ccna 2 chapter 4 pdf

ccna 2 chapter 4 pdf.There are several less obvious elements to the rationale for the reverse ARP process. First, the reverse ARP message announces the IP address of a router while the frame runs through the PVC. The receiving router gets that IP address from the message, noting the DLCI of the InARP frame. for example, based on Figure 144.Mayberry sends an InARP with 199.1.1.1; Mount Pilot receives the InARP, noting the DLCI 51 in the header, so that MountPilot's mapping lists 199.1.1.1 and DLCI 51.The Mount Pilot 199.1.1.2 sends an InARP, the Mayberry receives the InARP and gets DLCI 52 from the header, so the Mayberry's mapping lists 199XPXP1.2 and DLCI 52.(2 ) Static Frame Relay MappingThe user can statically configure the same mapping information without using reverse ARP. in a real-world network application, the user might only think of using reverse ARP. for the exam, the candidate must know how to configure the static mapping command statement. Example 14-7 lists the static Frame Relay mapping for the three routers shown in Figure 14-2 and the configuration used to disable reverse ARP.This example helps us better understand the ftame-relaymap command, bow|using the entry for 199.1.1.2 for sending packets in the Mayberry to MountPilot0 When the Mayberry creates a frame relay header with the intention of sending it to MountPilot, the Mayberry must use DLCI 52. Mayberry's frame-relay map statement associates MountPilot's IP address 199.1.1.2 with the DLCI 52 used to reach MountPilot14.2 Basic content 297come.298 Chapter 14 Implementing Frame Relay Another example, Mount Pilot's command frame-relay map IP 199.1.15 broadcast, this command creates a mapping entry and when MountPilot sends a packet to 199.1.1.1 (Maybeny), it uses the DLCI51OThe mapping is required for each next-hop Layer 3 address that is routed by the Layer 3 routing protocol. Even for such a small network, the configuration process can be laborious. Tip: When a router needs to send a broadcast or multicast to an adjacent router, it is necessary to use the keyword on the frame-realy map command