1/12
Looks like no tags are added yet.
Name | Mastery | Learn | Test | Matching | Spaced |
---|
No study sessions yet.
Resource Records (RR)
◦These are the database records of the domain name services.
◦There are over 30 record types, including IP addresses, certificates, and host alias names.
◦These configurations are critical and require careful checking, backing up, and testing.
A Records (Address Records)
◦Defines the IPv4 address of a host.
◦This is the most popular query type for DNS.
◦Modifying an A record changes the hostname to IP address resolution.
AAAA Records
◦Defines the IPv6 address of a host.
◦Managed by the same DNS server as A records, but are distinct record types.
CNAME Records (Canonical Name Records)
◦Establishes a name as an alias of another, canonical name.
◦Allows one physical server to host multiple services.
MX Records (Mail Exchanger Record)
◦Determines the host name for the mail server.
◦Note that an MX record is a name, not an IP address.
TXT Records (Text Records)
◦Contains human-readable text information, originally for informal public information.
◦Can be used for verification purposes (e.g., proving domain administration).
◦Commonly used for email security, where external email servers validate information from your DNS.
DKIM (Domain Keys Identified Mail)
◦Used to digitally sign a domain's outgoing mail.
◦Validated by mail servers (not usually seen by end-users), with the public key located in the DKIM TXT record.
SPF (Sender Policy Framework)
◦An SPF protocol defines a list of all servers authorized to send emails for a specific domain.
◦Helps prevent mail spoofing by allowing mail servers to check if incoming mail came from an authorized host.
DMARC (Domain-based Message Authentication, Reporting, and Conformance)
◦An extension of SPF and DKIM that helps prevent unauthorized email use (spoofing).
◦Allows you to define a policy in a DMARC TXT record for how external email servers should handle emails that don't validate through SPF or DKIM (e.g., accept, send to spam, or reject).
◦Can also send compliance reports to the email administrator.
DHCP Leases (DORA Process)
◦The four-step process a client uses to obtain an IP address from a DHCP server:
▪Discover: The client finds a DHCP server.
▪Offer: The server offers an IP address to the client.
▪Request: The client requests to lock in the offer.
▪Acknowledge: The DHCP server confirms the IP assignment.
DHCP Scopes
◦Configured on the DHCP server to define the range of IP addresses (and excluded addresses) that can be assigned.
◦Also includes the subnet mask, lease durations, and other options like DNS server and default gateway.
DHCP Pools
◦A grouping of IP addresses, with each subnet typically having its own scope.
◦A scope is generally a single contiguous pool of IP addresses, though exclusions can be made within it.
Address Reservation
◦An administratively configured method to assign a specific IP address to a particular MAC address within the DHCP server.
◦Also known as Static DHCP Assignment, Static DHCP, or IP Reservation.