数据链路层主要功能:封装成帧,透明传输,差错检测。网络层功能:路径的选择,数据的转发。 运输层:负责向两台主机中进程之间的通信提供通用的数据传输服务。传输层主要有两种协议:传输控制协议TCP,用户数据报协议UDP应用层:面向用户,提供应用程序,实现网络服务。
The rest match up based on their names: network layer to network layer, transport layer to transport layer, and so on.However, while they may have many similarities, the two models have many differences as well. For example, the TCP/IP model is more reliable than the OSI model, and it...
Transport layer. In the transport layer, the data gets encoded so it can be transported through the internet using either theUser Datagram Protocol (UDP)or TCP. Network access layer. In the network access layer, the data gets a header and a trailer, and these tell the data where to go....
UDP用户数据报的首部中长度字段定义了数据报的总长度,即首部加数据部分。 UDP用户数据报的首部中检验和用来检验整个用户数据报(首部加数据部分)出现的差错。计算伪首部可以增加可靠性。 ( 4 + 4 + 1 + 1 + 2 )+(2 + 2 + 2 + 2 )= 20 伪首部的作用是用于检验UDP数据报已经到达正确的目的地,即正确的...
TheTCP/IP and OSI models have similarities and differences. The main similarity is in the way they're constructed to both use layers, although TCP/IP consists of just four layers, while the OSI model consists of the following seven layers: ...
Related post:SSH VS SSL: Differences and Similarities Between Them TCP is connection-oriented and can establish a connection between the client and server before sending data. Before establishing a connection, the server must be listening (passive open) for connection requests from the client. Three...
Can be TCP, UDP, ICMP, or all. Example: -P tcp -S address[/mask] [port] Source IP address that this rule will match. A netmask of "/32" will be assumed if you don't supply one. You may optionally specify which ports this rule will apply to. You must also specify the protocol...
OSI和TCP / IP参考模型的比较 (Comparison of OSI and TCP/IP Reference Model) Now it's time to compare both the reference model that we have learned till now. Let's start by addressing the similarities that both... 计算机的OSI和TCP/IP网络模型 ...
non-malicious usage: this technique essentially gives browsers full TCP and UDP socket capability to communicate to any protocol locally on the system; the connection can be abstracted through a cloud server that connects back but the browser just talks to the cloud server as if it's the socket...
Figure 3 - The Kernel Data Structures for TCP and UDP Protocol Control Blocks as seen in FreeBSD Triggering the Vulnerable Code and PSOD In order to trigger the vulnerable code path, we need to create a UDP socket and then manipulate the socket using thesetsockoptsystem cal...