#Ppp frame fields 32 bit#

It uses FCS to detect the errors while transmitting the data. It does not have method to detect the errors. In general PPP provides more features compare to HDLC but HDLC protocol is fast.ДЇollowing table mentions difference between HDLC and PPP protocols.

CHAP provides better authentication as it uses 3-way handshake mechanism.

It is not strong authentication protocol as passwords are sent across in clear text.

PAP uses simple 2 way handshake used at initial link establishment phase.

PAPДЄnd CHAP (Challenge Handshake Authentication Protocol).

PPP supports two authentication protocols viz.

NCP makes sure that IP and other protocols are transmitted across the PPP link. Info field carries upper layer data.Д¬heck field is CRC-16 used for error detection. Protocol indicates upper layer protocol to which frame is delivered viz. PPP Frame consists of start flag, Address, control, protocol, info, check, end flag.

It also suffers from transparency problem as it uses same start and end flags.

It has CRC-16 field in the frame which helps in error control.

It also has built in security mechanism such as PAP and CHAP.

Other than IP, it supports other network layer protocols also. It uses HDLC frame format at layer-2 and uses It uses physical layer clocking and synchronization to send and receive frames. It has flow control mechanism as itДЄdjusts window size based on capability of the receiver. In bit stuffing, 0 is added after every five 1s at the transmit side andД«roadly HDLC is a reliable protocol (uses selective repeat or go-back-N). It may often confuse the receiver and hence to avoid this transparency problem bit stuffing 01111110 to mark start and end of the frame, information frame, supervisory frame or unnumbered frame.ДЄs HDLC uses standard pattern i.e. Control field indicates purpose or function of the HDLC Frame.

#Ppp frame fields 32 bit#

FCS is Frame Check Sequence of 16 bit or 32 bit in size used forД®rror detection. Information contains data to be transmitted. HDLC frame consists of start and end flags with pattern 01111110.

Both side of HDLC modules exchange control information, encoded into a frame.ДЄs shown in figure-2, HDLC Frame contains start flag, address, control, information, FCS, end flag.

On receive side, HDLC accepts data and delivers to high level application layer.

On transmit side, HDLC receives data from application and delivers it to the.

It is also used for synchronous PPP connections. HDLC-High Level Data Link Control Protocol Packet switched networks use X.25, Frame relay and ATM protocols. They use different encapsulation protocols.ДЇor example, leased line (between two routers) and circuit switched network use HDLC, PPP and SLIP protocols. There are different networks exist in WAN. The links between different networks, the data is encapsulated into frames before they

WAN stands for Wide Area Network.ДЄs there is a security concerns when data leaves the company premises and transport across We know that unlike LAN which is used in a single organization, WAN is used to connectДifferent organizations across the cities and countries. This page on HDLC vs PPP describes basic difference between HDLC and PPP protocols. HDLC vs PPP | difference between HDLC and PPP