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Flashcards in Application Layer Deck (24):
0

Main purpose

Provides network services to users applications; exchange data between source and destination hosts

1

Ex of application layer protocols

Http, FTP, email, smtp, pop, telnet, ssh

2

Steps of application layer

1. Create
2. Prepare
3. Convert
4. Initiate transfer
5. Roles of each layer

3

Side note:

Provides interface between apps we use to communicate and the bottom layers of osi model

4

Server

Runs a daemon or process in the background, not under users control; resources usually stored on server

5

Client

Requests something from server

6

Upload

Data from client to server

7

Download

Data from server to client

8

P2p network

2 more pcs via a network sharing resources without a dedicated server; central admin not required; either device can function as server or client at a time

9

DNS

Matches resource names with ip addresses.

10

Ipconfig/displaydns

Displays all cached DNS entries

11

DNS hierarchy

cisco.netacad.com
.com is a top level
.netacad is a second level domain
Cisco is at the lower level

12

HTTP, HTTPS

Control transfers of web resources from a web server to a client browser

13

Get message (HTTP)

Request for data

14

Put message (HTTP)

Uploads resources or content to the web server

15

Post message (HTTP)

Includes data in messages sent to server

16

DNS Process

1. Request page
2. Http server returns code
3. Client web browser interprets code

17

MTA

Forwards email to destination

18

MDA

Place in appropriate mailbox; final delivery of email

19

FTP requires two connections:

One for commands and replies via port 21

The other for actual file transfer via port 20

20

Gnutella protocol

Each device on network tell the other what files are avail when queried

21

DHCP

Automatically configures IP address, temporarily leases subnet masks, gateway, other ip parameters

22

SMB

Client-server file-sharing protocol developed by Microsoft; long term connections to servers; described structure of shared network resources such as printer, directories

23

Telnet

Remote access to a device