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  1. Hi Rene,

    A good understanding of ethernet for beginners like me, this helps me so much in my workplace. The explanations with real pictures of device make me clear understanding of concepts
    Thank you

  2. Hi Rene,
    There are 2 types of Ethernet framing: 802.3 and Ethernet II.

    according to cisco “Ethernet II is the Ethernet frame format used in TCP/IP networks.” So what about the 802.3 Frame ? I’m not really able to find any explanation…
    Thank you in advance and regards.


  3. Hello Mohammad

    Yes, there are several types of Ethernet framing, two of which are the most common that you mention above.

    Ethernet II has a two byte EtherType field that identifies the upper layer protocol (e.g. IP) that encapsulates the frame. For example, a value of 0x0800 indicates an IPv4 packet while a value of 0x0806 indicates an ARP frame.

    The IEEE 802.3 standard changes the role of the EtherType field to a “Data Length Field”.

    Later on, because both types were in wide use, IEEE 802.3 incorporated Ethernet II and standardised both formats.

    Today, both o

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  4. Hello Aditya

    Traditionally, routers, switches, and computers require a different type of Ethernet cable to connect to each other. There are crossover cables and straight through cables, as described in the lesson.

    What auto MDIX does is it automatically detects the kind of cable required for a particular connection, and if the cable used is the wrong type, then it automatically switches the appropriate pins internally on the switch or router, such that the correct connectivity is achieved. So for example, if you use a crossover cable to connect a PC to a swit

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  5. Hello Adrian, good to have you with us! Glad to hear that you’re enjoying the lessons!

    In order to understand what is going on, let’s take it step by step. The packet has arrived from the Internet at the SOHO router. Now we don’t know what kind of header we’ll find at layer 2, as this depends on the technology being used. If it’s ADSL, serial link, or cable modem, each of these have a different L2 technology, and therefore a different L2 header. Whatever it is, the L2 header is stripped off, and we are at Layer 3 of the OSI model. So we take a look at the

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