2 cfr 200 301

2 cfr 200 301

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3) TCP sends a connection request segment to the remote host, that is, sends an IP datagram with the above IP address ( we will discuss the details of completing this process in Chapter 18 ). RARP format packet ARP packet is substantially uniform (see FIG. 4 - 3 ). The main difference between them is that the frame type code of the RARP request or response is 0 x 8 0 3 5 , and the operation code of the RARP request is 3 , and the response operation code is 4 . In Section 3.4 , we will further introduce the concept of subnets after introducing IP routing. FIG 3--9 gives several specific IP Address: network number and host number of full 0 or all 1 . 2) The FTP client requests TCP to establish a connection with the obtained IP address. tcpdump At 3 indicated line IP length of the data packet is 65 bytes, rather than a UDP datagram (actually a Full host address matching is performed before network number matching. Select the default route only when they all fail. The default route, and the ICMP indirect message sent by the next station router (if we choose the wrong default route for the datagram), are powerful features in the IP routing mechanism. We discuss them in Chapter 9 . Each frame starts and ends with the flag character 0 x 7 e . This is followed by an address byte, whose value is always 0 x ff , and then a control byte with a value of 0 x 0 3 . Local, then generally a "host unreachable" or "network unreachable" error is returned to the application that generated the datagram . Line 3 is the first TCP segment requesting a connection . Its destination hardware address is the destination host (svr 4) . We will discuss the details of this paragraph in Chapter 18 . In each line, the number after the line number indicates the time (in seconds) that tcpdump received the packet. With the exception of line 1 , each line contains the time difference (in seconds) from the previous line in parentheses. As can be seen from this figure,2 cfr 200 301, the delay between sending an ARP request and receiving an ARP reply is 2.2 ms . The first TCP message is sent after 0.7 ms . In this example, the time for dynamic address resolution using ARP is less than 3 ms .

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