PPP: Point To Point Protocol In Hindi, PPP हिंदी में/ What are the key features of the Point to Point Protocol PPP?

PPP को हम पॉइंट टू पॉइंट प्रोटोकॉल(point to point protocol in Hindi) के नाम से भी जानते है | PPP (point to point protocol) प्रोटोकॉल एरर डिटेक्शन(error detection) को हैंडल करता है, बहुत सरे प्रोटोकॉल को सपोर्ट करता है, कनेक्शन के टाइम पर IP addresses को निगोशिएट करने के लिए allow करता है , ऑथेंटिकेशन(authentication) के लिए परमिशन देता है , और इसके बहुत सरे सुधार जो कि यह SLIP के ऊपर करता है |

आज बहुत सरे इंटरनेट प्रोवाइडर दोनों SIIP and PPP (Point To Point Protocol In Hindi) प्रोटोकॉल का यूज कर रहे है , पर फ्यूचर टाइम में PPP का ही महत्व रहेगा जो कि सिर्फ डायल उप लाइन के साथ ही नहीं बल्कि लीज्ड राऊटर-राऊटर लाइन्स के लिए भी रहेगा.

PPP(Point To Point Protocol In Hindi) से हमें प्रमुख तौर पर तीन चीज़े मिलती है, जो कि निम्नलिखित है|

PPP (Point To Point Protocol In Hindi) एक ऐसा फ्रेमिंग मेथड देता है जिससे हम किसी फ्रेम के एन्ड और अगले फ्रेम का स्टार्टिंग कि स्पष्ट रूपरेखा बना सके| फ्रेम फॉर्मेट एरर डिटेक्शन को भी हैंडल करता है |

PPP (Point To Point Protocol In Hindi) एक लिंक कण्ट्रोल प्रोटोकॉल प्रोवाइड करता है, जो लाइन्स को ऊपर लाने, उन्हें टेस्ट करने , निगोशिएट ऑप्शन में मदद करता है | और जब उनकी जरुरत नहीं होती तब उन्हें बहुत अच्छे तरीके से नीचे लाता है | इस प्रोटोकॉल को LCP(लिंक कण्ट्रोल प्रोटोकॉल कहते है )

PPP (Point To Point Protocol In Hindi) एक तरह से नेटवर्क-लेयर विकल्प पर बातचीत करने का एक तरीका है जो उपयोग किए जाने वाले नेटवर्क लेयर प्रोटोकॉल के लिए स्वतंत्र है। जिस विधि को चुना गया है, उसमें समर्थित प्रत्येक नेटवर्क लेयर के लिए एक अलग NCP (नेटवर्क कंट्रोल प्रोटोकॉल) है।

The ppp frame format was chosen to closely resemble the HDLC frame format, since there was no reason to reinvent the wheel. The major difference between PPP and HDLC is that the former is character oriented rather than bit oriented.

In particular, PPP (Point To Point Protocol In Hindi) , like SLIP uses character stuffing on dial-up modem lines. So all frames are an integral number of bytes. it is not possible to send a frame consisting of 30.25 bytes, as it is with HDLC.

Not only can PPP (Point To Point Protocol In Hindi) frames be sent over dial-up telephone lines, but they can also be sent over SONET or true bit-oriented HDLC lines. The PPP frame format is shown in fif1 below

ppp-frame-format
Point To Point Protocol In Hindi:PPP(point to point)-frame-format

All PPP (Point To Point Protocol In Hindi) frames begin with the standard HDLC flag byte(01111110), which is a character stuffed if it occurs within the payload field. Next comes the address field, which is always set to the binary value 11111111 to indicate that all the stations are to accept the frame. Using this value avoids the issue of having to assign a data-link address.

The address field is followed by a control field, the default value of which is 00000011. This value indicates an unnumbered frame. In other words, PPP does not provide reliable transmission using sequence numbers and acknowledgments as the default.

In noisy environments, such as wireless networks, reliable transmission using numbered mode can be used. The exact details are defined in RFC in 1663.

Since the address and control fields are always constant in the default configuration. LCP provides the necessary mechanism for the two parties to negotiate an option to just omit them together and save 2 bytes per frame.

The fourth PPP(Point To Point Protocol In Hindi) field is the protocol field. Its job is to tell what kind of packet is in the payload field. Codes are defined for LCP, NCP, IP, IPX, apple talk, and other protocols.

Protocol starting with a 0 bit are network layer protocol such as IP, IPX, OSI, CLNP, XNS. Those starting with a 1 bit are used to negotiate other protocols. These include LCP and a different NCP for each network layer protocol supported.

The default size of the protocol field is 2 bytes, but it can be negotiated down to 1 byte using LCP.

The payload field is variable length, up to some negotiated maximum. If the length is not negotiated using LCP during line setup, a default length of 1500 bytes is used.

Padding may follow the payload if needed. After the payload, the field comes the checksum field, which is normally 2 bytes, but a 4-byte checksum can be negotiated.

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Anurag

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