TCP and UDP Headers The UDP header (8 bytes) is considerably much smaller than the TCP header (20 bytes). Both the UDP and TCP header contain 16 bitsourceanddestinationPort fields. The source port field is used to reply to the message. There is a good diagram of both headershere. TCP ...
UDPHeader data(ifany) 16-bitsourceportnumber16-bitdestinationportnumber 16-bitUDPlength16-bitUDPchecksum 8bytes TCPHeader 32-bitsequencenumber 32-bitacknowledgmentnumber options(ifany) data(ifany) 16-bitsourceportnumber16-bitdestinationportnumber 16-bitTCPchecksum16-biturgentpointer 4-bitheader length...
11.2 UDP Header / UDP首部144 11.3 UDP Checksum / UDP检验和144 11.4 A Simple Example / 简单示例147 11.5 IP Fragmentation / IP分段148 11.6 ICMP Unreachable Error (Fragmentation Required) / ICMP不可达差错(需要分片) 151 11.7 Determining the Path MTU Using Traceroute / 用Traceroute确定路径MTU 153...
A diagram of the transaction can be seen in Figure 1. This diagram is very similar to a UDP request with a saving of 66% in packets transferred compared to TCP. Obviously, in cases where a large amount of data is being transferred, there will be more packets transmitted and thus a ...
1.9 Mbufs (Memory Buffers) and Output Processing / Mbuf与输出处理 15 1.10 Input Processing / 输入处理 19 1.11 Network Implementation Overview Revisited / 网络实现概述(续) 22 1.12 Interrupt Levels and Concurrency / 中断级别与并发 23 1.13 Source Code Organization / 源代码组织 26 1.14 Test Network...
11.2 UDP Header / UDP首部144 11.3 UDP Checksum / UDP检验和144 11.4 A Simple Example / 简单示例147 11.5 IP Fragmentation / IP分段148 11.6 ICMP Unreachable Error (Fragmentation Required) / ICMP不可达差错(需要分片) 151 11.7 Determining the Path MTU Using Traceroute / 用Traceroute确定路径MTU 153...
1.6 System Calls and Library Functions / 系统调用和库函数 7 1.7 Network Implementation Overview / 网络实现概述 9 1.8 Descriptors / 描述符 10 1.9 Mbufs (Memory Buffers) and Output Processing / Mbuf与输出处理 15 1.10 Input Processing / 输入处理 19 ...
Ports are implemented at the transport layer as part of theTCP or UDP headeras shown in the schematic below: The TCP/IP protocol supports two types of port-TCP PortandUDP Port. TCP –is for connection orientated applications. It has built in error checking and will re transmit missing packe...
For brevity, three abbreviations are used for three types of message that control transitions between states, which correspond to the TCP header flags that are set to indicate a message is serving that function. These are:SYN: A synchronize message, used to initiate and establish a connection. ...
The actual user data appears after the end of the header. What is UDP? UDP (User Datagram Protocol)consists of fewer fields compared to TCP. The reason for that is because certain data types do not require reliable delivery and extra overhead. Real-time traffic for example, needs to be ...