It might be padded on transmission; if the information for a particular protocol can be padded, that protocol must allow information to be distinguished from padding.
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PPP was designed to work with numerous network layer protocols, including Internet Protocol (IP), TRILL, Novells Internetwork Packet Exchange (IPX), NBF, DECnet and AppleTalk. Automatic Cable Manager 12 Activator Rarest Full Internet ConnectionLike SLIP, this is a full Internet connection over telephone lines via modem. ![]() It resends any damaged packets. The designers of PPP included many additional features that had been seen only in proprietary data-link protocols up to that time. ![]() There is one NCP for each higher-layer protocol supported by PPP. It is an integral part of PPP, and is defined in the same standard specification. LCP provides automatic configuration of the interfaces at each end (such as setting datagram size, escaped characters, and magic numbers) and for selecting optional authentication. The LCP protocol runs on top of PPP (with PPP protocol number 0xC021) and therefore a basic PPP connection has to be established before LCP is able to configure it. Although deprecated, Password Authentication Protocol (PAP) is still sometimes used. Most commonly, the Internet Protocol Control Protocol (IPCP) is used, although Internetwork Packet Exchange Control Protocol (IPXCP) and AppleTalk Control Protocol (ATCP) were once popular. For every network layer protocol used, a separate Network Control Protocol (NCP) is provided in order to encapsulate and negotiate options for the multiple network layer protocols. It negotiates network-layer information, e.g. NCPs include fields containing standardized codes to indicate the network layer protocol type that the PPP connection encapsulates. When the node sends PPP LCP messages, these messages may include a magic number. If a line is looped, the node receives an LCP message with its own magic number, instead of getting a message with the peers magic number. Two authentication choices are Password Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol (CHAP). Automatic Cable Manager 12 Activator Rarest Free Data LinkThe Quality and Magic Number options help ensure a reliable, loop-free data link. The Magic Number field helps in detecting links that are in a looped-back condition. Until the Magic-Number Configuration Option has been successfully negotiated, the Magic-Number must be transmitted as zero. Magic numbers are generated randomly at each end of the connection. Likewise if both peers agree to Protocol field compression, then the 0x00 byte can be omitted.
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