Once again Cisco has gone shopping and this time is has its eye fixed on a French based company call Sentryo which specialises in anomaly detection with real-time threat detection for industrial Internet of Things (IIOT) networks. Having the ability to network sensors will improve efficiencies and Cisco can offer its control systems to allow better visibility to detect anomalies and better secure networks. Sentryo was set up back in 2014 and according to Crunchbase has an estimated turnover of £3M annually. Cisco expect to finalise the acquisition by the first Quarter of 2020 but there is little detail on...
Will India Follow the USA in banning Huawei kit from its networks? Huawei has had a difficult year so far. The world’s leading telecoms kit maker and the worlds second largest smart phone manufacturer has had to contend with President Trumps ban on the 15th of March 2019 which effectively stopped the Chinese telecoms giant from selling smart phones or any telecoms kit into the US due to national security fear. There was a little easing of the trade ban in June when Huawei where allowed to sell some if its products in the US although the company remains on...
It looks likely that Huawei, everyone’s current favourite bad guy is planning to make a substantial number of people redundant in the United States in the next few weeks. Huawei, the huge Chinese telecoms and networking manufacturer has been under pressure from the Trump administration which has no started to feel the pinch and has announced that it will be making redundancies at it’s US R&D subsidiary called Futurewei Technologies who employs over 800 people. The redundancies will affect many hundreds of people working in R&D in Texas, Washington and California. Huawei, the Chinese manufacturer targeted by a Trump administration...
Physical Flow of data When the data arrives at its intended destination it will travel up the 7 layers to pop out onto the Users application as a for example an email or webpage. When the user on the left hand machine press the send button on their email program the email is sent down the stack starting at layer 7 and through the layers. There is no way of avoiding passing through a layer. As the data moves through each layer the functions of the layers will determine exactly what happens to the data. Logical flow of data The...
How Layers are used In a layered system, a layer is considered to be a service provider to the layer above it. The upper layer is considered to be a service user by the lower layer. The service user avails itself of the services of the layer below by sending a transaction to the provider. This transaction informs the provider as to the nature of the service that is to be provided. A layer cannot be by passed, even if the end user does not require the services of that layer, the user must still “pass though” the layer on...
NETWORK MODELS AND PROTOCOLS This next chapter will describe two very important concepts in networking known as protocol stacks. There are two very important protocol stacks which as a network engineer you must know the OSI model and the TCP/IP model. Knowledge of both these models will help you understand the role of various devices that go to make up a network also help you design, configure and fault find a network more efficiently. The OSI model One of the very first concepts I learnt when I entered this networking arena back in the 90’s was that of the “Protocol...
CABLING AND TOPOLOGIES Topology: Physical Bus A bus network is a single length of cable to which work Stations, printers, servers, routers etc. connect. There have been two major physical bus technologies: • 10Base5 • 10Base2 • 10Base5 This technology capable of 10Mbps and allowed a cable run of 500m with the maximum number of nodes connected to the wire limited to 100 devices at a distance of 2.5meters apart. 2.5 Meters is due to the wavelength of the signal used to transmit the data. At each end of the cable run there was a terminator (Resistor of 50ohms),...
CCNA TRAINING: THE NETWORK INTERFACE CARD AND BIA ADDRESS There are a few ways to connect to a network for this moment we will concentrate on a wired only connection. To connect to a network it is common to use a cable attached to a port on your P.C called an Ethernet port using an RJ45 connector. Every interface has been assigned a unique address called a “Burned in Address” which identifies the interface uniquely on the network. Every Frame which your device sends will include the unique BIA (Burned in Address) as a source address. The BIA The BIA...
How Binary Works Imagine this, you and your friend live across the road from each other, at night you wish to communicate using flash lights, you need to have an agreed code of light flashes. So you agree on the following code, to represent a single binary 1 you will switch the light on for one second and to represent a binary zero you will keep the light off for one second. Of course this is going to quickly go to the dogs but you understand the premise that we have agreed on a line code that we both understand,...
HOW DEVICES COMMUNICATE When I first started in networking the one thing that I could not get my head around was how does one machine communicate with another?, I understood that P.C’s used binary to communicate but what I could not visualise was how a parcel of data was sent from one interface to another in my mind I used to picture a precession of packets on the wire in line one after the other like in the diagram below. Of course I soon realised that this was not possible, we are talking about a single pair of wires to...
