This article is part of the following series. 6 performance tools you should know in Linux 5 Ways to Check disk size in Linux 4 Ways to Check Disk Partition with Examples in Linux How I Fixed a disk performance issue in Minutes – A Step by Step Guide to Optimize Linux System To …
Linux
An SPF (Sender Policy Framework) record is a type of TXT record in our DNS zone file. SPF records help identify which mail servers are permitted to send email on behalf of our domain. Adding an SPF record can help detect and prevent spammers from sending email messages with forged From addresses on our domain. …
DNS PRT record is short for pointer record. It is one of the common Domain Name System (DNS) records. It resolves an IP address to a domain or hostname. It is also called DNS reverse record. The following commands can be used to check PTR record in Linux. dig -x 8.8.8.8 nslookup 8.8.8.8 What …
DNS MX record is short for mail exchange. It is used to direct email to a mail server. The MX record indicates how email messages should be routed when we send out an email. The best way is to check dns MX record in Linux is using the dig command. For example: dig domain.com mx …
A port is a virtual numbered address that’s used as a communication endpoint by transport layer protocols like UDP (user diagram protocol) or TCP (transmission control protocol). Network ports direct traffic to the right places — i.e., they help the devices involved identify which service is being requested. For instance, the port that’s responsible for …
An SSL certificate helps to secure the communication between a client (such as a web browser) and a server (such as a website). If the certificate has expired, it can no longer be trusted to secure this communication, and an attacker may be able to intercept and view sensitive information being transmitted between the client …
An SSL cipher, or an SSL cipher suite, is a set of algorithms or a set of instructions/steps that helps to establish a secure connection between two entities. SSL cipher suites determine the method through which a secure connection will take place between both entities. This communication could be taking place through HTTPS, FTPS, SMTP, …
SSL (Secure Sockets Layer) connection is a connection that provides secure communications on the Internet for such things as web browsing, e-mail, instant messaging, and other data transfers. Although SSL was replaced by an updated protocol called TLS (Transport Layer Security) some time ago, “SSL” is still a commonly used term for this technology. How …
An SSL/TLS certificate is a file installed on a website’s origin server. It’s simply a data file containing the public key and the identity of the website owner, along with other information. Without a server certificate, a website’s traffic can’t be encrypted with TLS. SSL/TLS certificates are the most popular type of X.509 certificate. SSL/TLS …
We have two methods to use update-ca-trust or trust anchor to add a CA certificate on Linux. We need to install the ca-certificates package first with the command yum install ca-certificates. Understanding Root CA certificate SSL certificates operate on a structure called the certificate chain — a network of certificates starting back at the issuing …