شبکه کامپیوتری(قسمت3)

[AliReza]

به صورت پیش فرض به یک ویندوزserver،همزمان2نفربیشتر نمیتوانند وصل شوند! (ولی بابرنامه ای قابل گسترش هست!)
نکته:برای فهمیدن اینکه درحالت عادی بهserver همزمان چندنفرمیتوانندوصل شوند:

1. start
2. All programs
3. Administrative tools
4. Terminal services configuration
5. پنجرهNetwork adapter

درادامه کافیست روکامپیوترها برنامه Remote desktop رانصب کنیم،خب یعنی چی؟یعنی وقتی Windows کامپیوترها اومدبالا باRD(مخفف اسم برنامه) وصل شین بهserver که برنامه موردنظردر Databaseاش نصب است.پردازش اصلی درserver انجام میشه ولی اونافقط میبینند.
درموردXp:
به طورپیش فرض فقط1نفرمیتونه بهش وصل شه! !(ولی بابرنامه ای قابل گسترش هست!)
یعنی شمابه این وصل شویدنفرپشت سری رامیندازه بیرون.
درسنامه:
(راستش توضیحات فارسی بدرد بخورنبود ،دوستان هرجا سوال بود بفرمایید!)

Unicast

Unicast is a type of transmission in which information is sent from only one sender to only one receiver. In another words, Unicast transmission is between one-to-one nodes (involving two nodes only).
Examples of Unicast transmission are http, smtp, telnet, ssh, pop3 where the request for information is directed from one sender to only one receiver at the other end.
To understand this better, try to imagine a scenario where one computer’s request for the URL [http://www.google.com] is received by every other computer that’s connected to the Internet. This way Internet will be flooded with such requests and therefore there is a strong need for Unicast transmission on small and large networks. All Ethernet and IP networks support this type of transmission.
Unicast uses TCP for its communication and packet transmission.
For further info, refer to – IETF RFC
Broadcast

Broadcast is a type of transmission in which information is sent from just one computer but is received by all the computers connected to the network. This would mean that every time a computer or a node would transmit a packet of type ‘broadcast’, all the other computers will receive that information packet.
Examples of broadcast are many but one that would be best to understand here is a computer booting up and requesting for a IP address. In this case, the computer which is booting up and requesting for an IP address does not know which computer will be able to provide it with an IP address. It will then broadcast a request packet on the network which will be received by all the other computers but will be acknowledged by only the computer acting as a DHCP server. One other example would be that of the ARP (Address Resolution Protocol) which will broadcast the address resolution request to all other computers on the network.
Broadcast uses TCP for its communication and packet transmission.
For further info, refer to – IETF RFC
Multicast

Multicast is a very much different from Unicast and Multicast in definition and application as well. It is a type of transmission or communication in which there may be more than one senders and the information sent is meant for a set of receivers. Please note that sometimes information might not be directed towards any receiver at all.
One good example of Multicast based network is video transmission network in which one computer needs to transmit video channel to a specific group of computers. This way when the other computers are also a part of this Multicast IP network, they will be able to receive same set of data at the same time. Multicast offers savings on bandwidth and is the preferred way of data communication when data is to transmitted to a set of computers

موضوعات مشابه:

• شبکه کامپیوتری(قسمت5)
• ترفند ها و نکات جالب کامپیوتری
• کلاس شبکه های کامپیوتری1/مهندس حدیقی
• شبکه های کامپیوتری 1 / قسمت دوم pdf
• اخطارهای خنده دار کامپیوتری