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Chapter 3: Network Protocols and Communicationscnacad.com/Assets/CCNA1 Exploration/Week 2/Chapter 3...
Transcript of Chapter 3: Network Protocols and Communicationscnacad.com/Assets/CCNA1 Exploration/Week 2/Chapter 3...
© 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Presentation_ID 1
Chapter 3: Network Protocols and Communications
Introduction to Networks
Presentation_ID 2 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Chapter 3 3.1 Rules of Communication 3.2 Network Protocols and Standards 3.3 Moving Data in the Network 3.4 Summary
Presentation_ID 3 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Chapter 3: Objectives
Students will be able to:
Explain how rules are used to facilitate communication.
Explain the role of protocols and standards organizations in facilitating interoperability in network communications.
Explain how devices on a LAN access resources in a small to medium-sized business network.
3.0.1.1
Presentation_ID 4 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Network Protocols and Standards Standards Organizations
3.0.1.2
Presentation_ID 5 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
The Rules What is Communication?
3.1.1.1
Do animations on buttons on
3.1.1.1
Presentation_ID 6 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
The Rules Establishing the Rules Establishing the Rules
An identified sender and receiver
Agreed upon method of communicating (face-to-face, telephone, letter, photograph)
Common language and grammar
Speed and timing of delivery
Confirmation or acknowledgement requirements
3.1.1.2
Do buttons on 3.1.1.2
Presentation_ID 7 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
The Rules Message Encoding
3.1.1.3
Do animations on buttons on
3.1.1.3
Presentation_ID 8 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
The Rules Message Formatting and Encapsulation Example: Personal letter contains the following elements:
An identifier of the recipient
A salutation or greeting
The message content
A closing phrase
An identifier of the sender
3.1.1.4
Do animations on buttons on
3.1.1.4
Presentation_ID 9 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
The Rules Message Size The size restrictions of frames require the source host to break a long message into individual pieces that meet both the minimum and maximum size requirements.
This is known as segmenting.
Each segment is encapsulated in a separate frame with the address information, and is sent over the network.
At the receiving host, the messages are de-encapsulated and put back together to be processed and interpreted.
3.1.1.5
Do animations on buttons on
3.1.1.5
Presentation_ID 10 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
The Rules Message Timing Access Method
Flow Control
Response Timeout
3.1.1.6
Do buttons on 3.1.1.6
Presentation_ID 11 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
The Rules Message Delivery Options
3.1.1.7
Do animations on buttons on
3.1.1.7
Presentation_ID 12 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Protocols Rules that Govern Communications
3.2.1.1
Presentation_ID 13 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Protocols Network Protocols How the message is formatted or structured
The process by which networking devices share information about pathways with other networks
How and when error and system messages are passed between devices
The setup and termination of data transfer sessions
3.2.1.3
Know the protocols on
3.2.1.3
Presentation_ID 14 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Protocols Interaction of Protocols Application Protocol – Hypertext Transfer Protocol (HTTP)
Transport Protocol – Transmission Control Protocol (TCP)
Internet Protocol – Internet Protocol (IP)
Network Access Protocols – Data Link & Physical layers
3.2.2.1
Presentation_ID 15 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Protocol Suites Protocol Suites and Industry Standards
3.2.2.1
Presentation_ID 16 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Protocol Suites Creation of Internet, Development of TCP/IP
3.2.2.2
Do buttons on 3.2.2.2
Presentation_ID 17 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Protocol Suites TCP/IP Protocol Suite and Communication
3.2.2.3 Do buttons and animations
on 3.2.2.3
Presentation_ID 18 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Protocol Suites TCP/IP Protocol Suite and Communication
3.2.2.4 Do Drag and drop activity
on 3.2.2.4
Presentation_ID 19 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Standards Organizations Open Standards The Internet Society (ISOC) The Internet Architecture Board (IAB) The Internet Engineering Task Force (IETF) Institute of Electrical and Electronics Engineers
(IEEE) The International Organization for Standards (ISO)
3.2.3.1
Presentation_ID 20 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Standards Organizations ISOC, IAB, and IETF
3.2.3.2
Presentation_ID 21 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Standards Organizations IEEE 38 societies
130 journals
1,300 conferences each year
1,300 standards and projects
400,000 members
160 countries
IEEE 802.3
IEEE 802.11
3.2.3.3
Presentation_ID 22 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Standards Organizations IEEE
3.2.3.3
Important: 802.3 – Ethernet 802.11 - Wireless
Presentation_ID 23 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Standards Organizations ISO
3.2.3.4
Important: This model is our basis
for discussing networking!
Presentation_ID 24 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
OSI in a Nutshell Layer Keyword(s) Device Protocol
Data Unit TCP/IP Utilities
7 Application Web Browser Computer Data FTP, TFTP
6 Presentation common data format Data
5 Session dialing the phone Data
4 Transport Flow Control
Reliability Sequencing
Segments
3 Network Routing
Path Selection Logical Addressing
Router Packets Ping
Trace Route
2 Data Link Frames Media Access Control (MAC)
Bridge Switch NIC
Frames ARP
1 Physical Hardware
Electricity Light Radio Waves
Transceiver Repeater
Hub Bits
Know All These!
3.2.3.4 Class Activity – hands on OSI model drag and drop
Presentation_ID 25 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Standards Organizations Other Standards Organization The Electronic Industries Alliance (EIA)
The Telecommunications Industry Association (TIA)
The International Telecommunications Union – Telecommunications Standardization Sector (ITU-T)
The Internet Corporation for Assigned Names and Numbers (ICANN)
The Internet Assigned Numbers Authority (IANA)
3.2.3.5
Presentation_ID 26 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Standards Organizations Activity - Standards Body Scavenger Hunt
3.2.3.7
Do activity 3.2.3.7 in class
Presentation_ID 27 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Reference Models The Benefits of Using a Layered Model
3.2.4.1
Presentation_ID 28 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Reference Models The Benefits of Using a Layered Model
3.2.4.1
Be able to match OSI layers to
TCP/IP model layers
Presentation_ID 29 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Reference Models The OSI Reference Model
3.2.4.2
Click on buttons 3.2.4.2
Presentation_ID 30 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Reference Models The TCP/IP Reference Model
3.2.4.3
Presentation_ID 31 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Reference Models Comparing the OSI and TCP/IP Models
3.2.4.4
Be able to match
OSI layers to TCP/IP model layers
Presentation_ID 32 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Reference Models Activity – Identify Layers and Functions
3.2.4.5
Do the activates on both buttons
on 3.2.4.5
Presentation_ID 33 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Reference Models Packet Tracer - Investigating the TCP/IP and OSI Models in Action
3.2.4.6
Do lab 3.2.4.6 For a grade
Presentation_ID 34 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Data Encapsulation Communicating the Messages Segmenting message benefits
Different conversations can be interleaved
Increased reliability of network communications
Segmenting message disadvantage Increased level of complexity
3.3.1.1
Do buttons and
animations on 3.3.1.1
Presentation_ID 35 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Data Encapsulation Protocol Data Units (PDUs) Data
Segment
Packet
Frame
Bits
3.3.1.2
Know PDU for each
layer!
Presentation_ID 36 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Data Encapsulation Encapsulation
3.3.1.3
Do animation on 3.3.1.3
Presentation_ID 37 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Data Encapsulation De-encapsulation
3.3.1.4
Do animation on 3.3.1.4
Presentation_ID 38 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Data Encapsulation Activity – Identify the PDU Layer
3.3.1.5
Do Drag and Drop on 3.3.1.5 In class
Presentation_ID 39 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Moving Data in the Network Accessing Local Resources
3.3.2.1
Presentation_ID 40 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Accessing Local Resources Network Addresses & Data Link addresses Network Address
Source IP address Destination IP address
Data Link Address Source data link address Destination data link address
3.3.2.1
Presentation_ID 41 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Accessing Local Resources Communicating with Device / Same Network
3.3.2.2
Presentation_ID 42 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Accessing Local Resources MAC and IP Addresses
PC1 192.168.1.110
AA-AA-AA-AA-AA-AA
PC2 192.168.1.111
BB-BB-BB-BB-BB-BB
FTP Server 192.168.1.9
CC-CC-CC-CC-CC-CC
R1 192.168.1.1
11-11-11-11-11-11 ARP
Request S1 R1
3.3.2.3
Understand ARP
protocol!
Do animation on 3.3.2.3
Presentation_ID 43 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Accessing Remote Resources Default Gateway
3.3.3.1
Key concept: Default
Gateway
Presentation_ID 44 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Accessing Remote Resources Communicating Device / Remote Network
3.3.3.2
Presentation_ID 45 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Accessing Remote Resources Packet Tracer - Explore a Network
3.3.3.3 – 3.3.3.4
Do this one?
Wire shark lab 3.3.3.4
Extra credit?
Presentation_ID 46 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Accessing Remote Resources Using Wireshark to View Network Traffic
3.3.3.4
Presentation_ID 47 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Network Protocols and Communications Summary In this chapter, you learned:
Data networks are systems of end devices, intermediary devices, and the media connecting the devices. For communication to occur, these devices must know how to communicate.
These devices must comply with communication rules and protocols. TCP/IP is an example of a protocol suite.
Most protocols are created by a standards organization such as the IETF or IEEE.
The most widely-used networking models are the OSI and TCP/IP models.
3.4.1.1 – 3.4.1.2
Presentation_ID 48 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Network Protocols and Communications Summary In this chapter, you learned:
Data that passes down the stack of the OSI model is segmented into pieces and encapsulated with addresses and other labels. The process is reversed as the pieces are de-encapsulated and passed up the destination protocol stack.
The OSI model describes the processes of encoding, formatting, segmenting, and encapsulating data for transmission over the network.
The TCP/IP protocol suite is an open standard protocol that has been endorsed by the networking industry and ratified, or approved, by a standards organization.
3.4.1.1 – 3.4.1.2
Presentation_ID 49 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential
Network Protocols and Communications Summary In this chapter, you learned:
The Internet Protocol Suite is a suite of protocols required for transmitting and receiving information using the Internet.
Protocol Data Units (PDUs) are named according to the protocols of the TCP/IP suite: data, segment, packet, frame, and bits.
Applying models allows individuals, companies, and trade associations to analyze current networks and plan the networks of the future.
3.4.1.1 – 3.4.1.2
Presentation_ID 50 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential