longest i have seen in a store was 100ft but if you need longer get a roll of Ethernet cable and 3 ends for it then make your own length of cable.
100 meters or 328 feet
100Base-T network require usually cat5 maximum of cable length 100 meters to 380meters.
exceeding the maximum network length network + guide to networks Chapter 5 Review Question 6
10BASE2, or IEEE 802.3, is an early Ethernet Standard that makes use of industry-standard RG-58 coaxial communications cables connected to BNC T-connectors. 10BASE2 gets its identifier, assigned by the Institute of Electrical and Electronics engineers (IEEE), from the following characteristics: "10" means it has a maximum transmission speed of 10Mbps; "BASE" is shorthand for "Baseband Transmission" or "Baseband Ethernet," meaning that the medium only transmits Ethernet signals; and "2" refers to its maximum network segment length of 185 meters, rounded up to 200 meters.
six months
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100 meters or 328 feet unless a repeater (such as a switch or a router) is placed inline.
maximum is 100 meters or 328 ft
Repeaters are usually used in coaxial based ethernet networks. For this purpose they are used to extend the length of a network segment. For example, in a 10base2 ethernet network the maximum length of a segment is 180 meters. A repeater could join two segments together to increase the length of the network and the number of clients in the network. In today's modern networks you will see neither coaxial networks nor repeaters in a LAN. Repeaters are used for DSL transmissions, but not for LANS.
100BASE-T has a data trasnfer rate up to 100 Mbps. 100BASE-T is based on the older Ethernet standard. Its 10 times faster than Ethernet it is also called Fast Ethernet. The 100BASE-T standard is IEEE 802.3u
100 mbps
100Base-T network require usually cat5 maximum of cable length 100 meters to 380meters.
1000 base‑lx
The maximum length of a 10Base2 thinwire ethernet cable is 185 ft.
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The overall network length exceeds IEEE 802.3 standards for that network type.A server on the network contains a faulty NIC.
Exceeding the maximum network length
Depends what you mean by a serial cable - Fibre, Ethernet, RS232, RS485, RS422, USB, HDMI, SMPTE292 are all examples of serial communications media. RS232 max length 50 ft Ethernet max length 100 m