ../common/cw/assets/lsnMapIntro.swf courseMapBtn Course Map Course Map MainMenuButtonClicked lessonMapBtn Lesson Map Lesson Map CourseMapButtonClicked glossaryBtn Glossary Glossary GlossaryButtonClicked resourcesBtn Resources Resources ResourcesButtonClicked exitBtn Exit Exit ExitButtonClicked replayBtn Replay Replay ReplayButtonClicked pauseBtn Pause Pause audio playback PauseButtonClicked resumeBtn Resume Resume audio playback ResumeButtonClicked previousPgBtn Previous screen PreviousButtonClicked nextPgBtn Next screen NextButtonClicked dnsint_01 1 Welcome to the Maintaining the Domain Name System, or DNS, course. In today's information security environment, the need to effectively administer the Domain Name System, is greater than ever. This course will introduce you to the concepts and tools that are required to keep your DNS implementation working efficiently, and securely. In addition to this course introduction, there are two lessons and a course conclusion. The first lesson, Troubleshooting DNS Failure, explains the more common troubleshooting scenarios, troubleshooting tools, and ways of approaching DNS failure. The second lesson, Maintaining Performance and Security, delves into DNS security vulnerabilities, how TSIG and DNSSEC can be used to provide security, and DNSSEC troubleshooting tools. This lesson also explains near-term changes to DNS within DoD. The course conclusion provides a summary of lesson topics and objectives. Select each highlighted lesson to explore its objectives and topics. Select the flashing forward arrow to continue. dnsint_01_01 In Troubleshooting DNS Failures, you will learn about query tools, packet capture and other tools, the more common types of troubleshooting scenarios, and guidelines for approaching DNS failure. The lesson has five topics and should take approximately 60 minutes to complete. Troubleshooting D N S Failure Popup 1 of 2: Popup Title: Troubleshooting D N S Failure. Bulleted text appears in synch with audio. Image of digital clock appears counting down to zero from one hour. Image of simple D N S hierarchy appears. dnsint_01_02 Maintaining Performance and Security describes security vulnerabilities of DNS and introduces basic concepts about DNS keys. This lesson explains the use of transaction authentication, or TSIG, to secure DNS, and how Domain Name Security Extensions, or DNSSEC, secures the DNS. This lesson also introduces tools used in troubleshooting DNSSEC, and guidelines for securing a zone. Finally, the lesson reviews upcoming changes to DNS within the DoD environment. The lesson has eight topics, and should take approximately 60 minutes to complete. Maintaining Performance and Security Popup 2 of 2: Popup Title: Maintaining Performance and Security. Bulleted text appears in synch with audio. Image of minee D N S hierarchy enclosed in a globe appears with an image of a lightning bolt just outside the globe`s perimeter. Digital clock counts down from one hour to zero. Screen 1 of 2. Topic Title: Course Introduction. Screen Title: Overview of Course Lessons and Objectives. D N S hierarchy diagram appears against a world map background. Title of the course appears Maintaining the Domain Name System course. Text box appears with course lessons course introduction troubleshooting d n s failure, maintaining performance and security, course conclusion. Lessons are highlighted in synch with audio. Instructions appear to select each highlighted lesson to see its objectives and topics. Troubleshooting D N S failure and Maintaining Performance and Security are highlighted. This course is unclassified for official use only. dnsint_02 2 The Maintaining the Domain Name System (DNS) course provides two hours of instruction. If you are new to DNS systems administration, you can take the complete course for a good foundation on the subject. If you are an experienced professional, you can also use it as a refresher on particular topics, as needed. Select Guided Tour for a complete description of the course navigation features. When you are ready to proceed to the first lesson of the course, Troubleshooting DNS Failure, select the forward flashing arrow. dnsint_02_01 Welcome to the Guided Tour. If you would like to see this audio displayed as text on the screen, select Show Text. The lesson begins with the objectives for the lesson and the lesson's topics. From here, select the forward arrow to proceed to the next screen. The top of the screen shows the lesson title, the lesson topic, and the specific topic currently being discussed. You will be able to interact with various objects on the screen. For example, you can select certain objects to open up a window that contains additional information. Be sure to close the window when you are ready to move on. Other objects are rollovers, which means you can place your cursor on them to display additional information. Make sure you access all the available information on each screen. A Certificate of Completion is available at the end of the lesson. Now let's look at the buttons along the bottom of each screen. Selecting Show Text opens a window containing the audio text. You can close the window if you prefer by selecting Hide Text. You can use the Glossary to look up unfamiliar terms and acronyms. Selecting Course Map brings up a menu of the course lessons. Selecting Lesson Map brings up a map of the topics in the lesson. You can select a topic from the lesson map to go there directly. Resources gives you access to pertinent documents, publications, and directives. The Replay button lets you replay the current screen from the beginning. The Pause button allows you to pause and resume the audio and onscreen animation at any time rather than replaying the entire screen. The Exit button ends your session and closes the program. The Back arrow takes you to the previous screen. And the Forward arrow moves you to the next screen. The page number indicator shows you the current screen and the total number of screens in the lesson. We hope you have enjoyed the tour. Select Replay to review the guided tour, or select Exit to close the tour. Guided Tour Popup 1 of 1: Images from screen lessons appear in support of audio. Animation of cursor rolling over text and images appears in support of audio. Animation of cursor moving over buttons show text, course map, lesson map, glossary, resources, exit, replay, and pause play appears in support of audio. Animation of cursor selecting forward and backward arrow buttons appears. Text You have completed the guided tour appears. Close button appears. Screen 2 of 2. Topic Title: Course Introduction. Screen Title: How to Use This Course. Image of person at a computer appears. Bulleted text appears in support of audio. Button labeled Guided Tour appears. Instructions to select Guided Tour to explore course functions appears.