The Switch is a network device that is used to segment the networks into different subnetworks called subnets or LAN segments. It is responsible for filtering and forwarding the packets between LAN segments based on MAC address. It operates at the data link layer of the OSI model and ensures seamless communication between devices by forwarding data packets.
Read More
This guide explores the architectural trade-offs, performance limitations, and modern design patterns (such as VRF-lite) to help you choose the right routing boundary for your enterprise. Part 1: Common Enterprise L3 Designs Routing on a core switch prioritizes raw. For enterprise network architects and senior infrastructure engineers, determining where Layer 3 routing logic should reside—on the core switch or the Next-Generation Firewall (NGFW)—is a foundational design decision. Firewalls typically have lower throughout than the Core, however it would give you security between VLANs There is no best solution, just depends on the customer requirements EDIT: also, it's not a stupid question, this comes up pretty regularly in the Enterprise and knowing why you would do one. How would you configure the connection between Core and Firewall? Currently we have a transit network (VLAN 100, 192. In this example, Internet access traffic of users passes through the BRAS, and then reaches the egress network of the firewall through the core switch. The hierarchy Ethernet network is a three-layer integrated setup of networking devices.
Read More
Step 1: Enter interface configuration mode Step 2: Configure the port as an access port (required for port security) Step 3: Enable port security Step 4: Set maximum number of secure MAC. If you try to set the maximum value to a number less than the number of secure addresses already configured on an interface, the command is rejected. Learn how to configure port security on Cisco switches to prevent unauthorized network access and pass your CCNA 200-301 exam. In MAC-flooding, an attacker can connect a laptop into an empty Switch port or empty RJ45 wall socket, and he can use hacking tools to generate millions.
Read More
A practical, engineer-friendly guide to choosing the right transceiver form factor by speed, port density, power, migration plan, and operational risk—built for 25G/100G networks in 2026. SFP (Small Form-factor Pluggable) modules are hot-swappable optical or copper transceivers used in switches, routers, firewalls, and network interface cards. Published: 2026 | Category: Network Hardware Knowledge Base / Optical Communications Core Keywords: SFP Module, SFP Transceiver, Small Form Factor Pluggable, What is SFP, SFP vs SFP+ Read Time: Approx. Different SFP modules support different: That's why selecting the correct model matters.
Read More
A dual power supply setup provides a crucial backup, ensuring the switch remains operational even if one power supply fails. This translates to increased network uptime, a key consideration for any environment where consistent connectivity is. But have you ever noticed some switches boasting two power supplies? The simple answer is redundancy. This guide covers everything from fundamental concepts and configuration steps to best practices, practical examples, PoE budget planning, and buying advice to help you optimize your network. Is there any harm in connecting the two DC inputs of a Cisco IE2000 to the same power supply? I understand that this not fully redundant- but I see from a previous employee response (copied below) that DC-A and DC-B are inputs to two separate internal power supplies. This article explains the differences and helps you understand which approach fits your application.
Read More+48 22 538 72 19
+49 30 983 21 44
ul. Postępu 14, 02-676 Warszawa, Poland