After six years in embedded I am still not able to fully understand OSI model, in a way to connect different signals, protocols, applications used to specific OSI layers. Is abstraction all about OSI, or there is also some deeper purpose of it?
The OSI model or Open Systems Interconnection Model is just a way of showing how a computer networking system works. Its similar to the TCP/IP model.
There was a guy on YouTube that made a video about the OSI model sung to the tune of "If you're happy and you know it clap your hands". The only distinct lyric I can remember is rhyming with learning OSI the next line would be "I'd rather stick a needle in my eye" My computer networking class i was in watched it and I haven't been able to find it since.
Forget 304 I need to learn what is router and NAT
I studied this a while ago in high school and I made a conclusion that it's just a hypothetical thing to increase syllabus, Is it true? Or it's used irl by sys admins?
In this document, we will present an overview of M2M communication over a wired network-based motor PID controller. This experiment is considered as IoT using M2M (internet of things), as the motor device is controlled via ethernet-based communication.
Could anyone please explain this conceptual framework to me and what kind of network attacks can occur at the various layers???
Hi Everyone,
A lot of you already know I covered the full CompTIA A+ course for free with a dedicated video for each of the 18 official modules.
I'm doing something similar for the new Network+ N10-008 course except this time I won't be making a dedicated video for each module since the topics are a bit more advanced so it might be a bit overwhelming for some viewers.
I'm instead going to cover the full course but I'll chop each module into smaller bite size videos to make the topics easier to understand and follow.
Like usual I will be covering the full course and here is the first lesson which is the first topic in the official New Network+ course:
Anyone have any hands-on ideas for a Layer 2 Lab? I am in the middle of teaching Switches/Hubs and am looking for inspiration. Right now my only thoughts are to see the MAC address table via a command line...but I'm trying to think of one more cool/gimmicky thing we could do like that ?
The switch I have inherited in my classroom is a Cisco Catalyst 2950. 24 port.
Thanks for reading.
I was trying to understand various concepts in STOMP like 'frame' and I ended up in this so answer. From what I gather, OSI model is like an onion. Each layer adds high level meta info on top of the low level info.
But I have a hard time connecting the various levels to real world examples. I assume a simple JSON object is the first level of 'data' and an HTTP call is somewhere there, but that's where my ability to translate the OSI model to actual stuff ends.
Good morning all. I know it’s a bit random, but I wanted to share with you guys the only way I was finally able to memorize the OSI model layers: A Pet Sea-Turtle Needs Dry Pants. Thank you for your time. 🙂
To whoever has been asked or asked a question regarding the OSI model, what was it and what did you say? Did you just list them? were you told to list the protocols at each layer? Were you told to explain what each layer does? Did it get any harder than that?
Happy New Years CISSP studiers!
The First, greatly anticipated, MindMap video for Domain 4 is now available. This one focuses on the OSI Model: https://youtu.be/6X4A6B94vmw
Topics covered include The OSI Model, OSI Layer 1: Physical, Media, Wired: Twisted Pair, Coaxial, Fiber Optic, Wireless: Radio Frequency, Infrared, Microwave, Network Topologies (Bus, Tree, Star, Mesh & Ring), Handling Collisions (CSMA/CA & CSMA/CD), Layer 1 Devices (Hubs, Repeaters & Concentrators), Layer 1 Protocols (802.1x), OSI Layer 2: Datalink, MAC Address, Layer 2 Devices (Switches & Bridges), Layer 2 Protocols (ARP, PPTP & SLIP), OSI Layer 3: Network, IP Address, Layer 3 Devices (Routers & Packet Filtering Firewalls), Layer 3 Protocols (ICMP, IPSec & IGMP), OSI Layer 4: Transport, Ports = Services, Common Ports, Layer 4 Protocols (TCP/UDP & SSL/TLS), OSI Layer 5: Session, Layer 5 Devices (Circuit Proxy Firewall), Layer 5 Protocols (NetBIOS & RPC), OSI Layer 6: Presentation, OSI Layer 7: Application, Layer 7 Devices (Application Firewalls), Layer 7 Protocols (HTTP/S, DNS, SSH, SNMP, LDAP & DHCP)
Here are the other review / MindMap videos I have completed so far:
Domain 2
Domain 3
- Models & Frameworks
- Evaluation Criteria
- Trusted Computing Base
- Vulnerabilities in Systems
- Cloud
- Cryptography
- Digital Certificates, Digital Signatures, PKI & Key Management
- Cryptanalysis
- Physical Security
Domain 4
- OSI Model
- Networking (coming soon)
- Network Defense (coming soon)
- Remote Access (coming soon)
Domain 5
Domain 6
- Security Assessment and Testing
- Vulnerability Assessment and Penetration Testing
- Logging & Monitoring
Domain 7
- Investigations
- [Incident Respo
I’ve read and seen videos on the OSI model and from what I remember it’s just a reference model for how you should develop a network in a computer but it’s not strict in that you should follow it exactly how it looks?
I could be misremembering but if I’m not then my question is why do we use it in the first place? Is it just a checklist of sorts to make sure we’re including the main parts?
Also as a follow up question, in networking I always see ports as in port (long number) I am always confused are these actual physical ports?
I've watched the Jason Dion video about it, so I'm not in the dark too much.
Does it come up on the exam, or is the focus more on the OSI Layer model?
1 Physical
- this is like bits that get sent through a physical wire such as rj45
2 Data link
- this is where bits become frames or vice versa.
3 Network
- frames become packets.
- frams come and go from Mac address. This is normally hardware.
4 Transport
- IP address -software -packet become segments -tcp or udp
5 Session
- starts sending segments to applications
- segments start being put pack in order
6 Presentations
- encryption or decryption to verify user to access data.
7 Applications
- it's what you see on the screen. Gmail, movies, gamea, ect...
credit: https://www.instagram.com/icssindia.in/
The Open Systems Interconnection model (OSI model) defines a concept where every function of a computing system resides at one of its seven levels. When people say, “Layer 3 routing” or “L7 load balancing” they are referring to the OSI Model.
It is an incredibly handy tool for troubleshooting as it reminds you to check the system at each layer.
I work in networking and I am curious if it is the same layer 2 or if they are completely seperate
