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 OTDR (Optical Time-Domain Reflectometer) Explained for Everyone In fiber optics, keeping the network running smoothly is important. One of the best tools to check how well things are working is the OTDR. What is an OTDR? An OTDR is a device that tests fiber optic cables by sending light through them and looking at what comes back. This helps technicians find problems, check how long the cable is, and make sure everything is working well. Why is an OTDR Important? Find Problems Fast: It quickly spots breaks or issues in the cable. Monitor Performance: It checks how well the fiber is working by looking at things like signal loss. Efficient Maintenance: It helps decide what needs fixing first, saving time and money. Using OTDR technology makes fiber optic systems more reliable and helps prevent problems before they happen. As our internet and communication networks grow, tools like the OTDR will be key in keeping everything running smoothly. Let's aim for not just working networks, b...

 TLDR This article will guide your through the steps to enable SNMP in Cisco Routers and Switches Description Telnet to the router/switch prompt# telnet testrouter Go to the enable mode by specifying the password: Router>enable Password: Router# Go into configuration mode: Router#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)# Use the command below to add a Read-Only community string: Router(config)#snmp-server community public RO where " public " is the Read-only community string. To add a Read-Write Community string, use the command below: Router(config)#snmp-server community private RW where " private " is the Read-write community string. Exit the configuration mode and save the settings: Router(config)#exit Router#write memory Building configuration... [OK] Router# To enable SNMP traps, follow the steps below in the Configuration mode of the Router/Switch: First, set the host to which the traps have to be sent u...

This is a quick tutorial on 802.1q tagging and trunking that I've found to be very useful. The commands that can be used to configure the switches are below: >en #conf t #int fa0/1 #switchport mode access #switchport access vlan 2 #exit #int fa0/2 #switchport mode access #switchport mode access #switchport access vlan 3 #exit #int fa0/24 #switchport mode trunk #exit Set static IP addresses on the PC as follows PC1: 10.0.0.1 PC2: 20.0.0.2 PC3: 10.0.0.3 PC4: 20.0.0.4 My packet tracer file can be found here