Network basic exam interview questions study notes

• OSI reference model:

	Hierarchical name	Function	protocol
7	application layer	Provides services to applications and specifies details related to communication within the application. Including file transfer, email, etc.	HTTP、DNS、FTP
6	presentation layer	Translate, encrypt, compress data	JPEG、MPEG
5	session layer	Responsible for the establishment and disconnection of communication connections, and the management of data transmission such as data segmentation	NFS、SQL
4	transport layer	Manage data transfer between two nodes. Responsible for reliable transmission	TCP、UDP
3	Network layer	Address management and routing to transfer data to destination addresses	IP、ARP
2	data link layer	Responsible for the communication between nodes that are interconnected at the physical level	PPP、VLAN、MAC
1	physical layer	Transmission of bits, bit streams, and switching between electronic signals through a medium	IEEE802.3, repeater, hub

• TCP/IP and OSI Reference Model

application layer	application layer	application
presentation layer	application layer	application
session layer	application layer	application
transport layer	Transport layer TCP, UDP, DCCP	operating system
Network layer	Internet layer ARP, IP, ICMP	operating system
link layer	NIC layer	Device Drivers and Network Interfaces
physical layer	Physical layer (hardware)	Device Drivers and Network Interfaces
OSI Reference Model	TCP/IP Layered Model