200-301 nuggets

200-301 nuggets.If the destination is not local, send to the default router (default gateway).a.Find the MAC address of the default router. Use a known ARP table entry, or use an ARP message for the information.b.Encapsulate the IP packets in the data link frame with the destination data link address of the default router. These detailed steps listed provide a good summary of the IPv4 routing logic, and the left figure in Figure 4-2 summarizes the major decisions. In the figure.1.2 Basic content 89shows that host A sends local packets directly to host D,for packets to host B - the other side of the router, as90 Chapter 4, Part 1 Troubleshooting IPv4 Routing This is located on a different subnet a host A sends the packet to the default router (R1).Figure 4-2 Summary of Host Routing LogicThe routing logic routers used by IPv4 routers can act independently, i.e., a router is required to traverse its own logic without the help of other routers when routing individual packets. At the same time, routers can interact with each other. Routers forward packets to each other, ultimately causing the packet to arrive at the correct destination host. The independent behavior of each router forwards packets to the destination host via end-to-end routing.The next topic will discuss what routers do when routing packets - first in a separate process on one router and then affecting the global. IP Routing Logic on a Single RouterRouters require a little more work to perform routing operations on IPv4 packets than hosts. While a host can simply use the IP packets in memory as a starting point, a router has to do the most important work before it can get to this stage: matching them to the IP routing table. The specific steps are shown below.