Application Layer

Question 0

Ex of application layer protocols

Answer 0

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

Question 1

Main purpose

Answer 1

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

Question 2

Steps of application layer

Answer 2

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

Question 3

Side note:

Answer 3

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

Question 4

Server

Answer 4

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

Question 5

Client

Answer 5

Requests something from server

Question 6

Upload

Answer 6

Data from client to server

Question 7

Download

Answer 7

Data from server to client

Question 8

P2p network

Answer 8

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

Question 9

DNS

Answer 9

Matches resource names with ip addresses.

Question 10

Ipconfig/displaydns

Answer 10

Displays all cached DNS entries

Question 11

DNS hierarchy

Answer 11

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

Question 12

HTTP, HTTPS

Answer 12

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

Question 13

Get message (HTTP)

Answer 13

Request for data

Question 14

Put message (HTTP)

Answer 14

Uploads resources or content to the web server

Question 15

Post message (HTTP)

Answer 15

Includes data in messages sent to server

Question 16

DNS Process

Answer 16

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

Question 17

MTA

Answer 17

Forwards email to destination

Question 18

MDA

Answer 18

Place in appropriate mailbox; final delivery of email

Question 19

FTP requires two connections:

Answer 19

One for commands and replies via port 21

The other for actual file transfer via port 20

Question 20

Gnutella protocol

Answer 20

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

Question 21

DHCP

Answer 21

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

Question 22

SMB

Answer 22

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

Question 23

Telnet

Answer 23

Remote access to a device