UNIX Network Programming Volume 1, Third Edition [Electronic resources] : The Sockets Networking API نسخه متنی

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UNIX Network Programming Volume 1, Third Edition [Electronic resources] : The Sockets Networking API - نسخه متنی

Addison Wesley

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Chapter 2


2.1

Visit 2.2

All RFCs are available at no charge through electronic mail, anonymous FTP, or the Web. A starting point is 2.3

With IPv4, this generates a 576-byte IP datagram (20 bytes for the IPv4 header and 20 bytes for the TCP header), the minimum reassembly buffer size with IPv4.

2.4

In this example, the server performs the active close, not the client.

2.5

The host on the token ring cannot send packets with more than 1,460 bytes of data because the MSS it received was 1,460. The host on the Ethernet can send packets with up to 4,096 bytes of data, but it will not exceed the MTU of the outgoing interface (the Ethernet) to avoid fragmentation. TCP cannot exceed the MSS announced by the other end, but it can always send less than this amount.

2.6

The "Protocol Numbers" section of the Assigned Numbers Web page (2.7

A selective acknowledgment only indicates that the data covered by the sequence numbers reflected in the selective acknowledgment message was received. Only a cumulative acknowledgment says that the data up to and including the sequence number in the cumulative acknowledgment message was received. When freeing data from the send buffer based on a selective acknowledgment, the system may only free the exact data that was acknowledged, and not any before or after the selective acknowledgment.


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