Network Control Protocol is uses to identify the Network layer protocol used in the packet
error control and recovery flow control ppp(point to point protocol transfering from physical layer to network entities
SLIP
Application: FTP, SMTP, HTTP Transport : TCP, UTP Network : IP, routing protocols Link : PPP ethernet Physical : bit
PPPis more secure than SLIP. PPP uses two authetication Protocols : 1. Password Authetication Protocol (PAP) 2. Challenge Handshake Authetication Protocol (CHAP) So if you use SLIP on network that unauthorized user can gain acces to.
The purpose of the FCS field is to transmit the extra checksum characters added to a frame in "xyz" protocol for error detection. The most popular algorithm I've used is the CRC (cyclic redundancy check) employed in things like ethernet or PPP on a routed network. Keep in mind that ethernet defines that the errored frame should be discarded, but ethernet takes no action to cause the frame to be retransmitted. Typically most tech's see it as unnecessary overhead and opt to rely on CSMA\CD or CSMA\CA if the route is not deemed to carry time sensitive data. Hope that clears things up a bit.
Network control protocol
error control and recovery flow control ppp(point to point protocol transfering from physical layer to network entities
It negotiates and sets up control options on the WAN data link.
PPP is point to point protocol. It does single channel network links, usually over a long distance, or a VPN. The program that sets up and manages PPP connections is pppd.
there may be the issue with the layer 2 protocol like hdlc or ppp is not configured or wrongly configured if the interface is serial interface.
Point-to-Point Protocol
LCP sets up the PPP connection and its parameters. NCP handles higher layer protocol configurations.
You need to use a protocol that will translate serial protocol (your modem) to a packet based network. Protocols such as SLIP, PPP, PPTP are used for that purpose.
- When both ends of a serial WAN link are configured to run the PPP encapsulation method they establish a session based on the 3 steps below:Step 1- Link establishment and configuration negotiation- In this phase LCP opens the connection between the two interfaces and negotiates configuration options. this phase is done once the receiving router sends a configuration-acknowledgment frame back to the router who first initiates the connection...Step 2- Link quality determination (optional)- In this phase LCP tests the link between the routers to determine if the quality is sufficient to bring up the network layer protocol.Step3- Network Layer Protocol configuration negotiation- After step 2 ends, the appropriate NCP can separately configure the network layer protocols, and bring the protocol up and down at any given time. If LCP closes the link between the routers it will inform the network layer protocol so that it can take action in regards to the interfaces.- TERMS -PPP = Point-to-Point ProtocolLCP = Link Control ProtocolNCP = Network Control Protocols- hope this helps :)- miirii
PPP stands for point to point protocol. It's usually used in connection to modems; it allows the computer to hook up a network without being connected.
SLIP
The full form of PPP is Point-to-Point Protocol. It is a data link protocol used to establish a direct connection between two nodes in a network. PPP is commonly used in connecting computers to the internet via dial-up or dedicated connections.