Editing Point-to-Point Protocol (section)

==Configuration options==
The previous section introduced the use of LCP options to meet specific WAN connection requirements. PPP may include the following LCP options:
*'''Authentication''' - Peer routers exchange authentication messages. Two authentication choices are [[Password authentication protocol|Password Authentication Protocol]] (PAP) and [[Challenge-Handshake Authentication Protocol|Challenge Handshake Authentication Protocol]] (CHAP). Authentication is explained in the next section.
*'''Compression''' - Increases the effective throughput on PPP connections by reducing the amount of data in the frame that must travel across the link, using a agreed-on algorithm such as BSD [[compress]] or Deflate. The protocol decompresses the frame at its destination. See {{IETF RFC|1962}} for more details.
*'''Error detection''' - Identifies fault conditions. The 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.
*'''Multilink''' - Provides load balancing several interfaces used by PPP through Multilink PPP (see below).