Layers and Protocols

Seite 1

Protocols:

1) TCIP/IP

- TCP: Prepares messages for transmission and reassembles any received messages

- IP: Responsible for providing the destination address and recognising incoming packets

2) HTTP/HTTPS

- Client-server method of loading web pages

- (HTTPS) Encrypted version of HTTP

+ http(s):// is using this protocol

3) FTP

- Transfers files between a client and a server

+ Transfer: upload and download

4) POP

- Email client use to get/delete/download email from emails server

+ Only handles one mailbox

+ Once downloaded, emails are removed from the emails server and cannot be revisited

5) IMAP

- Email clients use to get/delete emails from server and manage emails on the server (a better POP)

+ Set flags on emails for read, replied to, or deleted etc.

+ Access emails on multiple devices

6) SMTP

- The Email server use to send and receive emails from other mail servers

Seite 2

Concept of Layering:

- Developed to show how layers interact:

- Simplifies how the complex system of networking

+ Layers can only interact with the layer below or above them

+ Devices can be manufactured to operate on a particular layer

+ Products from different vendors will work together

o APPS TEND TO POP

o ATI(ND))

Seven Layer:

AP(p)S T(e)ND (to) P(op)

APPLICATION

PRESENTATION

SESSION

TRANSPORT

NETWORK

DATA LINK

PHYSICAL

Four Layer:

AT I(N/D)

APPLICATION

TRANSPORT

INTERNET

NETWORK/DATA LINK