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ccna 200 301 bookshelves walmart for hanging.The survival time is set in the packet just as soon as it is generated. the survival time value is set in the packet. If the TTL has timed out and the packet has not reached the destination it wants to go to, sip - the packet is dropped. The survival time prevents the packet from continuing to be sent in a loop through the network.The port number of the protocol's upper layer (TCP uses port 6, UDP uses port 17), which also supports network layer protocols such as ARP and ICMP (some parsers refer to this field as "type").We'll explore this field in more depth in a moment, because it's really important. But for now it's enough to know that this field tells the IP protocol to whom the packet load belongs (e.g. TCP, UDP, ICMP, etc.).The header checksum contains only the CRC (cyclic redundancy check) checksum of the header. Source IP Address The 32-bit IP address of the sender's device. Destination IP Address The 32-bit IP address of the destination device to which the packet is destined. The options are used for network testing, debugging (debugging), security, and other purposes. The data is the upper layer data after the IP Optional field. Here's a look at the IP packets captured in the network analyzer (all the fields mentioned earlier are shown)IPHeader -InternetProtocolDatagram Version: 4 HeaderLength: 5Precedence: 0 TypeofService: %000 Unused: %00TotalLength: 187 Identifier: 22486 FragmentationFlags: %010 Do Not Fragment FragmentOffset: 0In Figure 4.8, the protocol field tells the IP protocol to send data to TCP port number 6.Protocol field tells the IP protocol to send data to TCP port number 6 or UDPBut when this data is part of a data stream going to an upper layer