ITN MODULE 15

note to author: stopped at 15.2

application

In the OSI and the TCP/IP models, the ________ layer is the closest layer to the end user

programs

Application layer protocols are used to exchange data between _____ running on the source and destination hosts.

formatting

The presentation layer has three primary functions:

• ________, or presenting, data at the source device into a compatible format for receipt by the destination device.

compressing

The presentation layer has three primary functions:

• ______ data in a way that can be decompressed by the destination device.

session layer

handles the exchange of information to initiate dialogs, keep them active, and to restart sessions that are disrupted or idle for a long period of time.

TCP/IP application protocols

The ___________ specify the format and control information necessary for many common internet communication functions.

Name System

what protocol is this

• TCP, UDP 53

• Translates domain names, such as cisco.com, into IP addresses.

Host Config

what protocol is this

deals with BOOTP and DHCP

Bootstrap Protocol

• UDP client 68, server 67

• Enables a diskless workstation to discover its own IP address, the IP address of a BOOTP server on the network, and a file to be loaded into memory to boot the machine

• BOOTP is being superseded by DHCP

Dynamic Host Configuration Protocol

• UDP client 68, server 67

• Dynamically assigns IP addresses to be re-used when no longer needed

Email

what protocol deals with

SMTP, POP3, IMAP

Simple Mail Transfer Protocol

• TCP 25

• Enables clients to send email to a mail server

• Enables servers to send email to other servers

Post Office Protocol

• TCP 110

• Enables clients to retrieve email from a mail server

• Downloads the email to the local mail application of the client

Internet Message Access Protocol

• TCP 143

• Enables clients to access email stored on a mail server

• Maintains email on the server

File Transfer Protocol

• TCP 20 to 21

• Sets rules that enable a user on one host to access and transfer files to and from another host over a network

• FTP is a reliable, connection-oriented, and acknowledged file delivery protocol

Trivial File Transfer Protocol

• UDP client 69

• A simple, connectionless file transfer protocol with best-effort, unacknowledged file delivery

• It uses less overhead than FTP

Hypertext Transfer Protocol

• TCP 80, 8080

• A set of rules for exchanging text, graphic images, sound, video, and other multimedia files on the World Wide Web

HTTP Secure

• TCP, UDP 443

• The browser uses encryption to secure HTTP communications

• Authenticates the website to which you are connecting your browser

1

This layer of the OSI model is concerned with the protocols that exchange data between programs running on hosts.

1) Application

2) Transport

3) Network

4) Physical

2

MKV, GIF, and JPG standards are associated with which OSI layer?

1) Application

2) Presentation

3) Session

4) Transport

DNS, SMTP

Which two are protocols that belong in the OSI application layer?

• PNG

• DNS

• SMTP

• QuickTime

4

This is a function of the OSI session layer.

1) Compress and decompress data x

2) Provide an interface between applications

3) Format data for the application layer

4) Exchange of information to initiate dialog between peers