ok but same as in the video
The Professor Messer video does not use traditional PowerPoint slides; instead, it employs
lecture-style teaching with some on-screen textual mnemonics, layer lists, and a Wireshark
demonstration. To exactly match the video, here is a slide-by-slide PPTX outline capturing every
key point, list, and explanation, closely aligned with the presentational flow and examples from
the video.
Slide 1: The OSI Model
OSI: Open Systems Interconnection Reference Model
Describes the process that data takes across a network
Model for describing network operations
Not a protocol suite; Most modern protocols based on TCP/IP
Provides a universal language for discussing network problems
Slide 2: 7 Layers of the OSI Model
Layer 7: Application
Layer 6: Presentation
Layer 5: Session
Layer 4: Transport
Layer 3: Network
Layer 2: Data Link
Layer 1: Physical
Slide 3: Mnemonics for OSI Layers
Example: "All People Seem To Need Data Processing"
Application
Presentation
Session
Transport
Network
Data Link
Physical
Slide 4: Layer 1 - Physical Layer
Physical signals through cables or fibers
No protocols—just moving signals across media
Troubleshooting: bad cables, bad fiber, wireless interference
Typical tests: loopback, cable/fiber testing, checking adapters
Slide 5: Layer 2 - Data Link Layer
Communication between two devices (MAC address layer)
Includes Ethernet and wireless adapters
MAC address = Media Access Control address (hardware address)
Layer for switching, MAC address issues, adapter problems
Slide 6: Layer 3 - Network Layer
Routing layer (used by routers)
IP addresses and subnet masks
Handles fragmentation for smaller network frames
Any issue with IP addressing/routing = layer 3
Slide 7: Layer 4 - Transport Layer
Responsible for transport of information (post office layer)
TCP (Transmission Control Protocol) and UDP (User Datagram Protocol)
Data segmentation and reassembly
Port numbers in use
Slide 8: Layer 5 - Session Layer
Manages sessions (initiation, start, stop, restart)
Control protocols and tunneling are here
Session management between endpoints
Slide 9: Layer 6 - Presentation Layer
Formats data for display/use
Handles character encoding, encryption (SSL/TLS), decryption
Converts data to a format for the application layer
Slide 10: Layer 7 - Application Layer
User interface layer; what is seen on the screen
Where applications (HTTP, FTP, DNS, POP3) operate
Slide 11: Real-World Examples
Layer 1: Cables, fibers, signal on wire, wireless
Layer 2: Ethernet frames, MAC or EUI addresses, switches
Layer 3: IP addresses, subnet masks, routers
Layer 4: TCP/UDP port numbers, transport protocols
Layer 5: Control protocols, session setup, tunneling
Layer 6: Encryption/decryption (SSL/TLS), encoding
Layer 7: Visible applications & protocols
Slide 12: OSI Model in Wireshark Analysis
Layer 1: Frame size (bytes on wire)
Layer 2: Ethernet II, MAC address info
Layer 3: IP protocol, source/destination IP, DNS resolution
Layer 4: TCP protocol, port numbers (e.g., 443 for HTTPS)
Layers 5–7: SSL/TLS + application processing (email, webmail, etc.)
Slide 13: Summary
OSI model: 7 clear layers to describe all network communications
Universal for troubleshooting and understanding
Every protocol and issue can be mapped to an OSI layer
These slides follow the structure and sequence of the video, including all key definitions,
practical tips, and the Wireshark demo. This will allow recreation of the video’s “slide”
experience for revision or teaching in the most accurate way possible. If an actual downloadable
PPTX file is needed and file conversion tools are required, let me know, and instructions or a
direct link will be provided.