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Common port functions: Windows Port Encyclopedia

a TCP connection is sent, the data stream that contains the garbage character is known to be closed. Hacker uses IP spoofing to launch a Dos attack. Fake UDP packets between two Chargen servers. Because the server attempted to respond to an unlimited round-trip data communication between two servers one chargen and Echo will cause the server to overload. The same Fraggle DOS attack broadcasts a packet of spoofed victim IP to this port on the destination address, and the victim is overloaded in

PC Port Complete parsing

spoofing can initiate a Dos attack to forge UDP between two Chargen servers due to the server attempting to respond to an unlimited round-trip data communication between two servers a chargen and echo will cause the server to overload. Similarly Fraggle Dos attacks broadcast a packet with a spoofed victim IP to this port on the destination address, and the victim is overloaded to respond to this data. FTP The most common attackers are used to look for ways to open the "anonymous" FTP server. Th

On the pre-parsing mechanism of JavaScript from the difference between Var func=function and function func ()

with Var to the active object's property (that is, add it to the active object) and assign it to undefined, and then define the function Also added to the active object.1 if (false) {2 var aa = 20;3 var bb = 30;4}5 6 function aa () {};7 function bb () {};8 9//var defined AA,BB and function definitions AA (), BB

Go: Anonymous functions and closures

://blog.csdn.net/sunlylorn/article/details/6534610 and http://www.cnblogs.com/rainman/archive/2009/05/04/1448899.html In simple terms:  Because the returned function is assigned a variable, although the function destroys its execution environment at the end of the execution,   However, if there is a closure, the closure saves the active object (variable) of the external function, so if you do not remove the reference to the closure,   Closures persist in memory, and the garbage collector does no

Sixth virtualization Virtual Machine backup VDP

Virtual Machine BackupFirst, Pre-deployment preparation 1. Preparing the environment650) this.width=650; "Src=" https://s3.51cto.com/wyfs02/M02/8C/BB/wKioL1h2NmyCgXLmAACyQPdYQW0999.jpg-wh_500x0-wm_ 3-wmp_4-s_2838726015.jpg "title=" image 1.jpg "alt=" wkiol1h2nmycgxlmaacyqpdyqw0999.jpg-wh_50 "/> 2. Add host records for DNS650) this.width=650; "Src=" https://s3.51cto.com/wyfs02/M00/8C/BF/wKiom1h2NniT-Vs7AAD-eR4TF94847.jpg-wh_500x0-wm_ 3-wmp_4-s_398539

First Assignment C

, the essence is human. A different angle. From artificial intelligence, the computer is stored in the human learning and design indirectly reflect people's learning and reasoning, stored in the computer method. Learning and reasoning can be carried out first in the human mind, again put into the computer stored in the process, but also in the computer according to the design of people in the introduction of new storage. The nature of reasoning, learning and storage requires human thought to des

Nginx Location Rule Priority

The Nginx server searches multiple location blocks in the server block for a standard URI and a request string match, and if there are multiple matches, record the one with the highest matching degree. The server then matches the regular URI in the location block with the request string, and when the first regular URI matches successfully, ends the search and uses the location block to process the request, or if the regular match fails all, This request is processed using the most matching locat

Summary of exception

0. stack unwinding. when an exception is thrown and control passes from a try block to a handler, the C ++ run time CILS Destructors for all automatic objects constructed since the beginning of the try block. this process is calledStack unwinding. Two notes: 1) local objects will be destructed in reverse order; 2) if another exception thrown during stack unwinding in destructing an object, as no one can handle that exception, terminate will be called to end the program.View code Class

Go implementation writes important data to the picture _golang

) { var i int for; I B[i] = Flag[i] } A: = uint32tobytes (length) for; I B[i] = a[i-4] } Return } Func Writeshadow (b []byte, im image. Image) (out image. Image, err Error) { Max: = im. Bounds (). Max.x*im. Bounds (). MAX.Y/8-64 B_len: = Len (b) If Len (b) > Max { return nil, errors. New ("Image does not have enough spaces for shadow.") } Head: = Buildshadowheader (UInt32 (B_len)) var BB byte var BS [8]byte var i int Out, err = SetI

Oracle Sqlplus Formatted OUTPUT command

Oracle Sql> select * from AA; BB CC--------------------1 999999.99 sql> col bb format ' 99.9 '; Sql> select * from AA; BB CC---------------1.0 999999.99 Sql> Col bb head ' 99.9 '; Sql> select * from AA; 99.9 CC---------------1.0 999999.99 Sql> Col BB Head ' School Numb

The uncommon concepts in target detection and classification papers

notation for {:d}/{:d} '.Format (i + 1, len (imagenames))) # Save Logger.info (' saving cached annotations to {: s} '. Format (cachefile)) with open (Cachefile, ' W ') as F:cpickle.dump (RECs, F) Else: # LOA D with open (Cachefile, ' R ') as F:recs = Cpickle.load (f) # Extract GT objects for this class Class_recs = {} NPOs = 0 for imagename in imagenames:r = [obj for obj in recs[imagename] if obj[' name '] = = ClassName] Bbox = Np.array ([x[' Bbox '] for x in R]) difficult = Np.array ([x['

Follow JqueryAPI to learn Jquery selector _ jquery

Jquery selector is the most basic operation. When we use native javascript, we have to spend nine heads and two tigers to choose an object. With Jquery selector, the food is delicious, good health ...... 1. Basic We know that jquery is the most commonly used selector. Let's take a look at the selector in jqueryAPI-there are five situations: class, id, element, *, and a multi-selector, here we want to write the css style Css styles also have several situations: 1. Class styles 2. id styles 3. L

Java_network_java byte order

In the previous two blogs, we introduced byte and network byte. If you are interested, you can access several functions related to java_network_endianness-byte order and java_network_endian. This blog mainly talks about JavaVM and byte sequence. It is explained through an example. We know that the mechanism for storing data in memory varies with different CPUs or different operating systems with the same CPU! But how does the Java Virtual Machine store data? In other words, is the JVM large-end

PHP----String

the location of the last occurrence of the specified string in the target string)Substr_count (' ABCD ',' B ');//1 (counts the number of occurrences of a string)STRCSPN (' Aabb cc ',' C ');//5 (returns the number of characters to find in a string before any specified character is found)STRSPN (' abcdef ',' abc ');//3 (returns the number of specific characters contained in the string)STRSPN (' abcdef ',' BC ');//0STRSPN (' abcdef ',' BC ',1,5);//2Chr $);//a (get ASCII encoding)Ord' A ');//65STRC

Python Web Framework Enterprise actual combat (sixth issue) \ Second Class-pickle&__eq__

queried with ID () if a=b, the address of A and B is the same; if you just want to copy it, you have to use a=b[:]. #-*-coding:cp936-*-#值传递def F1 (aa): Aa=1 print "id (aa) =", id (AA) print AA bb=123print "id (bb) =", id (BB) F1 ( BB) Print bb# Reference pass def f2 (AA): a

Java NIO Reading Notes

) */public class Unsigned{ public static short getUnsignedByte (ByteBuffer bb) { return ((short)(bb.get() 0xff)); } public static void putUnsignedByte (ByteBuffer bb, int value) { bb.put ((byte)(value 0xff)); } public static short getUnsignedByte (ByteBuffer bb, int position) { return ((short)(bb.get (position) (sho

Follow the Jquery API to learn one of the Jquery selectors

With the Jquery selector, the food is delicious and the body is superb ......1. Basic We know that jquery is the most commonly used selector. Let's take a look at the selector in jqueryAPI-there are five situations: class, id, element, *, and a multi-selector, here we want to write the css styleCss styles also have several situations: 1. Class styles 2. id styles 3. Label styles,If there is an aa class, we need to write the aa style as. aa {}If there is a bb

JavaScript Basics (Fifth day)

the road long its repair far XI, I will go up and down and quest!JS Object-oriented and profound, deep inside, will not go and unfavorable, eventually into a generation guru.Appetizer DishesDoes the duplicate declaration of a variable have an effect?var a = {};var A;AA little inspiration?Array Object functions[] {} function X () {}New Array () New Object () New X ()Small problem in front(1) function does not specify a return value, what is returned by default? Undefined(2) JS has a block scope?

jquery Basic Finishing!!

JavaScript jQuery usage and reference order Reference Order:first lead the CSS and then lead JSJS in the first cited jQuery, and then cited jabascript, and then lead their own JSUsage:JQuery needs to introduce a js file, and before all the js Code1. Find the Label:JS : document.getelement .... contains all the search codes Dom ObjectJQuery :$ ( selector ); selector contains ID Selector,class selector jQuery Objectthe following two sentences represent finding a label with ID AA and adding a c

The "thought" nesting list is sorted for an index

Nested list example: [[' AA ', ' BB ', ' 2 "," NN "],[" AA "," BB "," a "," NN "],[" AA "," BB "," a "," NN "],[" AA "," BB "," a "," NN "],[" AA ", "BB", "],[", "nn", "AA", "BB", "I", "nn"] we want to sort the third field of th

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