개요
주요 기능
transport layer의 class
| Function | Class 0 | Class 1 | Class 2 | Class 3 | Class 4 |
|---|---|---|---|---|---|
| multiplexing | ✔ | ✔ | ✔ | ||
| recovery from signaled errors | ✔ | ✔ | ✔ | ||
| recovery from residual errors | ✔ | ||||
| connectionless network | ✔ |
| OSI Model | |||
|---|---|---|---|
| Layer | Protocol Data Unit(PDU) | Function | Examples |
| 7.Application | Data | High-level APIs including resource sharing, remote file access, directory services and virtual terminals | RTP? |
| 6.Presentation | Translation of data between a networking service and an application, including character encoding, data compression and encryption/decryption | CSS, GIF, HTML, XML, JSON | |
| 5.Session | Managing communication sessions, i.e. continuous exchange of information in the form of multiple back-and-forth transmissions between two nodes | RPC, TLS, FTP, HTTP, HTTPS, SMTP, SSH, Telnet | |
| 4.Transport | Segment/Datagram | Reliable transmission of data segments between points on a network, including segmentation, acknowledgement and multiplexing | TCP, UDP |
| 3.Network | Packet | Structuring and managing a multi-node network, including addressing, routing and traffic control | ICMP, IPsec, IPv4, IPv6 |
| 2.Data Link | Frame | Reliable transmission of data frames between two nodes connected by a physical layer | IEEE 802.2, MAC, PPP |
| 1.Physical | Bit | Transmission and reception of raw bit streams over a physical medium | DOCSIS, Ethernet physical layer, ISDN, RS-232 |
Discrete-Time Fourier Transform (DTFT)
Discrete Fourier Transform (DFT)
