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TCP vs UDP on video stream
...tivity; therefore TCP is more appropriate for replaying a video-on-demand.
IP multicast significantly reduces video bandwidth requirements for large audiences; TCP prevents the use of IP multicast, but UDP is well-suited for IP multicast.
Live video is normally a constant-bandwidth stream recorded o...
How do I fix the error 'Named Pipes Provider, error 40 - Could not open a connection to' SQL Server'
...g with SERVER/INSTANCENAME when everything is configured correctly, named pipes, user access rights... and suddenly it struck me, it's not a slash, it's a backslash (\).
The horror, the shame...
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创业者：在寻找 不迷茫 - 资讯 - 清泛网 - 专注C/C++及内核技术
...8万，他大呼承受不起。
“现在投资人选项目书都开始用软件选择了。”杨贝明说。据他观察，项目书太多，投资人通过软件设定，直接屏蔽掉他们不喜欢的。另外，来中关村创业大街找项目的真正投资人也已经不多了，大多数...
MySQL CONCAT returns NULL if any field contain NULL
...ONCAT(COALESCE(`affiliate_name`,''),'-',COALESCE(`model`,''),'-',COALESCE(`ip`,''),'-',COALESCE(`os_type`,''),'-',COALESCE(`os_version`,'')) AS device_name
FROM devices
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Permission denied (publickey) when SSH Access to Amazon EC2 instance [closed]
...out which username you should use is often lacking from the AMI Image description. But you can find some in AWS EC2 documentation, bullet point 4. :
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/AccessingInstancesLinux.html
Use the ssh command to connect to the instance. You'll specify the...
Java内存泄露原因详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...通过垃圾回收机制完成的。GC为了能够正确释放对象，会监控每个对象的运行状况，对他们的申请、引用、被引用、赋值等状况进行监控，Java会使用有向图的方法进行管理内存，实时监控对象是否可以达到，如果不可到达，则就...
How to detect the physical connected state of a network cable/connector?
...nected state of an RJ45 connector to its socket. Preferably using BASH scripting only.
14 Answers
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how to detect search engine bots with php?
...s user agent with fake name and name it like "Googlebot"? I think checking ip range is more trustworthy!
– Mojtaba Rezaeian
Jul 1 '15 at 6:39
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Difference between TCP and UDP?
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TCP is a connection oriented stream over an IP network. It guarantees that all sent packets will reach the destination in the correct order. This imply the use of acknowledgement packets sent back to the sender, and automatic retransmission, causing additional delays a...
How to create a self-signed certificate with OpenSSL
...lopment.
# DNS.5 = localhost
# DNS.6 = localhost.localdomain
# IP.1 = 127.0.0.1
# IP.2 = ::1
It's important to put DNS name in the SAN and not the CN, because both the IETF and the CA/Browser Forums specify the practice. They also specify that DNS names in the CN are depr...