Mastering the Command: Saving Your EtherChannel Configurations

Which command is used to save the running configuration after creating an EtherChannel?

• A. write memory
• B. copy run start
• C. save config
• D. commit

Answer: (B)

The command that is used to save the running configuration to the startup configuration after creating an EtherChannel is the one that copies the current running configuration to the startup configuration file in non-volatile memory. This ensures that any changes made, including the creation of the EtherChannel, are retained even after the device is rebooted. The chosen answer is correct because the command "copy run start" specifically performs this function. It effectively copies the active configurations, which includes the EtherChannel settings, to the startup configuration of the device, ensuring persistence across reboots. Other options have different functionalities. For instance, while "write memory" achieves a similar outcome (it also saves the running configuration), it is more of an older command and its usage has become less common in modern Cisco IOS. "Save config" is not a recognized command in Cisco IOS, and "commit" is typically associated with configuration changes in a different context, such as in a device utilizing a different command structure or in specific device types like Cisco's IOS-XR. Thus, "copy run start" is the most accurate and recognized command for this purpose in traditional Cisco IOS environments.

When it comes to managing network configurations, particularly in a Cisco environment, understanding the correct command for saving your settings can save you a lot of headaches down the road—especially when it involves something as vital as becoming proficient with EtherChannel. You know what I mean? Picture this: you've just painstakingly set up an EtherChannel, and if you don’t save that configuration, all your hard work could vanish in an instant. Let's break down how to ensure your configurations stick around.

The command you’re looking for to save your running configuration after creating an EtherChannel is copy run start. This command is crucial because it transfers your current active configuration—where all your settings live—into the startup configuration file stored in non-volatile memory. Kind of like saving your work before you shut down your computer; it’s that fundamental.

So, why is this important? Well, executing copy run start guarantees that when your network device reboots, it remembers the settings you painstakingly created, including your newly formed EtherChannel. Without it, those settings are just fleeting thoughts, lost in the digital ether.

You might be wondering about other options like write memory or laying your hands on a mythical command called save config. Fun fact! While write memory technically achieves a similar goal—saving your running configuration for future use—it's considered a bit old-fashioned these days. Think of it like using a flip phone when you could have the latest smartphone. It's not incorrect, per se, but there’s a better, more accepted way!

Now, if you were to type in save config, you'd find yourself staring at an error. Why? Because it’s simply not a recognized command in Cisco IOS. And what about commit? Well, this one is a bit of a misfit; it’s usually associated with a different context, often seen in devices running IOS-XR rather than keeping your configurations alive in traditional scenarios.

In short, mastering the correct command to save your configurations isn’t just about passing an exam. It’s about real-world applications too. Think about how often you rely on your devices remembering their states; it’s a cornerstone of network management, and being fluent in these commands boosts your confidence as a network engineer. And really, who doesn’t want a little extra confidence stepping into that interview or on-call environment?

So, the next time you find yourself configuring an EtherChannel, remember to hit that magic command—copy run start—and give yourself peace of mind. Trust me, your future self is going to thank you for it!