200-301 objectives

200-301 objectives., . /win. Step 1 For each data link frame received, choose whether to process the frame and if so, use the following processing. I calyx edit a. The frame has no errors (via the data link tail frame check sequence or the FCS domain). b.The destination data link address of the frame is the address of the router (either multicast or broadcast). Step 2 If you choose to process the frame from step 1, unblock the packet from inside the data link frame. Step 3 Make a routing decision. To do so, the destination IP address of the packet is compared to the routing table in order to find a route that matches the destination address. This route identifies the router's output interface and the possible presence of a next-hop router. Step 4 Encapsulate the packet into an appropriate data link frame in the output interface. ARP may be required when forwarding to an Ethernet LAN interface if the MAC address of the next device is not in the router's ARP buffer. step 5 Transmit the frame to the output interface as listed in the matching IP route.Tip: The order of the individual steps listed above is not very important. In contrast, the concepts involved in each step are more important. So remember them! As for the exam, it is not necessary to remember which concept corresponds to which step.The details listed above are very accurate, but sometimes it's often more useful to consider them in a simpler way, like this simple summary below.The router receives a frame, removes the packet from the inside of the frame, decides which interface will forward the packet out, puts the packet into another frame and sends that frame (with the packet inside) to the correct router interface.Although it is useful to read the text about how routing works, it is sometimes more useful to view the process through a diagram. The five steps of the routing process described above are broken down in Figure 4-3. A packet arrives in a router from the left and exits from the right. A packet arrives from the left side and enters a router Ethernet interface that contains a destination IP address for the host B address. Router R1 processes the frames and packets as described in the previous 5 steps. Finally, the router forwards the packet, starting in a new High-Level Data Link Control (HDLC) frame and exiting the serial link on the right.1.2 Basic Content 91-...asFigure 4-3 Summary of Router Routing LogicIP Routing from Host to Host