 Wysłany: Nie 9:40, 08 Kwi 2007 Temat postu: |
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| Wysłany: Wto 19:59, 03 Sty 2006 Temat postu: |
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| Ethernet (ang. ether ‘eter’ + net ‘sieć’) infor. lokalna sieć (np. przemysłowa) działająca na zasadzie magistrali, gdzie do jednego kabla przenoszącego dane przyłączona jest większa określona liczba użytkowników.
Ethernet bazuje na idei węzłów podłączonych do wspólnego medium i wysyłających i odbierających za jego pomocą specjalne komunikaty (ramki). Ta metoda komunikacji nosi nazwę CSMA/CD (ang. Carrier Sense Multiple Access with Collision Detection). Wszystkie węzły posiadają unikalny adres MAC. Istnieją 4 standardy ramek: • Ethernet wersja 1 - już nie używana, • Ethernet wersja 2 (Ethernet II) - zwana też ramką DIX od firm DEC, Intel i Xerox, które opracowały wspólnie ten typ ramki i opublikowały w 1978. Jest ona w tej chwili najczęściej stosowana, • IEEE 802.x LLC, • IEEE 802.x LLC/SNAP. Ramki różnią się pomiędzy sobą długościami nagłówków, maksymalną długością ramki (MTU) i innymi szczegółami. Różne typy ramek mogą jednocześnie korzystać z tej samej sieci. Repeater służy do fizycznego zwiększania rozmiarów sieci (wzmacnia i regeneruje sygnały przesyłany kablem). Router to urządzenie sieciowe, które określa następny punkt sieciowy do którego należy skierować pakiet danych (np. datagram IP). Ten proces nazywa się routingiem (rutingiem) bądź trasowaniem. |
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| Wysłany: Pon 13:32, 26 Gru 2005 Temat postu: Pytanie nr.2 oraz 9 ;) |
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| Pytanie nr. 2
Sieci Ethernet Sieć wykorzystuje wspólny nośnik informacji, wszystkie węzły sieci, które mają do wysłania pakiety informacji, konkurują o czas na kablu połączeniowym. Możemy powiedzieć, ze sieć pracuje według zasady Kto pierwszy ten lepszy. Ethernet posiada przepustowość 10 Mbit/s (wyjątek stanowi odmiana Ethernetu: 10Base5 oraz nowsze rozwiązania) i wykorzystuje metodę dostępu CSMA/CD. Do pojedynczej sieci lokalnej można podłączyć do 8000 stacji roboczych. Podstawowe odmiany Ethernetu to: Wersja 10Base-T skonfigurowana jest w topologii gwiazdy, gdzie do każdej stacji biegnie oddzielny przewód od centralnego huba. W przypadkach, kiedy wykorzystywany jest przewód koncentryczny, stacje robocze łączy się w szereg (magistrala). Pytanie nr.3 czym rózni sie router od repeatera Router - to urządzenie sieciowe, które określa następny punkt sieciowy do którego należy skierować pakiet danych (np. datagram IP). Ten proces nazywa się routingiem (rutingiem) bądź trasowaniem. Routing odbywa się w warstwie trzeciej modelu OSI. Router używany jest przede wszystkim do łączenia ze sobą sieci WAN, MAN i LAN Repeater- Nazywany jest również wzmacniakiem. Informacja przesyłana kablem ulega zniekształceniom proporcjonalnie do jego długości. Jednym z urządzeń, które wzmacnia i regeneruje sygnały przesyłane kablem jest repeater. Repeater służy więc do fizycznego zwiększania rozmiarów sieci. Zwykle zawierają one z kilka wzmacniaków. Repeater powtarza (kopiuje) odbierane sygnały i wzmacnia sygnał. Polega to na zwiększeniu poziomu odbieranego przebiegu falowego bez zmiany jego częstotliwości. Jest to najprostsze urządzenie tego typu. Może łączyć tylko sieci a takiej samej architekturze, używające tych samych protokołów i technik transmisyjnych. Potrafi jednak łączyć segmenty sieci o różnych mediach transmisyjnych. |
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