Tech Lesson

  • [ACMA Training #1] Introduction to Wireless LAN (802.11)

    Following the previous basic training on the ArubaCX switch, we would like to proceed with training on Aruba Wireless Local Area Networks (WLAN). In this post, we will provide a basic introduction to wireless LANs and explain the technologies involved. Introduction to Wireless LAN Organizations: To break down the term, wireless LAN is called a Wireless Local Area Network (WLAN). Various organizations responsible for these wireless LAN standard technologies…

  • [ACSA Training #40] Safe Maintenance

    Network management is an essential skill for both network administrators and engineers. In this post, we will explore various foundational knowledge necessary to understand and perform the most important network management techniques. Out-of-Band Management Port (OOBM): The ArubaOS-CX switch family includes an OOBM (Out-of-Band Management) port used exclusively for monitoring and managing the switch. Within the ArubaOS-CX operating system, a separate…

  • [ACSA Education #39] Stacking

    Stacking technology is necessary to design, implement, and configure a more resilient and stable high-performance network. In this post, we will explore this stacking technology and examine Aruba switch stacking technologies, specifically VSF (Virtual Switching Framework) and VSX (Virtual Switching eXtension). Operation Plane – Data / Control / Management Plane Network devices logically consist of 3…

  • [ACSA Training #38] OSPFv2 Operation

    In the previous post, we looked at what OSPF is as a protocol and how it works. Today, we will examine what needs to be kept in mind to actually operate OSPFv2. From a protocol perspective, there are two types of networks. Point-to-Point Network: Only two peers are located on the link. When an interface is configured as a point-to-point link, OSPF [assets] that if one neighbor exists on the interface…

  • [ACSA Training #37] OSPFv2

    OSPF is the most widely used method for routing traffic within an organization. Among them, OSPFv2 is used to route IPv4 packets within the corporate internetwork. Today, we will look at OSPF areas, router IDs, various message types, and neighbor states. Introduction to OSPF: RFC 2328 [regarding] OSPFv2 for routing IPv4 addresses…

  • [ACSA Training #36] Routing Protocols

    Before learning about routing protocols, we need to understand Autonomous Systems (AS). An Autonomous System can be described as a collection of routers under a management domain. In other words, an ISP (Internet Service Provider) owns its own internal network. Furthermore, the ISP possesses the autonomy to manage even the routers within that network. This is precisely what an Autonomous System (AS) is….

  • [ACSA Training #35] Routing Types

    We already covered routing in the previous post. We examined how actual packets move at Layer 3 along with IP routing tables. Now, let's take a look at the actual types of routing and the protocols involved. Types of Routing in AOS-CX: Routing devices make Layer 3 forwarding decisions based on the optimal path in the IP routing table…

  • [ACSA Education #34] VRRP

    In the previous post, we looked into the Default Gateway. An endpoint can only have one Default Gateway. And it can become a single point of failure. Looking at the figure below, if Core-1 fails, all hosts using Core-1 as the Default Gateway, including PC-1, will be isolated. How should we deal with this situation? Redundancy…

  • [ACSA Training #33] Routing

    Since a switch is a Layer 2 device, its ports can only execute Layer 2 functions and protocols, such as becoming a member of each VLAN (member port) or transmitting frames. When an endpoint is connected to a port used as a Layer 2 interface, it forwards an L2 frame based on the destination Layer 2 MAC address. ※ AOS-CX switch ports are Layer… by default

  • [ACSA Education #32] Layer 3 Fundamentals

    Having conducted approximately 30 training posts related to ACSA, I have covered content centered on Layer 2. Now, I would like to move up a level from Layer 2 and discuss Layer 3 content. We will examine Layer 3 topics such as IP packets, routing, and gateways. Let's start by finding out what routing is. Routing already refers to the interaction between devices within the same network (broadcast domain)...