SEMINARLab

Ultimate way of free seminar, assignment, question&answer, theses, news, downloads....

1. What is 6Bone and IPv6 ?
The 6Bone is an experimental test bed for IP version 6 that exists to help vendors and users participate in the actual evolution and transition to IPv6.

2. What is Abilene ?
In early 1999, Abilene, the newest addition to the Internet backbone, was brought online. Abilene was developed by University Corporation for Advanced Internet Development (UCAID), a consortium of 132 diversities. The new backbone will eventually connect over 100 universities using the Qwest nationwide fiber-optic network and is the first part of UCAID's Internet2 project.

3. Define ABONE (Active Backbone)?
ABONE is an experimental network that is being used to explore and test the concept of Active Networks, a new technology that adds intelligence to data packets so they can direct themselves through networks, rather than rely on routers. This is not to be confused with the Asia-wide Internet backbone that connects a number of Asian countries, including Japan and Thailand.

4. What are the primary access methods?
The primary access methods listed below:
a. CSMA/CD (Carrier Sense Multiple Access/Collision Detection)
b. CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance)
c. Token Passing

5. What is Discretionary Access Controls?
Discretionary access control, or DAC, is a form of access control that allows more granular control over access to resources (directories and files). One user can be granted read access, while another can be granted read/write access. This is possible because each user has an individual user account that can be assigned different access controls. In some systems, a user can grant another user access to resources that they own..

6. Brief explanation - CSMA/CD (Carrier Sense Multiple Access/Collision Detection)?
Carrier sensing implies that network nodes listen for a carrier tone on the cable and send information when other devices are not transmitting. Multiple access means that many devices share the same cable. If two or more devices sense that the network is idle, they will attempt to access it simultaneously (contention), causing collisions. Each station must then back off and wait a certain amount of time before attempting to retransmit. Contention may be reduced by dividing networks with bridges or using switches.

7. What is CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance)?
This access method is a variation on the CSMA/CD method. Nodes estimate when a collision might occur and avoid transmission during that period. This method is cheaper to implement, since collision detection circuitry is not required; however, it imposes more delay and can slow network throughput.

8. Explain Token Passing?
ARCNET and token ring networks use the token-passing access method. A workstation must have possession of a token before it can begin transmission. The token is passed around the network. Any station that needs to transmit must grab the token.

9. What is ACID?
The four states defined by the acronym ACID (atomicity, consistency, isolation, and durability) relate to a successful transaction, usually a database transaction. All of these characteristics must be present, or the transaction must be completely reversed.

10. What is Acknowledgments?
An acknowledgment is a confirmation of receipt. When data is transmitted between two Systems, the recipient can acknowledge that it received the data. Acknowledgments compensate for unreliable networks.

11. What is Acrobat?
Acrobat is a product from Adobe Systems Incorporated that strives to be a universal document formatter and viewer. You can create document layouts and formats using any variety of typefaces, font sizes, layouts, and graphical information and then save those documents in Adobe Portable Document Format (PDF), which can be read by an Acrobat reader.

12. What is Microsoft's Active Directory?
Microsoft's Active Directory is the directory service included with Windows 2000 Server. Windows 2000 is the successor to Windows NT Server 4.0. Active Directory extends the feature set found in Windows NT domain services and adds new features. It is a secure directory database that can be partitioned and distributed via replication throughout the network. Active Directory is also scalable, and is designed to work in an environment with thousands of servers and millions of objects.

13. What is Active Networks?
Active Networks (or Active Nets) is a DARPA (Defense Advanced Research Projects Agency) program to develop a next-generation Internet with a more dynamic routing model. The Active Network concept is to move from static routers to active nodes that can handle "smart packets" (also called capsules) that have their own executable code. Active Networks represent a new approach to network architecture that incorporates interposed computation.

14. What is ActiveX?
ActiveX is Microsoft's component technology based on Microsoft's COM (Component Object Model), which itself is based on OLE (Object Linking and Embedding). OLE provides a linking technology in which an object inserted into documents (such as a pie chart created in Excel) is automatically updated when the parent object (in the Excel spreadsheet) is updated.

15. What is COM?
COM is a development technology that advances OLE. It allows multiple objects and programs on the same computer to communicate, which promotes component application development. COM also promotes component reuse, meaning that components can be designed to work with multiple programs. DCOM (Distributed COM) extends COM onto networks, allowing two components on different computers to communicate and work together.