11 July 2016 RE Meyers, Ms.Ed., CCAI CCNA Discovery Curriculum Review Networking for Home and Small Businesses Chapter 6: Network Services

11 July 2016 RE Meyers, Ms.Ed., CCAI Disclaimer  This review is not a comprehensive learning model of the curriculum!  It is intended for chapter pre-exam prep, or post exam review.  Using this presentation as your sole source of teaching or learning will not provide all the information you need to be successful in the Cisco Networking Academy.  All materials, images, text, and content unless noted remains the licensed property of the Cisco Networking Academy.  Please report all errors as soon as possible to:

11 July 2016 RE Meyers, Ms.Ed., CCAI Objectives  Compare and contrast clients and servers and their interaction over the network.  Describe the type of interactions of Internet applications.  Describe the purpose of a layered model  Illustrate the interaction of various protocols.

11 July 2016 RE Meyers, Ms.Ed., CCAI ICG: Section 6.1

11 July 2016 RE Meyers, Ms.Ed., CCAI Clients/Servers and Their Interactions  A server is a host running software that provides information or services to other hosts on the network.

11 July 2016 RE Meyers, Ms.Ed., CCAI Clients/Servers and Their Interactions  DHCP is likely the first used by a host re-booting.

11 July 2016 RE Meyers, Ms.Ed., CCAI Clients/Servers and Their Interactions  Clients and servers use specific protocols to communicate

11 July 2016 RE Meyers, Ms.Ed., CCAI Clients/Servers and Their Interactions  TCP is used when an application requires acknowledgment that a message is delivered  FTP and HTTP

11 July 2016 RE Meyers, Ms.Ed., CCAI Clients/Servers and Their Interactions  UDP is a 'best effort' delivery and does not require acknowledgment of receipt  Used with streaming audio, video, gaming, and VoIP

11 July 2016 RE Meyers, Ms.Ed., CCAI Port Numbers in Client-Server Conversations  TCP and UDP use port numbers to identify protocols and services

11 July 2016 RE Meyers, Ms.Ed., CCAI ICG: Section 6.2

11 July 2016 RE Meyers, Ms.Ed., CCAI Applications Protocols and Services  Domain Name System (DNS) translates domain names into IP addresses

11 July 2016 RE Meyers, Ms.Ed., CCAI Applications Protocols and Services 6.2.1

11 July 2016 RE Meyers, Ms.Ed., CCAI Applications Protocols and Services  FTP Protocol  Requests via port 21  Replies via port 20

11 July 2016 RE Meyers, Ms.Ed., CCAI Applications Protocols and Services 6.2.4

11 July 2016 RE Meyers, Ms.Ed., CCAI Applications Protocols and Services  Instant Messaging for real time communication

11 July 2016 RE Meyers, Ms.Ed., CCAI Applications Protocols and Services  Client requests can be identified by a server by the specific destination port.

11 July 2016 RE Meyers, Ms.Ed., CCAI ICG: Section 6.3

11 July 2016 RE Meyers, Ms.Ed., CCAI Layered Model and Protocols 6.31  TCP protocol stack formats, addresses, and transmits information across a network

11 July 2016 RE Meyers, Ms.Ed., CCAI Layered Model and Protocols  When sending messages on a network, the protocol stack on a host operates from top to bottom

11 July 2016 RE Meyers, Ms.Ed., CCAI Layered Model and Protocols ip source and destination

11 July 2016 RE Meyers, Ms.Ed., CCAI Layered Model and Protocols 6.3.2

11 July 2016 RE Meyers, Ms.Ed., CCAI Layered Model and Protocols

11 July 2016 RE Meyers, Ms.Ed., CCAI Layered Model and Protocols  Open Systems Interconnect Model

11 July 2016 RE Meyers, Ms.Ed., CCAI Layered Model and Protocols 6.3.3

11 July 2016 RE Meyers, Ms.Ed., CCAI Layer

11 July 2016 RE Meyers, Ms.Ed., CCAI Summary  Clients and servers use protocols and standards for exchanging information.  Client-server services are identified through the use of port numbers.  A protocol stack organizes the protocols in layers, with each layer providing and receiving services from the layers below and above it.  When sending messages, protocols interact from the top layer to the bottom of the stack.  When receiving messages, protocols interact from the bottom layer to the top of the stack.

11 July 2016 RE Meyers, Ms.Ed., CCAI