1. Preface 3
2. Alarm Information 3
3. Detection of NFR 4
4. Protocol Analysis 8
5. Vulnerability Description 15
6. Vulnerability Analysis 18
7. Summary 20
1. Preface
NFR (Network Flight Recorder) is an established business networking IDs product that was originally created by Firewall's cattle man Marcus J. Ranum, and is implemented as a generic network traffic analysis and recording software. To maximiz
1. Foreword 3
2. Alarm Information 3
3. Detection of NFR 4
4. Protocol Analysis 8
5. Vulnerability Description 15
6. Vulnerability Analysis 18
7. Summary 20
1. Foreword
NFR (Network Flight Recorder) is an established commercial network IDs product, originally created by firewall's cattle Marcus J. Ranum, as a general-purpose network traffic analysis and recording software. To maximize the flexibility of t
For the interview, child thread 2 executes 10 sub-threads 2 execution 20 times 100 times with the main thread to loop the execution 50 times publicclassinterview{publicstatic Voidmain (String[]args) {finalbusinessb=newbusiness ();new Thread (Newrunnable () {@Overridepublic voidrun () {for (inti=1; iThis article comes from "either desperately, or roll back!" "Blo
whether a bit is a single bit of 2 groups. */intFindbit1 (intN) {//Find out low start first 1 bit, other clear 0 returnn~ (N-1);//N-n can also}voidFindtwo (intA[],intN) {intANS1 =0, Ans2 =0;intFlag = FindOne (A, n);//All XOR, result =a^b other becomes 0;Flag = FINDBIT1 (flag); for(inti =0; I if(A[i] flag) ans1 ^= a[i];ElseAns2 ^= A[i]; }coutcout//Three. Find the number of 3 occurrences 1 times/ * This is more difficult because it cannot be divide
get the number of times an application runs, if more than 5 times, give the number of times the usage has been registered, and do not run the program againImport Java.io.file;import java.io.fileinputstream;import java.io.fileoutputstream;import java.io.IOException; Import Java.util.properties;public class Test5 {public static void main (string[] args) throws Exce
This article was originally published in my technical blog at javaeye.
One of the 12 table tennis balls (or gold coins) is a defective item. The weight is different from that of other balls (but I don't know whether it is light or heavy, it can be called several times to see which ball is a bad ball.
This question was published on the BBS of the University a long time ago. I cannot find it, and it is not difficult to write it again.
Actually can be
1-9 These 9 numbers are divided into three 3-digit numbers, the first of which is the second to third twice times, and 3 times times void Mygetthreenum () { int j,k; int Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced. Snail-1-9 The 9 numbers are divided into three 3 digits, the first one is tw
Many students write this code is easy to write confused. In fact, as long as the following steps of analysis, you will find that the problem is very simple.
1 clearing cycle 50 times and child threads run 10 times, main thread run 100 times, don't cross together
A loop of 50 times can be considered a caller action, the
known as the artifact; I use the next, feel pretty good, is the label is not too suitable, recommend this.Part 2 PhotoshopSeveral design sizes are now commonly used1. The size of the 640*960 4 era, just touch the app design is this size, the era of quasi-material prevalence (now with this size design should be relatively few bar);2.640*1136 5/5s/5c,iphone Update, we have to follow the design with the times (should still be used in this design size),
Talk about how to invest through the fund to reach 10 years 10 times times.
Original Hulk Planet
2018-05-09Author Zheng Zhiyong
Recently to participate in an event, to tell people how to fund investment. In order to attract the eyes must have a title party, the topic is how to vote through the fund to 10 years 10 times times
axis a1,a2:
1.
(a>0)
2. Parametric equation
(a>0)
Vertex
Focus Parameters:
4. Tangent line of parabola
(1)
The tangent (MT) equation is:
If the slope of the tangent is k, then the tangent equation is:
The angle between the focus radius of the tangent MT and the diameter of the M point
And everything that is parallel to MT is halved by the diameter of the M-point.
(2)
The angle between the two tangent lines of a parabola is equal to half the angle of the focus radius of the two tangent,
TCP three handshake and four wave of the whole process
TCP is the host to the host Layer Transmission Control Protocol, providing a reliable connection service, with three handshake confirmation to establish a connection:
Bit code is the TCP flag bit, there are 6 kinds of representations:
SYN (Synchronous establish connection)
ACK (acknowledgement indicates response, confirmation)
PSH (push indicates data transfer)
FIN (finish close connection)
RST (reset indicates connection reset)
URG (Urgen
Turn from: 52928864After learning the bit operations, you will often encounter a class of questions about finding missing integers.The first class is to give you an array that tells you what the range of these numbers is, and then lets you look for this missing number (for example, the range of unordered arrays is from 1 to 10, not repeating 9 numbers). The solution to this type of problem is more diverse, the first, because given the range can be calculated by calculating the sum of the numbers
all it costs, including the purchase of the following two:
Buy windows copyright for each server running FMS
About $4000 for one FMS-specific copyright, due to our size, we have to buy hundreds of copyrights and increase every day.
All these costs are beginning to accumulate. Aside from the cost, FMS is a relatively lame product, especially in terms of its functionality (I'll talk about this later in detail). So I decided to abandon the FMS and write my own rtmp parser from
the optimization of about 50s, optimized after the first 0.3s, the second 0.1s, the optimized execution speed is 100 times times more, Io from 100% to less than 1% on the SSD machine testing, optimization before the need for 7s, Optimization after the first 0.3s, the second 0.1s, the optimized execution speed is 10 times tim
At present, it can be realized: MD5 algorithm, SHA256 algorithm, first MD5 SHA256, SHA256 after MD5, two MD5, two times SHA256, 8-bit MD5 algorithm after the first 8-bit SHA256, 8-bit SHA256 algorithm after the former 8-bit MD5 algorithm, Password the last character of the ASCW value and the remainder of 8 as the encryption scheme coefficient, 16-bit MD5 encryption, 32-bit MD5 encryption, 8-bit SHA256 encryption, 16-bit SHA256 encryption, 24-bit SHA25
weight of each commodity, where the I integer represents the weight of the commodity labeled I weight_i.The 3rd behavior of each set of test data is an integer q, which indicates the sum of the number of times that a small hi has been queried and the number of times the weight of the product has been changed.Each group of test data n+4~n+q+3 line, each line describes an operation, each line begins with a n
Tags: redis Mysql distributed databaseRedis is an open source API that is written in ANSI C, supports the web, can be persisted in memory, key-value databases, and provides multiple languages. Learning Video: HTTPS://PAN.BAIDU.COM/S/17NO3PG9HRL-RTU0BWATYLW Redis is also something that MySQL DBAs should be familiar with Redis is a high-performance Key-value database. The emergence of Redis, to a large extent, compensates for the lack of memcached such keyvalue storage, in some cases can be a good
serialization, what problems deserialization will encounter, and how to resolve it.Http://www.importnew.com/17964.htmlJVM knowledgeWhat happens when a stack memory overflow occurs.A Stackoverflowerror exception is thrown if the thread requests a stack depth that is greater than the depth allowed by the virtual machine. Throws a OutOfMemoryError exception if the virtual machine cannot request enough memory space in the dynamic expansion stack.Reference: http://wiki.jikexueyuan.com/project/java-v
This is a previously encountered SQL interview problem, for reference learning:Find project IDs where all project start times are smaller than previous project end timesMysql> Select * fromT2;+----+---------------------+---------------------+|Id|Start| End |+----+---------------------+---------------------+| 1 | -- on- on xx:xx:xx | -- on- in xx:xx:xx || 2 | -- on- on xx:xx:xx | -- on- A xx:xx:xx || 3 | -- on-Geneva xx:xx:xx |
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