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14. TCP/IP Protocol Suite

11/10/2010114. TCP/IP Protocol SuiteContentsa. TCP/IP Internet OSIb. Network level IP protocolc. Addressing and sub-networksd. Other network-level protocolseTransport level11/10/20102a. TCP/IP Internet OSIb. Network level IP Protocol 11/10/20103 Position of IPv4 in TCP/IP Protocol suiteIPv4 datagram format11/10/20104 Service type or differentiated servicesThe precedence subfield was part of version 4, but never of serviceDefault types of service11/10/20106 Values for codepointsThe total length field defines the total length of the datagram including the of a small datagram in an Ethernet frameProtocol field and encapsulated data11/10/20108 Protocol valuesAn IPv4 packet has arrived with the first 8 bits as shown:01000010 ThididthktWh ?

How many hops can this packet travel before being dropped? The data belong to what upper-layer protocol? Solution To find the time-to-live field, we skip 8 bytes. The time-to-live field is the ninth byte, which is 01. This means the packet can travel only one hop. The protocol field is the next byte (02), which means that the upper-layer ...

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