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Firewall Juniper SRX 300 programming

July 16, 2025

Image Description: My Juniper SRX 300 firewall and its configuration through the CLI

I acquired this router while preparing for the Juniper Networks JNCIA-Junos Associate certification. In case you didn't know, I am a certified specialist in Juniper Networks equipment. For more details, please visit the Computers & Networks page on my website.

Task Description: Creating Three Independent LANs with One WAN Connection

I was tasked with creating three independent local area networks (LANs) with a single wide area network (WAN) connection to the internet. The networks must be completely independent so that users in one network cannot see devices in the other networks. Each of the three networks has its own address space and DHCP server. Physical ports are allocated with two for each network, and one port is designated for external WAN connection. I programmed everything through the Command Line Interface (CLI).

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If you need to solve similar tasks, feel free to contact me. In addition to the JNCIA certification, I am also a certified Mikrotik specialist.

Wi-Fi and Network Solutions

I solve home Wi-Fi issues and create, maintain, and repair networks for offices, restaurants, warehouses, and industrial enterprises. I handle the installation of network, coaxial, and optical cables during construction. I also install surveillance systems of any type and complexity.

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Firewall Juniper SRX 300 programming

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