Category Archives: LAN Switching

What is a BPDU

In a Local Area Network layer 2 broadcast domain, the Spanning Tree Protocol is a Data Link Layer protocol. It is standardized as IEEE 802.1D. As the name suggests, it creates a spanning tree within a mesh network of connected … Continue reading

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Rapid Spanning Tree Protocol

The IEEE 802.1D Spanning Tree Protocol was designed to keep a switched or bridged network loop free, with adjustments made to the network topology dynamically. A topology change typically takes 30 seconds, with a port moving from the Blocking state … Continue reading

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Ethernet switch market takes a breather in Q1

The Ethernet switching market has got off to a sluggish start in 2011, according to the latest Enterprise Networks Tracker report from market-watchers at IDC, with sales down 9.1 per cent year-on-year and 12.5 per cent over Q4 2010, to … Continue reading

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An examination of DHCP Snooping with option 82 on Cisco.

DHCP snooping is a DHCP feature that provides security by filtering untrusted DHCP messages from hosts or other devices on the network. DHCP snooping accomplishes this level of security by building and maintaining a DHCP snooping binding table. An untrusted … Continue reading

Posted in Access Control, Cisco, Data, Home Security, Infrastructure Security, Intrusion, LAN, LAN Switching, Network Security, Physical Security, Security, Small Business Secure, Tech Tips, Threat Management | Leave a comment

Layer 3 interfaces on Cisco Catalyst switches

Cisco Catalyst multilayer switches support three different types of Layer 3 interfaces: Routed Port – A pure Layer 3 interface similar to a routed port on a Cisco IOS router. Switch Virtual Interface (SVI) – A virtual VLAN interface for … Continue reading

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Network Design for a Small Business

The image below represents a basic network plan for a small company.  The goal of this post is to use this image to help describe basic concepts of networks and how they are typically constructed as well as why they … Continue reading

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