Introduction to Technology Infrastructure Chapter 1

Announcements and Outline Syllabus Questions White Hat Agreement Class Outline 1.Introduction to Networks 1.1Network Types/Technologies 1.2Layering and Packetization 2

1.1 Network Types/Technologies How we view a network geographically Representing Networks in diagrams 3

1.1 Network Types/Technologies 4

Local Area Networks (LAN) Wireless Local Area Networks (WLAN) Backbone MAN WAN 5

1.2 Network Layers Most Commonly Used Models: OSI (Open Systems Interconnection Reference Model) Network Model Protocols & Protocol Data Unit (PDU) 6

1.2 Network Layers (Network Model) 7

1.2 Network Layers (CCNA TCP/IP Model) 8

1.2 Network Layers – Packetization Packetization is  breaking down user data into small segments  packaging these segments appropriately so that they can be delivered and reassembled across the network 9 *From Agarwal – Business Data Communications

1.2 Network Layers – 5 Important Data Comm. Tasks 10

1.2 Network Layers APPLICATION LAYER Software used by the users Common Examples: Protocols: PDU: 11

1.2 Network Layers TRANSPORT LAYER End to end management Responsibilities : (1) Link Applications Layer (2)Segmenting and Tracking (3)Session Management 12

1.2 Network Layers TRANSPORT LAYER (cont.) Protocols: PDU: 13

1.2 Network Layers NETWORK LAYER Decides where the messages should go Functions: (1)Addressing (2)Routing Protocol: PDU: 14

1.2 Network Layers DATA LINK LAYER Moves messages from one computer to the next Functions: (1)Controls Hardware (2)Formats Messages (3)Error Checking Protocol: PDU: 15

1.2 Network Layers PHYSICAL LAYER Hardware that transmits the message Protocols: PDU: 16

1.2 Network Layers - Summary Layer # Layer name Networking task Header information 5Application Specify user needsUser commands 4Transport Segmentation and reassembly of packets Sequence numbers 3Network Identifying and locating destinationAddress 2Data-link Error controlError check 1Physical SignalingNone 17

Network Model technologies by layer 18

1.2 Network Layers - Summary 19

1.2 Network Layers – Msg Transmission 20

1.2 Network Layers Standards IEEE (Institute of Electrical and Electronics Engineering) – develops US standards Formal Standardization Process Internet technology standards are publicly available as Requests For Comment (RFCs)  Highly recommended standards   HTTP:  TCP:  IP:  TCP/ IP tutorial:  Domain names: 21

Pros and Cons of using Layers CONS: 22

Pros and Cons of using Layers PROS: 23

Recap 1Network Types 1.1 Network Types LAN WLAN Backbone WAN 1.2 Network Layers Network Model Standards Pros/Cons 24

Thursday Chapter 2 – Application Layer Hardware Software Architecture Web 25