DNS…
TXT record aka text record. Text records are used within DNS for various purposes and they can contain just about any kind of information.
SPF (Sender Policy Framework) records. This record pertains to the delivery of emails while an MX record identifies which servers email should flow toward, an SPF record identifies which locations email is coming from.
Name Server (NS) record: An NS record is an identifier within a DNS zone that tells it which name servers to use as the authorities for that zone.
Public name server records, NS records are critical to understanding when working with public/internet DNS records. We discover that Name Server record for the domain was pointing at a different sever or service altogether.
Whenever a company configures their internal DNS to match their external DNS, this is commonly referred to as split-brain DNS.
Types of DNS Zones
1. Active Directory Integrated Zones
2. Forward Lookup Zones
3. Reverse Lookup Zones
4. Primary Zone
5. Secondary Zone
6. Stub Zone
IP addressing with DHCP
IP addresses on your network are sort of like home addresses on your street. When you want to send a package to someone, you write their address on the front of the package and set it in the mailbox. In the same way, when your computer wants to send data to a server or another device on a network, each of those devices has an IP address that is used for the delivery of those packets.
We know that DNS is responsible for telling the machines which name resolves to which IP address but how do those IP addresses get put into place on the servers and computers in the first place?
Static addressing is simply the process of configuring IP addresses on your system manually, using your own hands as the configuration tool to plug all your IP address information into the NIC settings on that device.
Even in a small company with 10 employees, each person may have a desktop and a laptop, there are likely going to be printers on the network also needing IP addresses and you may have a wireless network where employees or even guests can connect phones and other devices in order to gain internet access. Are you going to assign IP addresses by hand to all of these devices? Certainly not.
Our answer to this problem is the Dynamic Host Configuration Protocol (DHCP). This is a protocol that is designed to solve our exact problem by providing the ability for machines and devices to be plugged into your network and automatically obtain IP addressing information.
to be continued…