11. The user speaks and a microphone built into the LINK control console picks up the voice. 12. Optional headers may contain further link control information. 13. Link control characters start with odd parity, followed by a one bit, followed by two bits.14. Link Control Protocol ( LCP ) initiates and terminates connections gracefully, allowing hosts to negotiate connection options.15. It provides multiplexing, data fragmentation, error checking, link control , prioritization, and layer 2 addressing services for user data. 16. This de facto standard has been adopted by ISO as High-Level Data Link Control ( HDLC ) in 1979 17. However, IP can run over a reliable data link protocol such as the High-Level Data Link Control ( HDLC ). 18. Service access points are also used in IEEE 802.2 Logical Link Control in Ethernet and similar Data Link Layer protocols. 19. The MAC sublayer acts as an interface between the logical link control ( LLC ) sublayer and the network's physical layer. 20. Sixteen are used to send four ( 4 ) bits, two are unused, and two are used to construct link control characters.
