Post Views: 1,218 Some of you know, that to master networking technologies you have to have a complete grasp of the fundamentals. Furthermore, like any technology, if you don’t review these fundamentals often, they can become a bit hazy in our memory. The question, then, is how can I come up to speed on the […]
Learning the Network Science Fundamentals Read More »
Post Views: 4,221 We get this question often: I am new to Telecom, or I just started at a service provider, and I need to learn Telecom basics – how can I come up to speed? This is a GREAT question – and the truth is: you need to get up to speed. The more
New to Telecom/Datacom. How can I come up to speed? Read More »
Post Views: 1,451 Great question! One I have received many queries on lately. Let’s get some terms out of the way first: ACI = This stands for Cisco Application Centric Infrastructure, so it is not one thing, but rather a collection of things. From the Cisco ACI web page: Cisco ACI consists of: The new Cisco
How does Cisco APIC and ACI fit in the SDN world? Read More »
Post Views: 2,493 Many of our MPLS students and colleagues ask us about VRF Lite. The common question is “Can I use VRF Lite to simplify MPLS configuration?” The answer is, that VRF Lite actually has nothing to do with MPLS nor MPLS L3VPN per se. Let’s define what VRF Lite is. A VRF is
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Post Views: 1,300 By now you have all heard of the Internet of Things (IoT) or the Internet of Everything (IoE). This term is not really new and there is an interesting history to the concept. Different folks give varying definitions but they all share a common concept and that is that this wonderful connectivity
A History of the Internet of Things (IoT) Read More »
Post Views: 1,446 We thought it would be useful to our networking colleagues to provide an overview of the OpenFlow protocol. Let’s begin with a broad definition of what OpenFlow is. OpenFlow is a communications protocol that uses network-centric, network-aware intelligence in it’s communication design. OpenFlow works on Software Defined Network (SDN) controllers
Post Views: 1,086 At CellStream, we made a nationwide tour over several years with our POTS to Pipes program. This program clearly defined what network operators (Telcos, especially the rural Telcos) needed to do to prepare themselves for the changes rapidly redefining their role in communications. POTS to Pipes 1 focused on the technical knowledge
Living out POTS to Pipes Read More »
Post Views: 1,518 Accessing the Internet is almost taken for granted today by most workers. They get very comfortable simply opening the lid to their laptop, turning on the wireless or connecting a cable and having access. For many of our clients, this notion of “open access” has been a continual challenge. On the one
Switch Port Security Usage in Cisco IOS Read More »
Post Views: 3,249 As most of us know, a key to managing the Internet is knowledge of TCP and UDP port numbers. Cisco IOS uses Access Control Lists for many purposes, but in this tip, we will focus on TCP and UDP port numbers. Port numbers are unique, well-known, registered or ephemeral numbers used by
UDP and TCP Port Number Usage in ACL’s in Cisco IOS Read More »
Post Views: 1,787 Network broadcasts can create a huge amount of traffic on your organization’s network. When one device sends out a single broadcast, that broadcast goes to all devices on the subnet or VLAN. How can you manage these broadcasts to make your network more efficient? One method is to use Cisco Catalyst broadcast
Storm Control for Switches in Cisco IOS Read More »
Post Views: 1,746 Welcome to our Cisco IOS Classic Interface Commands Cheat Sheet. You can see our other IOS cheat sheet here. You can view all our Cisco IOS How To’s here. Here are the most frequently used Interface commands as a quick reference/cheat sheet. This will help you remember the key interface configurations: Important
Cisco IOS Classic Interface Commands Cheat Sheet Read More »
Post Views: 2,467 The primary purpose of the show interfaces command is for displaying the equipped interfaces and their status. Here’s the information you can get about an interface from this command: Interface type Status Speed and duplex Encapsulation Errors on the interface The last time the interface flapped The last time the error counters
Show Interfaces Command in Cisco IOS Read More »
Post Views: 2,307 The Show Environment command can be very helpful to alert you of potential hardware issues. You will need to access this command in global Exec mode. Here are the options available for the Show Environment command: show environment [alarms | all | fans | hardware | last | leds | power-supply |
Show Environment Command in Cisco IOS Read More »
Post Views: 1,632 What is Policy-based Routing? With policy-based routing (which we will call PBR from here on out), you get the option to implement policies that selectively cause packets to take different paths. Additionally, PBR can mark packets so that certain types of traffic get prioritized. One example of PBR is, say that your
Policy Based Routing feature Usage in Cisco IOS Read More »
Post Views: 2,175 Point-to-Point (PPP) Protocol is an excelent Layer 2 protocol used to establish a direct connection between two nodes. It can provide connection authentication, transmission encryption (using ECP, RFC 1968), and compression. PPP was designed somewhat after the original HDLC specifications. The designers of PPP included many additional features that had been seen
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