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Layer 2 Technologies

GPON vs. Traditional Ethernet Architecture

GPON (Gigabit Passive Optical Network) is used to reduce the number of active switching nodes in the network design. Network Design Best practice in Campus networks and many Datacenter networks (Not Massively Scale Datacenters), is to use Three-Tier; Access, Distribution and Core network design. Although the design decision depends on the scalability requirements in the …

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Datacenter Design: Shortest Path Bridging 802.1aq

IEEE 802.1aq Shortest Path Bridging (SPB) uses IS-IS as an underlying control plane mechanism that allows all the links in the topology to be active. In sum, it supports layer 2 multipath. SPB is used in the datacenter; however, it can also be used in the local area network. In this article, Figure-1 will be …

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ARP, ARP Inspection, ARP Types and Deployment Considerations

This article is the second of our layer 2 attacks identification and mitigation techniques series, which will be a part of a bigger series discussing Security Infrastructure. Dynamic ARP Inspection relies on DHCP snooping technology explained in the previous article. It’s strongly recommended to be familiar with DHCP snooping, if you are not, just take …

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