ccna 200-301 cert guide

ccna 200-301 cert guide

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Each router that processes a datagram needs to decrement the TTL value by 1 or subtract the number of seconds that the datagram stays in the router. Because most routers forward datagrams with a delay of less than one second, the TTL eventually becomes a hop counter, and each router that it passes decreases its value by one . In Section 3.4 , we will describe the form of subnets used in this network. At 4.6 in the section sun and netb dial between the SLIP relevant details. Section 2.4 discusses SLIP in detail . Now look at another example: the host bsdi has an IP datagram to be transmitted to the ftp.uu.net host, and its IP address 3) Each link layer may have a different data frame header, and the destination address (if any) of the link layer always refers to the link layer address of the next station. In the example, two Ethernets encapsulate the link-layer header containing the next-station Ethernet address, but the SLIP link does not do so. The Ethernet address is usually obtained through ARP . The IP address. Similarly, the system also provides an inverse function-given the IP address of the host, look at the host name it corresponds to. If we run the same example with the -e option, we can see the full length of each unreachable ICMP port unreachable message. The length here is 70 bytes, and the fields are allocated as shown in Figure 6-9 . The time increases with time. The time stamp on the left of the figure is the same as the output of the tcpdump command (see Figure 6-8 ). The tags at the top of the figure are the host name and port number of both parties in the communication. It should be noted that the y- axis as the page goes down is not proportional to the real time value. When there is a meaningful period of time, in this case it is retransmitted every 5 seconds,ccna 200-301 cert guide, we mark the two sides of the time series. When UDP or TCP data is being transmitted, we use thick lines to indicate it.

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