Protocols for each layer of the OSI model

OSI 7-layer models corresponding to each layer of the OSI model OSI reference model data encapsulation process OSI reference model VS TCP/IP Reference Model TCP/IP layer corresponding to each layer of the protocol TCP/IP Layer the corresponding TCP/IP protocol is applied to the Application layer of hardware devices at each layer): application gateway Telnet: Remote Logon (connecting two applications at the application layer) FTP (File Transfer Protocol): File Transfer Protocol HTTP (Hyper Text Transfer Protocol ): hypertext Transfer Protocol SMTP (Simple Mail Transter Protocol): Simple Mail transmission Protocol POP3 (Post Office Ptotocol): Post Office Protocol SNMP (Simple Network Mangement Protocol): Simple Network Management Protocol DNS (Domain Name System): Transport: transport gateway TCP (Transmission Control Potocol): Transmission Control Protocol (connecting two networks at the Transport layer) UDP (User Data Potocol): User Data Protocol network layer (Internet): multi-Protocol router (multiprotocol router) IP (Internet Protocol): network Protocol (forwarding groups between heterogeneous networks) ARP (Address Resolution Protocol): Address Resolution Protocol RARP (Reverse Address Resolution Protocol): Reverse Address Resolution Protocol ICMP (Internet Control Message Protocol): Internet Control Message Protocol IGMP (Internet Group Manage Protocol ): Internet Group Management Protocol BOOTP (Bootstrap): optional security start Protocol Data Link: bridge switch (switcher) HDLC (High Data Link Control ): advanced Data Link Control (storing data between LANs-forwarding data link pins) SLIP (Serial Line IP): Serial Line IP (Point-to-Point Protocol ): point-to-Point Protocol 802.2 and other Physical layers (Physical): repeater hubs do not have (Amplified or regenerated weak signals, copying each bit between two cable segments) the application layer includes all protocols that work collaboratively with applications and exchange application-specific data using the basic network. For example, HTTP (Hypertext Transfer Protocol) and Hypertext Transfer Protocol. PORT 80 TELNET (Teletype over the Network, Network telex), through a terminal (terminal) login to the Network (running on the TCP Protocol) PORT 23 FTP (File Transfer Protocol, file Transfer Protocol (TCP ). PORT 20/21 SMTP (Simple Mail Transfer Protocol, Simple Mail Transfer Protocol), used to send emails (running on TCP Protocol ). DNS (Domain Name Service) is used for address search and Email Forwarding (running on TCP and UDP protocols ). PORT 53 SNMP (Simple Network Management Protocol) is used to collect Network information and manage networks. PORT 161 transport layer this layer provides end-to-end communication. The most important transport layer protocol is the transport control protocol TCP. Transmission Control Protocol (TCP)-data stream transmission (connection-oriented and reliable) User data packet Protocol (UDP)-data packet transmission (non-connection and unreliable) the network layer is responsible for data forwarding and routing. From the above layer, we can think that there is an unreliable and connectionless end-to-end data path. The Core Protocol is, of course, the IP protocol. In addition, there are also ICMP, RIP, OSPF, IS-IS, BGP, ARP, RARP, and so on.