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interface card (NIC) or adapter that connects a computer to the network This means that every network adapter comes with a unique address, and the end user does not have to worry about it If a message is to be broadcast to all stations on a network, the destination address must contain all 1 s Length The number of bytes in the data field In earlier Ethernet standards, this was a type code, which was greater than 1,500 to avoid getting in the way of the length, which is 0 to 1,500 Data The data being transmitted, which can be from 0 to 1,500 bytes long Padding Required if the data is less than 46 bytes, so if the data field contained 38 bytes, 8 bytes of padding would be included CRC (cyclical redundancy check) Also called a Frame Check Sequence (FCS), it is a 32-bit (4-byte) number derived from all the bits in the transmission by using a complex formula The sending computer calculates this number and stores it in the frame sent to the other computer The receiving computer also calculates the number and compares it with the number in the frame If the numbers are the same, it is assumed that the transmission was received without error If the numbers are different, the transmission will be repeated
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The principal difference between the original DIX Ethernet standard (called Ethernet II Ethernet I was the original specification prior to DIX) and Ethernet 8023 is that Ethernet II has a type code in place of the length in the frame The type code is used to adapt Ethernet to different computer environments, which is done outside of the frame in 8023 In the Internet protocol TCP/IP (see Networking Protocols later in this chapter), the Ethernet frame is used with a type code that identifies the Internet protocol Ethernet Hardware Ethernet LAN technology defines eight alternative hardware standards that can be used with Ethernet; a ninth is under development Each hardware standard uses a specific type of cable and cable layout, or topology, and provides a rated speed on the network in Mbps, a maximum segment length, and a maximum number of computers on a single segment The hardware standards are as follows: NOTE In the IEEE names for the Ethernet hardware standards, such as 10Base5, the 10 is the speed in Mbps; the Base is for baseband, a type of transmission; and the 5 is the maximum segment length in hundreds of meters In more recent standards, such as 10BaseT, the T stands for the type of cabling (twisted-pair in this case) 10Base5 (also called Thicknet) The original hardware specification in the DIX standard It uses a thick coaxial cable in a bus topology with a fairly complex connection at each computer to produce a 10-Mbps speed over a 500-meter (1,640-foot) maximum segment with up to 100 computers per segment and three segments 10Base5 is expensive and cumbersome to use, and is seldom used today 10Base2 (also called Thinnet or Cheapernet) Uses RG-58 A/U thin coaxial cable in a bus topology with a simple BNC barrel type of connector to produce a 10-Mbps speed over a 185-meter (606-foot) maximum segment with up to 30 computers per
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segment and three segments Until the 1990s, Thinnet was the least expensive form of Ethernet networking for small (30 or fewer nodes) organizations 10BaseT (also called Twisted-Pair) Uses unshielded twisted-pair (UTP) telephone-like cable in a star topology (see Figure 5-2) with a very simple RJ-45 telephone-like connector to produce a 10-Mbps speed over a 100-meter (328-foot) segment with one computer per segment and 1,024 segments In the 1990s, 10BaseT came down in price to that of 10Base2, and with its exceptional expandability, it became very attractive for most organizations 10BaseF Uses fiber-optic cable in a star topology running at 10 Mbps to connect two networks up to 4,000 meters (13,120 feet, or about 25 miles) apart This was often used to connect two or more buildings on a campus 100BaseT (also called Fast Ethernet) Has the same specifications as 10BaseT except that the cabling requirements are a little more demanding (requires Category 5 cable in place of Category 3) and it goes ten times as fast 100BaseT is now cheaper than 10BaseT, and with its significant added speed, it has become the Ethernet hardware standard of choice With the appropriate connecting hardware (see Networking Hardware later in the chapter), you can mix 10BaseT and 100BaseT hardware in the same network to slowly upgrade a 10BaseT network There are two subspecifications to 100BaseT: 100BaseTX, the most common, which runs over Category 5 UTP using two twisted pairs, and 100BaseT4, which runs over Category 3 UTP using four twisted pairs 100BaseFX Uses fiber-optic cable running at 100 Mbps to connect two networks up to 412 meters (1,351 feet) apart or, if full-duplex (separate fibers for sending and receiving) is used, up to 2 kilometers (over 6,500 feet, or a mile and a quarter) Like 10BaseF, 100BaseFX is primarily used to join two networks 1000BaseT and F (also called Gigabit Ethernet) Uses standard Category 5 or fiber-optic cable to run at 1,000 Mbps Distance standards range from 25 meters (82 feet) to 100 meters (328 feet) for copper UTP, and 550 meters (1,800 feet) for fiber In mid-2007, Gigabit Ethernet equipment was on the market for only slightly more than Fast Ethernet, with ten times the speed Its price has dropped significantly in the five years it has been on the market 10GBaseT and various fiber configurations (also called 10 Gigabit Ethernet or 10GbE) Uses Category 6 copper and several fiber-optic cable schemes to run at 10,000 Mbps The standard distance for copper is 100 meters (328 feet) A number of 10GBase fiber standards use different types of fiber-optic cable with distances ranging from 28 meters (92 feet) to 40 kilometers (25 miles) In mid-2007, 10GBase equipment was difficult to obtain and quite expensive, but following the patterns of 100Base and 1000Base Ethernet, it will drop significantly 100GBase (also called 100 Gigabit Ethernet or 100GbE) is in the early stages of development with the objective of a fiber-optic network link running at 100,000 Mbps, which approaches internal computer speeds The final standard may not be available until 2010 or later and may be slower than 100,000 Mbps
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