When we use the Ping command, we usually pay attention to the value of time = MS, but ignore the value of TTL. When TTL is different from Ping, the value of TTL is different. What is the reason?What is the use of TTL?What is
TTL is the abbreviation of Time To Live in English, meaning "survival time value". In short, it means the time of DNS record cache on DNS server.It is assumed that there is such a domain name myhost.Symbolics.com (in fact, this is a DNS record, usually expressed in Symbolics.c...
When you surf the Internet, do you occasionally encounter a series of situations, such as unable to open the website, or particularly slow and slow?This may be the problem of the local DNS parsing service, and change them to solve the problem.What is the use of DNS?
DNS (Domain Name System, domain name system), the world wide web as a distributed database mapping domain names and IP addresses, enables users to access the Internet more conveniently without having to memorize IP numbers that can be read directly by machines.Through the domain name, the IP address of the domain name is finally obtained.
What should people do when they are confused?There are two things to do.The first step is to shrink.Stop all the things that are not necessary to do, take time and energy back, rather let go, and don't muddle through the unexamined learning.Confusion is not nothing to do, but what we do is meaningless.It's meaningless to stop.It takes time to allow physical and mental recovery to normal.Confusion will make you anxious, let you sleep late, let you eat more, so that you can't wait to fill every inch of spare time, let your body and soul tired, let you not satisfied with yourself, make you more anxious,...
Shodan and ZoomEye, the two foreign search engines in the latter part of the country, which are different from the search engines of Baibu Google, can be used to search for online devices in the network space. You can search specific devices through them, or search for specific types of devices. The most popular search contents are webcam, Linksys, Cisco, Netgear, SCADA and so on.It's like using Google to input what you want to search in the search box of the home page, for example, search for "SSH".