How to troubleshoot network connectivity issues

Some “upgrades” create more problems than they solve. Without documentation, a network refresh is guesswork. Unknown connections get cut. Patch panels go unverified. IT is left scrambling. With CC&N, you get a system—not a swap—with documentation that prevents outages, not causes them. Don’t settle for “new hardware.” Demand a new standard. Learn more 👉 https://lnkd.in/dt3Qw93p

Error in Configuration was Replicating a Problem Across Multiple Sites We received a call into our CovrEDGE support team about a switch rebooting into Rommon. After a few minutes of troubleshooting, our team had the switch back up and running. About 10 hours later, the site had another power failure, and the switch went back into Rommon. Another call into support and our team started troubleshooting. After a few minutes of looking at the configuration and logs as well as the boot up process, they noticed the switch was set to Manual boot upon reboot. What does that mean exactly? The switch had been configured to require manual bootup by having an engineer access the switch and manually boot the Bin File for it to reboot. It was a mistake but one that was copied to several other sites. Our team notice the error, made a recommendation and a plan was set to change the configuration. Hardware fails but our team does a good job of working to diagnose the problem and determine if it is a hardware issue or a configuration issue. If you are curious, here is what this looks like and how to fix it. switch: set ABNORMAL_RESET_COUNT=0 ASIC_PCI_RESET=1 AUTOREBOOT_RESTORE=1 BAUD=9600 BOOT=flash:cat3k_caa-universalk9.SPA.03.07.05.E.152-3.E5.bin; BOOT_LOADER_UPGRADE_DISABLE=1 BSI=0 CFG_MODEL_NUM=WS-C3850-12X48U-S CLEI_CODE_NUMBER=IPM8Y10ARB CSR_PCIERST_DISCONNECTED=yes D_STACK_DOMAIN_NUM=1 ECI_CODE_NUMBER=470242 LICENSE_BOOT_LEVEL=ipbasek9,all:ngwc; MAC_ADDR=xxxxxxxx  𝗠𝗔𝗡𝗨𝗔𝗟_𝗕𝗢𝗢𝗧=yes A simple command “set MANUAL_BOOT no” when in Rommon will resolve the issue. A new command for the other switches currently up and running will be made and replicated across all affected sites Switch#configure terminal Switch(config)# no boot manual #Edgeium #CovrEDGE #CostReduction #Cisco #NetworkEngineers #networking #network #leadtimes #networkengineering #Cisconetworking #networkinfrastructure

🔧 Network Troubleshooting Made Simple When facing connectivity issues, a structured approach saves time and avoids confusion. Here’s a quick step-by-step method I follow: 1️⃣ Identify the scope of the problem 2️⃣ Check physical connectivity (cables, ports, devices) 3️⃣ Diagnose with commands (ping, ipconfig/ifconfig, tracert) 4️⃣ Rule out DHCP & DNS issues 5️⃣ Test & Resolve A clear process = faster solutions ✅ 💡 Always start simple before diving deep! #Networking #Troubleshooting #IT #CCNA #TechTips

Port Mirroring: Key Tool for Easier Network Management Port Mirroring is a helpful feature that allows network administrators to copy traffic from one port to another. This mirrored traffic can then be monitored and analyzed using tools like Wireshark. DrayOS 5 routers now support this feature in the latest firmware, making it easier to capture and analyze network data when needed! Practical Benefits 📍Troubleshooting: Quickly capture and inspect traffic to find network issues or errors. 📍Performance Monitoring: Track bandwidth usage and identify potential bottlenecks. 📍Better Network Visibility: Get detailed insights to optimize your network setup. Port Mirroring is essential for maintaining network stability, especially when diagnosing and resolving issues. Since LAN Port Mirroring consumes CPU resources, remember to disable it after use to maintain optimal performance! Learn more on DrayTek website: https://lnkd.in/gWP9zqEM #Networking #PortMirroring #NetworkMonitoring #ITsecurity #DrayTek

Boost business Wi-Fi! Upgrade hardware, segment networks, and balance server loads for smoother operation. Learn network warning signs and discover strategies. #WiFiSecrets #BusinessEfficiency #NetworkTroubleshooting #Connectivity #ITSupport

Building a home networking lab to study for Network+ and have some hands on experience. This weeks progress : 1.Configured a managed switch from scratch. 2.Built a segmented network with multiple, isolated VLANs. 3.Set up a dedicated access point for a secure, wireless lab network. 4.Troubleshooted and solved complex physical, software, and logical networking issues. Next Up: Testing Legacy hardware on the various VLANs.

The TCP/IP model powers the internet — and every developer should know it. This video makes the layers and protocols crystal clear, even if you’re just starting out.

Wrapped up Chapter 6: Ethernet LAN Switching in my CCNA studies, and it’s wild how much is happening inside what looks like a simple Ethernet frame. ● Ethernet frames have structure: ○ Destination & Source MAC (6 bytes each, written in hexadecimal — base-16 using 0–9 and A–F) ○ Type/Length field (payload size or EtherType, like 0x0800 for IPv4) ○ Payload (the actual data, padded if too small) ○ Frame Check Sequence (CRC error check) ○ Minimum: 64 bytes. Maximum: 1518 bytes ● Switches + MAC tables: ○ Known unicast → forwarded straight out the correct port ○ Unknown unicast → flooded everywhere except the incoming port (“somebody must know this guy”) ○ Broadcast → sent to all hosts in the LAN ● MAC table behavior: ○ Learns dynamically by watching incoming frames ○ Ages out unused entries after a few minutes ○ Acts like the switch’s memory of who’s plugged in where ● Hexadecimal everywhere: ○ Two hex digits = one byte (8 bits) ○ That’s why MAC addresses always show up as 12 hex characters ○ Hex keeps Ethernet addressing compact and binary-friendly Next stop: Wireshark and ARP — time to see those broadcasts and floods in action instead of just reading about them. #CCNA #Networking #Ethernet #Hexadecimal #LearningInPublic

Boost business Wi-Fi! Upgrade hardware, segment networks, and balance server loads for smoother operation. Learn network warning signs and discover strategies in our Wi-Fi guide. #WiFiSecrets #BusinessEfficiency #NetworkTroubleshooting #Connectivity #ITSupport https://lnkd.in/eFwdqTDM