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| Another side of MCSE Windows 2000 Network Infraustructure Exam- 70-216 |
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| The page covers the details for the 70-216 exam by the following 4 ways: · Standards and Terminology · Planning · Implementation · Troubleshooting First thing that you learn is the OSI model for me it is wasn’t that interesting but this is what I have learned. Although it is not interesting it must be memorized for later troubleshooting a network. It is sort of like a blueprint of a network structure. Physical Layer This is responsible for sending bits from one computer to another. For example you want to get from point A to point B this is what the Physical Layer does it physically sends it. The Data Link Layer This provides for the flow of data over a single physical link from one device to another. This allows for error-free transfer of frames from one computer to another. The Network Layer This provides and handles the moving of packets between devices that are more than one link away from each other. This allows it possible for the transport layer to send packets without being concerned with physical aspects. The Transport Layer This guarantees the deliver of packets error free in sequence with no losses or duplication. The Session Layer This allows applications on two different computers to share a connection which is of course a session. This arranges the meeting between two computers so that it can send information back and forth. The Presentation Layer This translates data between the formats the network requires. This allows applications to establish communication sessions with each other. The Application Layer This is of course the top of the OSI model and it provides the service that support user applications like a database or e-mail and file transfer sharing. Now to me when you read this you probably don’t get much out of it and it is a theory made in 1977 and is worldly accepted model for the understanding of network communication. So that’s that. This leads to the different services that Windows 2000 offers to deliver client information communication. DHCP This something like leasing a car, you negotiate an acceptable term with a car dealer you sign a lease or a document. This lets you have that car for the agreement time and when the lease is over of course you have to give it back. This is the same thing as a DHCP service, which leases IP addresses. It puts a range of IP addresses in its pool and when a client request one it checks in its pool and if it has an available address it will give it out for the amount of time that the Administrator has given. Here are the advantages with DHCP. · Comes with Windows 2000 so it doesn’t cost extra · Once you have it running its all dynamic which means automatic so it creates less TOC (Total Cost of Ownership) · Configuration is minimized · IP addresses are used over and over again so you don’t have to buy new ones · Configuring is easy so you don’t have to use Static configuration which causes confusion and less error made by the Administrator. There are four steps for a client to receive an IP Address from a DHCP Server 1. IP Discovery 2. IP Lease Offer 3. IP Lease Selection 4. IP Lease Acknowledgement DNS DNS or Domain Name System is service that allows users of the network to use human recognize names which means whatever you and me can understand instead of IP address so it is like a Translator. Now to relate at the OSI model this DNS works at the Application layer. An easy way to remember is if you think of it like a telephone book. When you want to call someone you look them up in the book of course and for their name which is of course human readable. But numbers are not they mean nothing to us. WINS WINS by my opinion and by many others is that it is gone about the way side because of what Microsoft is trying to push out. They want more of DNS and TCP/IP interacting with Active Directory. WINS basically converts Net BIOS names that is used by Windows x. Operating systems to TCP/IP or vice versa. |
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