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#Switchport Access Vlan Command
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108
JOOne of the cleanest ways to think about layer three in OT is this. The MAC address is the permanent name printed on the device and the IP address is the temporary address you give it on a specific network. In a home network the router quietly hands out IP addresses and you almost never think about it. On the plant floor that same mechanism can create real headaches when you have PLCs, drives, remote IO, safety controllers, and industrial PCs all sharing the same infrastructure. If a device suddenly becomes unreachable, is it because the cable is bad, the switch is misconfigured, or the IP address changed without anyone noticing
As soon as you begin assigning static IPs to each device, you are taking responsibility for layer three. You need to understand which subnet you are on, which devices share that subnet, and what the default gateway should be if traffic must leave that local network. Add in routers or layer three switches and things can get confusing quickly if you only think of networks as flat collections of devices. This is where the OSI model becomes useful in real life. When IT says it feels like a layer three problem, they are usually pointing toward IP addressing, subnetting, or routing decisions, not your PLC logic.
Above that, the transport layer quietly shapes the behavior of your data exchanges. TCP offers reliability and ordering at the cost of overhead, while UDP trades those guarantees for simplicity and speed. Many OT engineers never have to pick one directly, but knowing the difference explains why some traffic can tolerate loss and other traffic cannot. It also influences how you think about diagnostics, packet captures, and performance issues. These are not abstract textbook ideas. They explain why certain industrial applications behave the way they do on your network.
#manufacturing #industrialautomation #plc #plcprogramming #plctraining #otnetworking #industrialnetworking #osimodel #ethernet #ethernetip #ipaddress #tcp #udp #networkengineering #controlsystems #controlsengineering #automationengineer #electricalengineering #scada #hmi #factoryautomation #plantfloor #datacommunications
@joltekinc
106
JOMost people hear the term IP address and immediately think of home WiFi or office laptops. On the plant floor that same concept becomes layer three of the OSI model and it quietly controls how every PLC, VFD, servo drive, remote IO rack, and safety device talks to everything else. The key insight is this. A MAC address is burned into the device by the manufacturer and never changes, while the IP address is assigned by you or by the network equipment. MAC is who the device is. IP is where it lives in the network right now. When something goes wrong in an OT network, knowing the difference lets you ask better questions. Is this a switch configuration problem, a routing issue, or simply two devices fighting over the same IP
In OT environments nearly every ethernet capable device can have its own IP address. That is powerful but it also means there are many more ways to misconfigure things. A device can show up with a default address, an engineer can change it in the field, or a router can hand one out automatically. If you do not understand how layer three works, you end up chasing ghosts that are really just misaligned subnets or duplicate IPs. Once you begin to think in terms of routing tables, default gateways, and address plans, you see the network not as magic but as a system you can reason about.
On top of that sits the transport layer, most often TCP or UDP. In many industrial devices you never explicitly choose the transport protocol but your applications certainly rely on it. TCP will make sure packets arrive and can retransmit if something is lost. UDP will simply send and not worry about confirmation. There are situations where each behavior makes sense. Understanding that tradeoff helps you grasp why some data feels rock solid while other traffic is designed for speed over guarantees.
#manufacturing #industrialautomation #plc #plcprogramming #plctraining #otnetworking #industrialnetworking #osimodel #ethernet #ethernetip #ipaddress #tcp #udp #networkengineering #controlsystems #controlsengineering #automationengineer #electricalengineering #scada #hmi #factoryautomation#automationtraining
@joltekinc
4.4K
GU๐ฉ๐๐๐ก ๐๐ผ๐ป๐ณ๐ถ๐ด๐๐ฟ๐ฎ๐๐ถ๐ผ๐ป ๐ฎ๐ป๐ฑ ๐ง๐ฟ๐๐ป๐ธ๐ถ๐ป๐ด | ๐๐ผ๐ฟ๐ฒ ๐๐ผ๐ป๐ฐ๐ฒ๐ฝ๐ ๐ถ๐ป ๐๐ป๐๐ฒ๐ฟ๐ฝ๐ฟ๐ถ๐๐ฒ ๐ฆ๐๐ถ๐๐ฐ๐ต๐ถ๐ป๐ด
In enterprise networks, switches must carry traffic for multiple VLANs.
๐๐ฒ๐ ๐ฐ๐ผ๐ป๐ฐ๐ฒ๐ฝ๐๐:
๐น Trunk ports carry multiple VLANs
๐น IEEE 802.1Q is used for VLAN tagging
๐น Enables communication between switches
๐น Supports scalable network design
๐ VLAN trunking is a fundamental concept for CCNA, CCNP, and enterprise networking roles.
๐ฌ ๐ช๐ฎ๐ป๐ ๐๐ผ ๐น๐ฒ๐ฎ๐ฟ๐ป ๐ฉ๐๐๐ก ๐ฐ๐ผ๐ป๐ณ๐ถ๐ด๐๐ฟ๐ฎ๐๐ถ๐ผ๐ป ๐ฎ๐ป๐ฑ ๐๐๐ถ๐๐ฐ๐ต๐ถ๐ป๐ด ๐๐ถ๐๐ต ๐ต๐ฎ๐ป๐ฑ๐-๐ผ๐ป ๐น๐ฎ๐ฏ๐?
๐ฒ Message us on WhatsApp to get started:
๐ https://api.whatsapp.com/send?phone=%2B919289682705&text=Hi
#VLAN #Switching #CCNA #CCNP #EnterpriseNetworking #Cisco #NetworkEngineer #GuiNetTechnologies
@guinettechnologies
145
JOWhen people talk about networks they often jump straight into IP addresses and protocols, but on the plant floor the physical layer quietly decides whether anything works at all. In an office you have short patch cords, neat racks, climate controlled rooms, and premade cables that rarely move. In an industrial environment you are pulling ethernet cables through conduit, around machines, past high voltage feeders, through wet and dusty spaces, and into cabinets that slam shut all day. The result is a layer one that lives a very different life than an office switch. Crimps are not always perfect, shielding is not always ideal, and electrical noise is a constant companion.
If you work in OT and you want to become the person who actually solves problems, you cannot ignore that physical reality. Before you blame a PLC or a SCADA server, you need to know how to inspect connectors, trace cables, look for tight bends, and recognize when a cable has been run right beside a high voltage line that is injecting noise into your packets. This is why layer one is one of the most important layers in our industry even if it is rarely discussed in meetings. Many intermittent communication issues are really physical problems wearing a software mask.
Right behind that sits the data link layer. Every industrial device with an ethernet port has a MAC address printed somewhere on its body. PLCs, drives, IPCs, gateways, industrial controllers, they all live on the network as unique hardware identities long before you give them an IP address. When IT talks about a layer one issue or a layer two problem, this is the world they are referencing.
#manufacturing #industrialautomation #plc #plcprogramming #plctraining #otnetworking #industrialnetworking #osi #osimodel #ethernet #rj45 #networkcabling #plantfloor #factoryautomation #controlsystems #controlsengineering #electricalengineering #automationengineer #scada #hmi #phoenixcontact #arduino #industrialit #datacommunications #engineeringeducation
@joltekinc
71
DAB. 802.1Q tagging. This allows multiple VLANs to traverse a single link between two Layer 2 switches by tagging Ethernet frames with VLAN identifiers. A trunk link using 802.1Q is the standard method for transferring traffic from multiple networks across interconnected switches.
Why The Other Options Are Incorrect
A. Jumbo frames. Jumbo frames increase the maximum transmission unit to improve efficiency but do not provide VLAN separation or support multiple networks on the same link.
C. Native VLAN. The native VLAN is the untagged VLAN on a trunk link. It does not enable multiple networks by itself and only applies after 802.1Q trunking is already configured.
D. Link aggregation. Link aggregation combines multiple physical links into one logical link for higher bandwidth and redundancy, but it does not enable VLAN tagging or multi-network traffic on its own.
#CompTIA
#NetworkPlus
#N10009
#ITCareers
#Certification
@dailydebian
2.9K
GU๐ฅ๐ผ๐๐๐ฒ๐ฑ ๐ฃ๐ผ๐ฟ๐ ๐๐ ๐ฆ๐๐ถ๐๐ฐ๐ต๐ฒ๐ฑ ๐ฃ๐ผ๐ฟ๐ | ๐จ๐ป๐ฑ๐ฒ๐ฟ๐๐๐ฎ๐ป๐ฑ๐ถ๐ป๐ด ๐๐ฎ๐๐ฒ๐ฟ ๐ฎ ๐ฎ๐ป๐ฑ ๐๐ฎ๐๐ฒ๐ฟ ๐ฏ ๐๐ป๐๐ฒ๐ฟ๐ณ๐ฎ๐ฐ๐ฒ๐
In enterprise networks, switch ports can operate in different modes.
๐น ๐ฅ๐ผ๐๐๐ฒ๐ฑ ๐ฃ๐ผ๐ฟ๐
โข Operates at Layer 3
โข Assigned an IP address
โข Used for routing between networks
โข Supports routing protocols
๐น ๐ฆ๐๐ถ๐๐ฐ๐ต๐ฒ๐ฑ ๐ฃ๐ผ๐ฟ๐
โข Operates at Layer 2
โข Assigned to a VLAN
โข Used for switching within a network
โข Forwards traffic based on MAC addresses
๐ Routed ports enable routing, while switched ports enable switching.
๐ฌ Want to learn Switching and Routing with real-world labs?
๐ฒ ๐ ๐ฒ๐๐๐ฎ๐ด๐ฒ ๐๐ ๐ผ๐ป ๐ช๐ต๐ฎ๐๐๐๐ฝ๐ฝ ๐๐ผ ๐ด๐ฒ๐ ๐๐๐ฎ๐ฟ๐๐ฒ๐ฑ:
๐ https://api.whatsapp.com/send?phone=%2B919289682705&text=Hi
#CCNA #CCNP #Switching #Routing #NetworkEngineer #EnterpriseNetworking #GuiNetTechnologies
@guinettechnologies
3.6K
SEEver wonder how different computers talk to each other without getting their bytes scrambled? ๐คฏ Letโs talk about Network Order vs. Host Order! ๐งต๐
When it comes to storing data, CPUs have their own preferences (a.k.a. Endianness):
๐น Host Order: Many modern processors (like x86) use โLittle Endianโ โ storing the least significant byte first. Itโs fast for the CPU, but a bit chaotic for a universal network!
๐น Network Order: The internet relies on a strict standard to avoid confusion. That standard is โBig Endianโ โ the most significant byte goes first!
So, how do a Little Endian CPU and a Big Endian network communicate? Enter the Conversion Zone! ๐
C/C++ functions like htons() (Host TO Network Short) and ntohl() (Network TO Host Long) act as universal translators. They flip the bytes into the correct order before they hit the wire, and flip them back when they arrive at the destination.
๐ก Key Takeaway: Always convert your data to Network Order before sending it out into the wild internet to guarantee compatibility, no matter what machine is on the receiving end!
#semiconductor #vlsi #engineering #semiconductorclub #electronics
@semiconductorclub
84
GACCNA Topics (Basic Routing and Switching)
@gates_solutions
127
JOLearn VLAN tagging processes in under a minute. This short explains how switches label frames, keep multiple VLANs separated on one cable, and prevent network chaos. Perfect for CCNA students, IT beginners, and anyone learning networking fundamentals. Follow Phill Explains Tech for fast, simple tech breakdowns.
VLAN tagging explained, VLAN process, CCNA VLANs, switch tagging, 802.1Q basics, networking fundamentals, VLAN trunking, frame tagging, LAN switching, IT networking learning, beginner networking, enterprise networking basics, tech education, networking explained simply
#VLANs #VLANTagging #Networking #CCNA #CiscoNetworking #ITLearning #TechReels #LearnIT #Switching #PhillExplainsTech
@joinphotonphill
475
CY๐ฆ Policy Based Routing (PBR) โ Explained Visually
Traditional routing follows the routing table. Policy Based Routing (PBR) lets you override that logic and forward traffic based on source IP, VLAN, or other criteria.
This diagram shows:
๐น How VLAN 2 traffic is forced over ISP1
๐น Use of Access Lists, Route Maps, and Interface attachment
๐น Real IOS configuration commands in action
๐น A clear end-to-end traffic flow from LAN to Internet
Perfect for CCNA / CCNP students, network engineers, and anyone working with multi-ISP environments.
#education #networkengineer #networking #technology #network tech fblifestyle
@cyberojtechnology
4.0K
SA๐ 1. Physical Lab Setup (Look Like a Data Center)
โ
A. Rack & Infrastructure
Make your lab visually and practically professional:
19-inch Network Rack (42U or 27U)
Patch Panels (Cat6)
Horizontal & Vertical Cable Managers
PDUs (Power Distribution Units)
UPS (Online UPS preferred)
Rack Labels (Rack Unit numbers, Device Labels)
๐ This will make your lab look like ICICI / Airtel DC level.
โ
B. Cable Management (Most Important)
Real DC engineers judge lab by cable quality.
Do this:
Use color-coded cables
Blue = Data
Red = Uplink
Yellow = Management
Green = Voice
Velcro ties (No plastic zip ties)
Proper dressing from patch panel to switch
@saga_salvi
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