None, they communicate to the layer 7, however they do not operate at that layer(application)
Layer 7, Aplication
IP operates at layer 3, this is the NETWORK LAYER in the OSI Model. Network+ Guide to Networks Fifth Edition Ch02, pg56, Figure 2-7
TCP operates at Layer 4 which is Transport of the OSI Model!
TELNET operates at Application Layer in TCP/IP Model. It's an Application to establish a connection to TCP Port Number 23, where a Telnet server application (telnetd) is listening.
Content switches
DNS is an application layer protocol. The application layer of the OSI model is the layer closest to the user and provides network services to the applications of the user. Examples of protocols that operate at the application layer are: DNS, FTP, TFTP, SNMP, TELNET, RLOGIN, SMTP, MIME, NFS, FINGER, BOOTP and SMB.
The tectonic plates which form Earth's crust move on top of the outer layer of the mantle. This layer of the mantle is known as the asthenosphere.
It's called the OSI Model... it has 7 layers. 1) Physical Layer 2) Data Link Layer 3) Network Layer 4) Transport Layer 5) Session Layer 6) Presentation Layer 7) Application Layer
instruction how to get multiples of number 7 to 20
Layer 7: The Application Layer
Layer 3,4 and 7