ports and protocols

IICVsSPIToday, in low-end digital communications applications, we are seen in IIC (inter-integrated circuit) and SPI (Serial peripheral Interface). The reason is that these two communication protocols are ideal for near- low-speed inter-chip communication. Philips (for IIC) and Motorola (for SPI) have developed both standard communication protocols for different backgrounds and market requirements.IIC was d

1. Network Protocol (PMTOCOL)The so-called network protocol is a set of rules, standards, or conventions established for the exchange of data in a computer network. A protocol always refers to a layer of protocol,accurately, it is a collection of communication rules and conventions that are developed for communication between the same layer entities. The network protocol consists of three elements:① semantics include control information for various frame headers and processing. ② syntax includes

////Dog.h//oc2_ using System Protocols////Created by zhangxueming on 15/6/24.//Copyright (c) 2015 zhangxueming. All rights reserved.//#import@interfaceDog:nsobject @property (copy, nonatomic) NSString*Name: @property (Assign, nonatomic) Nsinteger age;@end////DOG.M//oc2_ using System Protocols////Created by zhangxueming on 15/6/24.//Copyright (c) 2015 zhangxueming. All rights reserved.//#import "Dog.h"@imple

Tcpdump is a basic tool for network protocol analysis. Tshark is the command line version of wireshark (formerly known as ethereal), a well-known open-source network protocol analysis tool. wireshark can decode and analyze thousands of network protocols. Wireshark and tcpdump both use the libpcap library (see the libpcap programming tutorial) for network packet capture. TCPDUMP details m Tcpdump is a basic tool for network protocol analysis. Tshark is

The routing information protocol, which is a very common and important protocol. If you want to learn the routing protocol well, you must understand the concept of this routing information protocol. Now let's take a detailed analysis. The routing information protocol was originally designed for Xerox PUP (PARC universal protocol). the routing information protocol was collectively referred to as "GWINFO" in the Xerox network system protocol in 1981 ", it was also defined as "RFC 1988" in 1058. th

are almost useless. The most serious problem is that the WebSocket protocol itself is still a draft, so the Protocol versions supported by different browsers are different, safari 5.1 supports the old version protocol Hybi-02, Chrome 15 and Firefox 8.0 support the new version protocol Hybi-10, the old version protocol and new version Protocol have different requirements on the handshake Method for communication establishment and data transmission formats. As a result, most of the implementation

As the popularity of virtualization accelerates and applications in VMware environments become more prevalent, it is absolutely necessary to research and test storage protocols in VMware environments, in particular the three storage protocols: Fibre Channel, iSCSI, and Nas (NFS). Through research and testing in VMware environments, users can better understand the storage requirements of their virtualized en

Because smart switching performs simultaneous data exchange on most ports, it requires a wide switching bus bandwidth. If a layer-2 switch has N ports, multiple Access ports and low prices provide a perfect solution for small network users. In order to ensure the key services of users and treat users of different levels differently, a broadband IP network is requ

Currently, the most common Trojan Horse is based on the TCP/UDP protocol for communication between the client and the server. Since the two protocols are used, it is inevitable to open the listening port on the server side (that is, the machine where the trojan is planted) to wait for the connection. For example, the monitoring port used by the famous glaciers is 7626, And the Back Orifice 2000 is 54320. Then, we can check whether a trojan or other ha

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you find the original-j reject a class of statements, the above two sentences to put in front of it2. Open the network port command line mode for external access:/sbin/iptables-i input-p TCP--dport 80-j ACCEPT #开启80端口/etc/rc.d/init.d/iptables Save #保存配置/etc/rc.d/init.d/iptables Restart #重启服务3. See if the Linux view port is occupiedNetstat-lntupDisplays all the ports and all the corresponding programs, using the GREP pipeline to filter out the key fie

Netstat/lsof The netstat command is used to display statistics related to IP, TCP, UDP, and ICMP protocols, and is typically used to verify network connectivity across ports on the local computer. -a displays a list of all valid connection information (including established connections, including those that listen for connection requests) -N Shows all valid connections established -T TCP protocol

Hadoop-definitions of Computer Network PortsPort Introduction The ports described in this article are all logical ports, which refer to the ports in the TCP/IP protocol. The port number ranges from 0 to 65535, for example, port 80 used to browse Web Services, port 21 for the FTP service. Here we will introduce the logical port.A. Distribution by port number (1) W

FCoE vs iSCSI After discussing the fusion mode, we can finally talk about whether to choose iSCSI or FCoE. The following are four main considerations: 1. Data center strategy, 2. Performance Requirements, 3. Compatibility goals, 4. Cost issues. In any situation, these four factors are very important for selecting FCoE or iSCSI, and the final decision can be made without any factors. In some cases, FCoE may be cheaper than iSCSI, and vice versa. Figure 6 multi-faceted SCSI No matter which protoc

The use of SAN multi-protocol is based on fiber channel. So what should I pay attention to when using some routes and switches for such optical fiber transmission? Next we will elaborate on this part. This great career of Kumar Malavalli originated from his comparison and Investigation of the world's popular network technologies represented by Ethernet and the channel technologies represented by SCSI ｡ He attempted to create an advanced network architecture based on the advantages of the network

Adding Internet applications to communication applications suddenly expands the communication space. The vast transmission space of the Internet has made communication a huge step forward. Now let's take a look at the basic principles and usage of TCP and UDP protocols in GPRS. GPRS is used in personal business networks, mainly for webpage access, sending and receiving mails, and various applications have fixed pr