Daren Matthews

Cisco IOS is versioned using three numbers and some letters, in the general form a.b(c.d)e, where: Read more…

The 3550 is either a Layer 2 (L2) or Layer 3 (L3) switch, which depends on the software version and feature set that you install.

The naming conventions for 3550 images begin with either of these: Read more…

Here are some QoS examples configured on a Cisco Catalyst 3550:
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MPLS is deployed for managing traffic on IP networks, and in conjunction with other technologies like VPNs, will eventually replacing all other services, including dedicated T1s, Frame Relay, ATM and ISDN.
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The  GARP (Generic Attribute Registration Protocol) VLAN Registration Protocol (GVRP) defines a GARP application that provides the 802.1Q-compliantVLAN pruning and dynamic VLAN creation on 802.1Q trunk ports. GVRP is an application defined in the IEEE 802.1P standard that allows for the control of 802.1Q VLANs. Read more…

There is IEEE802.3 ethernet and Ethernet II.  THe former has a “length” field in it (and also an 802.2 LLC and ‘SNAP’ header) and the latter (the one we use most commonly common on TCP/IP networks) replaces length field with a “type” field… Read more…

The “class D” multicast address range is 224.0.0.0 to 239.255.255.255, with the private range falling between 239.0.0.0 to 239.255.255.255

This configuration tests multicast routing configurations using VLC: Read more…

This is a simple example and step-by-step configuration of two LAN segments connecting over a Frame Relay WAN link.  IPv6 Addressing is used. Read more…

This design shows how to ensure load balancing and resilience of Wireless Access Points connected to Two WLCs (Wireless LAN Controller).  The access points may also be placed into separate VLANs a per-vlan spanning-tree used to ensure and even more resilient design!

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I have just spent a wonderful few days in Lithuania, in the beautiful capital city of Vilnius, conducting a three-day training course in data communications. I was delivering the course on behalf of a training company here in the UK. The pace of the course was a little too fast, because there was a lot of material to cover.  In my opinion,  too much to explain in just three days.

I would have preferred to have designed my own course,  so I tried to include some cool and useful technical tips and knowledge – at least enough for keen students to research further.  If any student wishes to contact me, they can CLICK HERE and I will receive any question and then provide any help needed.  No fee – just friendly advice.

I would like to thank LATIS, the Lithuanian security technology engineers union, for their warm, kind hospitality.  My personal thanks to Pranis, Aurika, Rimuntas and Gaudenis. I hope to visit you again some day.
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