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Network Technology and Application Study Notes-Overview of Computer Network Basics

3640 Vswitch: Cisco 3560, Cisco 3750, and Huawei 9306 Switches 2Network Security Device Firewall:Attackers can defend against attacks from the company's internal and external networks. Cisco ASA 5505, 5510, 5520, 5540, 5550, 5580 VPNDevice:Virtual Private channel through the Internet 3And wireless network devices:Wireless Router (TP-LINK), wireless network card, Wireless Bridge 4Network device manufacturer:CiscoCompanies, Huawei companies Vi. Networ

Network Technology and Application Study Notes-Overview of Computer Network Basics

3640 Vswitch: Cisco 3560, Cisco 3750, and Huawei 9306 Switches 2Network Security Device Firewall:Attackers can defend against attacks from the company's internal and external networks. Cisco ASA 5505, 5510, 5520, 5540, 5550, 5580 VPNDevice:Virtual Private channel through the Internet 3And wireless network devices:Wireless Router (TP-LINK), wireless network card, Wireless Bridge 4Network device manufacturer:CiscoCompanies, Huawei companies Vi. Networ

C # Regular Expression Learning (2)

: Example Remove the non-HTML code section in the String test = "String resultstr = RegEx. Replace (test, @ "Output: display type 5. Segmentation RegEx. Split Note: When a capture group is used in split, the split array also contains the content of the capture group. Even if a zero-width capture group is used, the content of the capture group is saved to the result array. Example When a capture group does not existString test = "AA String [] temp = RegEx. Split (test, @ "Foreach (st

(go) How Linux makes history not log sensitive commands

Sometimes for server security, to prevent others from prying into the commands we enter, we can clear the history, and more often we choose to force history to not remember the command when entering special commands. Experimental method: Execute the Export histcontrol=ignorespace command first, then output Ls-tra, PWD and service mysqld Start command, when the third command is executed, we choose not to remember the command. #export histcontrol=ignorespace #ls-ltr Total 168 -rw-r--r--1 root r

VB implement mouse drawing instance code _VB

This paper describes the implementation of the mouse drawing example for VB, this instance enables line color and line width to be set, and when the mouse button is pressed, the drawing begins and records the initial starting point, and if it is not in the drawing state, exit the process, and if it is in the drawing state, draw a line from the starting point to the point where the mouse is present, The current mouse location is then used as a new starting point, and the drawing ends when the mou

Elimination of Oracle build errors

An Oracle library error was excluded and the following process could not be assigned a port resolution within the specified scope Install the Oracle database a few days ago. Follow the instructions to configure the Linux environment, install the RPM, and then install the 10.2.0.1 installation package, and then install the 10.2.0.4 patch, and finally play em patch. It's all right. I started to create the database with DBCA, and the result reported the following error: 1 Critical: Unable to all

Optimize synchronization speed for MySQL slave

|8192b 1416k|1028b 170b| 0 0 | 404 5520 1 0 0|8192b 1128k|1031b 170b| 0 0 | 331 4471 1 Wuyi 0 0|8192b 1160k|1185b 170b| 0 0 | 340 4581 1 50 49 0 0| 0 1120k| 633B 170b| 0 0 | 326 4531 0 0 0|8192b 656k|8886b 170b| 0 0 | 221 2881 1 0 0|8192b 1128k|1619b 170b| 0 0 | 335 451 Slave1 can achieve 9M per second write Io, and slave2,3 can only reach 1M per second, IO performance is much worse, later analysis of the next storage, found that there is a great diff

Native JavaScript for AJAX, JSONP

地址 type: ‘POST‘, // 请求类型,默认"GET",还可以是"POST" data: {‘b‘: ‘异步请求‘}, // 传输数据 success: function(res){ // 请求成功的回调函数 console.log(JSON.parse(res)); }, error: function(error) {} // 请求失败的回调函数});Second, JSONPHomologous policyAjax needs "cross-domain", the culprit is the browser 同源策略 . That is, the Ajax of a page can only get data from the same source or the same domain as the page. How to call "homology" or "Same domain"? -- 协议、域名、端口号都必须相同 . For example:http://example.com 和 https://example.com 不同,因

How to simplify Web application optimization

--, Congratulations! This HTML file has a total of 9441 bytes, less than 20K. If you specify the height and width of the picture, this size allows the page to display in 8 seconds-the average time the user is willing to wait for the page to appear. images_size--, Congratulations! The total size of the picture is 3732 bytes, less than 15K. Ideally, each picture should be less than 1160 bytes in order to meet the requirements of a TCP-IP package. script_size--, Congratulations! All external script

Ways to simplify Web applications

20K. If you specify the height and width of the picture, this size allows the page to display in 8 seconds-the average time the user is willing to wait for the page to appear. images_size--, Congratulations! The total size of the picture is 3732 bytes, less than 15K. Ideally, each picture should be less than 1160 bytes in order to meet the requirements of a TCP-IP package. script_size--, Congratulations! All external scripts are 2374 bytes and less than 4080 bytes. It meets the requirements of

Introduction to Cisco DNA

Tags: managed pat LOB Ubuntu OSS SDN img proc I/OThe Cisco Application Policy Infrastructure Controller Enterprise Module (APIC-EM) is a software-defined network (SDN) controller that coordinates and manages the local area network (LAN) and wide area network (WAN) comprised of Cisco infrastructure. Apic-em hosts a large number of embedded services, including (but not limited to) network PNP, path tracking, PKI certificate infrastructure, and network assets. You can view all of these apps from th

Start Oracle11g Service

password: email Address of the notification (optional): SMTP server of the notification (optional ): ------------------------------------------------------------------- you have specified the following settings for the database ORACLE_HOME ................ e: \ app \ User \ product \ 11.1.0 \ db_1 local host name ................ HT-1376 listener port number ................ 1521 database SID ................ email Address of the orcl notification ............... notification sending (SMTP) ser

Install, configure, and set the encoding format for mysql 5.6.20.

command again and change it to gbk. Note: As shown above, character-set-client = gbk is used by default and no changes have been made. If there are other codes, it is also a unified code to access the client. Open the data folder in the mysql installation directory and find the database you created. For example, test. Open the test file and find db. opt. open the file and change it to default-character-set = gbk. Default-collation = gbk_chinese_ci If you want to set it to utf8 encoding, modify

An Oracle database creation error cannot be rectified by allocating ports to the following processes within the specified range.

If an Oracle database creation error occurs, you cannot allocate a port to the following processes within the specified range. Configure the Linux environment, install rpm, install the 10.2.0.1 installation package, install the 10.2.0.4 patch, and then install the em patch. All of this is normal. I started to use dbca to create a database. The error is as follows: 1 serious: The following process cannot be allocated a port within the specified range: JMS [5540-5559]. RMI [

Xiangpeng aviation's system SQL injection (you can run the SQL-shell command)

|+----------------------------------------------------+---------+| events_waits_summary_by_thread_by_event_name | 5520 || events_statements_summary_by_thread_by_event_name | 3300 || events_stages_summary_by_thread_by_event_name | 2160 || events_statements_summary_by_digest | 1311 || events_waits_summary_by_account_by_event_name | 552 || events_waits_summary_by_host_by_event_name | 552 || eve

Network test steps

1:TCP protocol: For example, test the port number on the 182.92.99.34 55220 Port Pass No, can be divided into several steps:Preparatory work:(1) First put the 182.92.99.34 computer on the use of 5520 of this port software off (the general opening is to install the corresponding application, the basic is not installed software, so there is no such a step);(2) If the 182.92.99.34 computer has been designated, it is best to confirm the next IP to not, th

How to make a history record do not log sensitive commands

sometimes for server security, to prevent others from prying into the commands we enter, we can clear the history, and more often we choose to force history to not remember the command when entering special commands. Experimental method: Execute the Export histcontrol=ignorespace command first, then output Ls-tra, PWD and service mysqld Start command, when the third command is executed, we choose not to remember the command. [[Email Protected]_96_242_centos ~]#Export Histcontrol=ignorespace[[Ema

Start of oracle11g Learning Service

: specified port 5540 Already in use. 2013 -4 - 16 17 : 05 : 11 Oracle. sysman. emcp. util. portmanager isportinuse warning: specified port 5520 Already in use. 2013 - 4 - 16 17 : 05 : 11 Oracle. sysman. emcp. util. portmanager isportinuse warning: specified port 1158 Already in use. 2013 - 4 - 16 17 : 05 : 12 Oracle. sysman. emcp. util. dbcontrolutil stopoms information: the database control is being stopped (this operation may take

Questions about Oracle IP address Modification

. emcp. emconfig performInformation: The operation is being recorded in c: \ oracle \ product \ 10.2.0 \ db_1 \ export toollogs \ emca \ orcl \ eMca_2009-11-25_14-23-10-Afternoon. log.14:23:10 oracle. sysman. emcp. util. portmanager isportinuseWarning the specified port 5540 is in use.2009-11-25 14: 23: 10oracle. sysman. emcp. util. portmanager isportinuseWarning the specified port 5520 is in use.2009-11-25 14: 23: 10oracle. sysman. emcp. util. portma

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