Category Archives: Networking

An Aruba Central group is a configuration and management boundary, not a synonym for a building, department, or physical campus. Devices assigned to a group inherit an intended management model and shared settings; sites provide a different view of physical location and operational context. Confusing those roles causes avoidable problems when an access point is […]

ClearPass policy design begins with a question about access: which device or user is asking to enter the network, what evidence identifies it, and which specific privileges should follow from that decision? A working authentication server is only part of the answer. A campus deployment must align switch and access-point behavior, identity and device records, […]

Aruba CX Virtual Switching Extension, or VSX, couples two compatible switches so a downstream device can use resilient multichassis connectivity while the peers retain separate control planes. The architecture is especially useful in a distribution or core role, where a single-switch failure should not require a complete rebuilding of adjacent device paths. It is not […]

Aruba Dynamic Segmentation is an approach to applying network access rules according to endpoint identity and role rather than relying entirely on a permanently assigned access VLAN. It is intended for environments where the same physical edge may connect managed laptops, unmanaged devices, phones, printers, and guests. The access-control decision should follow the role and […]

Cloud NAT provides managed source network address translation for resources that need outbound connectivity without external IP addresses. At small scale it can feel transparent. At large scale, port allocation, NAT IP capacity, connection patterns, regional topology, and configuration changes become architectural concerns that can produce packet drops without any problem in the destination service. […]

VXLAN is an overlay technique for carrying Layer 2 segments across a routed Layer 3 fabric. Its value is not simply that it creates “more VLANs.” It separates tenant or workload segmentation from the physical topology and uses a 24-bit VXLAN Network Identifier, or VNI, to scale logical networks far beyond the 12-bit VLAN identifier […]

Wi-Fi channel planning is the process of assigning spectrum so neighboring access points can provide capacity without spending most of their airtime contending with one another. The objective is not to make every AP transmit at maximum power or to choose the widest channel available. Good plans balance channel reuse, transmit power, client density, interference, […]

SD-WAN path selection is easiest to misunderstand when it is treated as a faster version of ordinary routing. A routing table still matters, but an SD-WAN edge can make forwarding decisions using policy, application identity, and measured path quality across multiple transports. The preferred path for a voice call may therefore differ from the preferred […]

Power over Ethernet changes a switch port from a data connection into a power-delivery circuit. That is convenient for access points, cameras, phones, sensors, badge readers, and other edge devices, but it also introduces an electrical planning problem: the switch can have enough physical ports for the design and still lack enough available power to […]

DHCP snooping and Dynamic ARP Inspection protect different parts of the same local-network trust problem. DHCP snooping controls which switch ports are allowed to provide DHCP server messages and builds a binding table from observed address assignments. Dynamic ARP Inspection, or DAI, can use that binding information to validate ARP traffic before it is forwarded. […]

Fiber troubleshooting is less about recognizing connector names than about isolating where optical loss, contamination, polarity, or physical damage enters the link. CompTIA Network+ N10-009 expects that evidence-driven sequence: identify the fiber type and interface, understand the expected path, inspect and clean connectors, measure loss correctly, and avoid replacing components at random. Fiber behaves differently […]

Packet filters help analysts reduce a large stream of frames into the evidence needed for one question. The first distinction is fundamental: a capture filter decides which packets are recorded in the first place, while a display filter decides which already-captured packets are shown. For CompTIA Network+ N10-009, knowing that difference prevents a common troubleshooting […]

When preparing for Cisco 350-401 ENCOR, VXLAN fabrics are easier to reason about when the underlay and overlay are treated as two related but distinct systems. The underlay is the IP transport that makes VTEP loopbacks and BGP peers reachable. The overlay is the tenant or service topology carried across that transport, typically using VXLAN […]

For readers studying Cisco 350-401 ENCOR, wi-Fi 6E is not simply Wi-Fi 6 with a higher channel number. It extends 802.11ax operation into the 6 GHz band, creating access to cleaner spectrum and many more wide channels, but only for clients and infrastructure that support the band and the regulatory rules that govern it. A […]

When preparing for Fortinet NSE5-FSW-AD-7-6, FortiAuthenticator can act as a RADIUS AAA server for network devices, but a secure design depends on much more than entering a shared secret and pointing a switch or firewall at the appliance. RADIUS requests arrive from registered clients, FortiAuthenticator selects a matching policy, that policy determines the authentication type […]