Aruba Switching

8. VRRP (Virtual Router Redundancy Protocol)

An endpoint may only have one DG (Default Gateway), and a single DG means a single point of failure. In this example, if Core-1 is the DG for PC-1 and Core-1 fails, PC-1 and any other endpoints using Core-1 as the DG will be isolated. You could add another DG for redundancy, but you would have to somehow change the…

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Aruba Switching, Technology

7. IPv4 Routing Part 1

Routing IP routing connects VLANs together and routes packets between them. Routing devices use Layer 3 packet analysis to forward L3 packets. Layer 2 switches forward frames among devices in the same LAN by processing Layer 2 headers.  This is based on destination MAC addresses. Layer 3 devices move packets between LANs based on Layer 3 IP addresses. Routing Layer…

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Aruba Switching, Technology

6. Link Aggregation

Link Aggregation Without link aggregation, if you used two links to connect two switches together, the two links would create a loop and STP would automatically block one of the ports. Link Aggregation fixes this issue by bundling multiple physical interfaces into a single logical interface. Since STP sees this as a single interface there is no blocking.    …

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Aruba Switching, Technology

5. Spanning-Tree Protocol

Redundancy In the above example on the left, if Core 1 fails then the network is down and client A won’t be able to communicate with client B. In the example on the right, if Core 1 fails the network will say up as Core 2 is available and the Client can communicate through this. While this mitigates a single…

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Aruba Switching

4. VLANS

VLANS VLANs are used to isolate endpoints so you have better control over the traffic Default VLAN is VLAN 1 Devices in the same VLAN can communicate without routing.   Collison Domains On a Layer 1 Hub, only one ethernet host on a particular segment may transmit at a time, otherwise there is a collision. This is controlled by an…

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PowerShell, Technology

Creating Bulk DNS Records with PowerShell

PowerShell is a great tool for managing your repetitive tasks with DNS records. In this example I will show you how you can bulk import DNS records to Windows DNS servers.     Populate a CSV with your device names and IP’s In PowerShell, import your CSV with the devices and IPs: #Import CSV $devices = Import-Csv “\\ServerPath\devices.csv” 3. Loop…

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PowerShell, Technology

Automating Windows Server Updates with PowerShell

Introduction If you are anything like me, you probably get fed up managing Windows Server updates manually pretty quickly. Logging onto servers, checking for updates, installing them, rebooting them, trying to keep track of which servers have been updated, what updates were installed etc… etc… I wanted to automate the process but still have control over when the updates were…

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Azure, Office 365, Technology

16. Monitoring and maintaining Azure AD

Analysing and investigating sing-in logs to troubleshoot access issues Viewing logs Go to Azure AD -> Sign ins From here view and filter the sign in logs. You can see information like: – IP address – Date time – Applications – Login Status (success/failure) – location If you click on a log entry you get more information such as the…

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