100BaseFX The IEEE standard 802.3 specification for running Fast Ethernet at 100Mbps over fiber-optic cable with maximum 2000 meters segment length in full duplex mode. https://en.wikipedia.org/wiki/Fast_Ethernet
100BaseT The IEEE standard 802.3 specification for running Fast Ethernet at 100Mbps over unshielded twisted-pair cable with maximum 100 meters segment length in full duplex mode. https://en.wikipedia.org/wiki/Fast_Ethernet#Copper
100BaseT4 The IEEE standard 802.3 specification for running Fast Ethernet at 100Mbps over Category 3 and Category 4 cable by utilizing all four pairs of wires with maximum 100 meters segment length in full duplex mode. https://en.wikipedia.org/wiki/Fast_Ethernet#100BASE-T4
100BaseTX The IEEE standard 802.3 specification for running Fast Ethernet at 100Mbps over two-pair Category 5 cable with maximum 100 meters segment length in full duplex mode. https://en.wikipedia.org/wiki/Fast_Ethernet#100BASE-TX
100BaseVG-AnyLAN The IEEE standard 802.12 specification for running Fast Ethernet at 100Mbps over four-pair Category 3 cable ,with maximum 100 meters segment length in full duplex mode, 150 meters over Category 5 cable, and 2000 meters over fiber-optic cable . VG stands for voice grade which means used over voice-grade cable. https://en.wikipedia.org/wiki/100BaseVG
10Base2 The IEEE standard 802.3 specification for running Ethernet at 10Mbps over thin coaxial cable with maximum 185 meters segment length. https://en.wikipedia.org/wiki/10BASE2
10Base5 The IEEE standard 802.3 specification for running Ethernet at 10Mbps over thick coaxial cable with maximum 500 meters segment length. https://en.wikipedia.org/wiki/10BASE5
acknowledge to send a signal from a receiver to show that the transmission has been received correctly, and the receiver is ready for receiving next transmission, or the receiver is in normal operating condition.
acknowledge character An ASCII code or a special code sent from a receiving terminal after receiving an enquiry character to indicate that the receiving terminal is operating normally, or sent by a receiver to indicate that the transmission has been received correctly and is ready for the next transmission. https://en.wikipedia.org/wiki/Acknowledgement_(data_networks)#Acknowledgement_characters
acknowledgement message A message sent from a receiver to indicate that the transmitted message has been received correctly, and the receiver is ready for receiving next transmission, or the receiver is in normal operating condition. https://en.wikipedia.org/wiki/Acknowledgement_(data_networks)#Protocol_usage