Network
7
Application Layer
Application Layer
HTTP, HTTPS, FTP, POP3, SMTP, IMAP, Telnet, SSH,
Providing services and interfaces to applications
6
Presentation Layer
Unicode, MIME, JPEG, PNG, MPEG
Data encoding, encryption, and compression
5
Session Layer
NFS, RPC
Establishing, maintaining, and synchronising sessions
4
Transport Layer
Transport Layer
TCP, UDP
End-to-end communication and data segmentation
3
Network Layer
Internet Layer
IP, ICMP, IPSec
Logical addressing and routing between networks
2
Data Link Layer
Link Layer
Ethernet 802.3, WiFi 802.11
Reliable data transfer between adjacent nodes
1
Physical Layer
Electrical, optical, and wireless signals
Physical data transmission media
DNS record type
DNS Record
Description
A Record
Holds the IPv4 address of a domain.
AAAA Record
Contains the IPv6 address of a domain.
CNAME Record
Forwards one domain or subdomain to another domain but does not provide an IP address.
MX Record
Directs email to an email server.
TXT Record
Allows admins to store text notes in the record, often used for email security.
NS Record
Stores the name server for a DNS entry.
SOA Record
Stores administrative information about a domain.
SRV Record
Specifies a port for specific services.
PTR Record
Provides a domain name in reverse DNS lookups.
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