... flag whose value is 7E( 011 1 11 10) The flag is used for synchronisation at the bit level between the sender and receiver Address field: This field has the value of FF (11 11 111 1) Control field: This ... damaged in transit and therefore must be rejected 1.1 .2. 2 X .25 X .25 is widely used, as the packet switching protocol provided for use in a WAN It was developed by the ITU-T in 19 76 X .25 is an interface ... are standardised by three architectural structures: Ethernet, token ring and fibre distributed data interface (FDDI) 1.1 .1. 1 Ethernet Ethernet is a LAN standard originally developed by Xerox and...