By Man Young Rhee(auth.)
ISBN-10: 1118496531
ISBN-13: 9781118496534
ISBN-10: 1118512928
ISBN-13: 9781118512920
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Additional resources for Wireless Mobile Internet Security, Second Edition
Sample text
If it cannot pass the datagram through any available physical network, it discards the datagram and sends an ICMP error message to the source host. The third bit is called the more fragment bit. If its value is 1, it means the datagram is not the last fragment; there are more fragments to come. If its value is 0, it means that it is the last or only fragment. • Fragmentation offset (13 bits). The small pieces into which a datagram is divided are called fragments, and the process of dividing a datagram is known as fragmentation.
This layer consists of the IP and the ICMP. 3 Transport Layer The transport layer delivers data between two processes on different host computers. A protocol entity at this level provides a logical connection between higher-level entities. Possible services include error and flow controls and the ability to deal with control signals not associated with a logical data connection. This layer contains the TCP and the User Datagram Protocol (UDP). 4 Application Layer This layer contains protocols for resource sharing and remote access.
This 16-bit field specifies to identify a datagram originating from the source host. The ID field is used to help a destination host to reassemble a fragmented packet. 1 Type of service (TOS) TOS bit Description 0000 0001 0010 0100 1000 Normal (default) Minimize cost Maximize reliability Maximize throughput Minimize delay TCP/IP SUITE AND INTERNET STACK PROTOCOLS 19 sent by a source host. The combination of the identification and source IP address must uniquely define the same datagram as it leaves the source host.