The following frame should be transmitted over a given network (the frame is shown in hexadecimal): 7E DB DD 7E C0 7D DB DC FF C0.a) If the SLIP framing protocol is used; what are the bytes that are sent on the wire (after framing)? Show your work

A straightforward framing system called SLIP (Serial Line Internet Protocol) is employed to deliver…

Answered: The following frame should be…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

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The following frame should be transmitted over a given network (the frame is shown in hexadecimal):

7E DB DD 7E C0 7D DB DC FF C0.

a) If the SLIP framing protocol is used; what are the bytes that are sent on the wire (after framing)? Show your work

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The SLIP frame begins with the character 0xC0, known as the SLIP END character. Bytes in the frame are treated as either control characters or non-control characters. Non-control characters are sent as is, while control characters are replaced by a two-byte sequence. Specifically, 0x7E and 0xDD are non-control characters and are sent as is. 0xDB, 0xC0, and 0x7D are control characters and are replaced by the two-byte sequences 0xDB 0xDC, 0xDB 0xDC, and 0xDB 0xDD, respectively. The byte 0xDC is also a control character and is replaced by the two-byte sequence 0xDB 0xDD. Finally, the frame ends with the SLIP END character (0xC0).

The bytes sent on the wire (after framing) are 0xC0 7E DB DD 7E C0 7D DB DC FF DB DD 0xC0.

The frame begins with a flag sequence represented by the bit sequence 01111110 and denoted by the value 0x7E. Each byte in the frame undergoes encoding using the HDLC bit-stuffing algorithm, which inserts an additional 0 bits after every sequence of five consecutive 1 bits. In cases where the byte is a control character, such as 0xDB, 0xC0, and 0x7D, it is XORed with 0x20 before bit stuffing, flipping bit 5. Finally, the frame ends with the flag sequence (0x7E) represented by the bit sequence 01111110.

The bits sent on the wire after framing the given frame in hexadecimal are 01111110 11011011 11011101 01111110 11000000 01111101 11011011 11011100 11111111 11000000 01111110.

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