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What type of encoding is used on ethernet cabling and how is electrical noise minimized by a twisted pair cable?

Hubs have been obsolete for many years. Switches are used now and can forward to the appropriate device based on MAC address. These days, Ethernet can support much larger frames. I have a switch that can support 16 KB frames and 9000 byte frames are often used. These would be referred to as jumbo frames. Also, token ring has long been obsolete. The fragment offset is not an incrementing number for each fragment. It is where in the packet that the fragment belongs. So, if the first fragment was 1200 bytes, then the offset of the 2nd will be 1200/8 or 150, not 2. The /8 is because the offset is in 8 byte blocks and so the 150 means 150 8 byte blocks in. Also, fragmentation is being superceded by Path MTU Discovery, where the source is sent an ICMP message stating the packet is too big. PMTUD is often used on IPv4 and mandatory on IPv6.

WiFi is 802.11, not 802.11b. The letter at the end only indicates the version of 802.11. Actually, Ethernet and 802.3 frames are identical, other than the contents of the Ethertype/Length field, where the value determines which type it is. Then the fields change a bit. Also, there were just minor differences to the description of parts of the frame between the original Ethernet and 802.3 frames. 10baseT originated with StarLAN, which was designed to use existing telephone cabling to reduce costs. The coax 50 ohm specification refers to impedance, not resistance. CSMA/CD is only used with half duplex Ethernet, that is coax or hub networks. With switches, full duplex is used which does not need collision detection.

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can say that ONE physical segment is the same as a broadcast domain??

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