The document discusses the star topology for computer networks, in which all computers or stations are directly wired to a central hub or switch, and describes the advantages as easier troubleshooting when issues occur and disadvantages as higher cost and a single point of failure at the central device.
IT6601 MOBILE COMPUTING UNITI
INTRODUCTION
Mobile Computing – Mobile Computing Vs wireless Networking – Mobile Computing Applications – Characteristics of Mobile computing – Structure of Mobile Computing Application. MAC Protocols – Wireless MAC Issues – Fixed Assignment Schemes – Random Assignment Schemes – Reservation Based Schemes.
The presentation introduces to the computer network basics. Local, metropolian and wide area networks explained. Point-to-point, bus and star network topologies. Unicast, multicast and broadcast transmissions. What is a broadcast storm and how to split a broadcast domain. Virtual local networks (VLANs), VLAN tags, VLAN trunks and multilayer switches are also explained.
IT6601 MOBILE COMPUTING UNITI
INTRODUCTION
Mobile Computing – Mobile Computing Vs wireless Networking – Mobile Computing Applications – Characteristics of Mobile computing – Structure of Mobile Computing Application. MAC Protocols – Wireless MAC Issues – Fixed Assignment Schemes – Random Assignment Schemes – Reservation Based Schemes.
The presentation introduces to the computer network basics. Local, metropolian and wide area networks explained. Point-to-point, bus and star network topologies. Unicast, multicast and broadcast transmissions. What is a broadcast storm and how to split a broadcast domain. Virtual local networks (VLANs), VLAN tags, VLAN trunks and multilayer switches are also explained.
Bluetooth is an open standard for short-range
digital radio to interconnect a variety of devices Cell
phones, PDA, notebook computers, modems,
cordless phones, pagers, laptop computers, printers,
cameras by developing a single-chip, low-cost,
radio-based wireless network technology.
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
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Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
Dev Dives: Train smarter, not harder – active learning and UiPath LLMs for do...UiPathCommunity
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See how to accelerate model training and optimize model performance with active learning
Learn about the latest enhancements to out-of-the-box document processing – with little to no training required
Get an exclusive demo of the new family of UiPath LLMs – GenAI models specialized for processing different types of documents and messages
This is a hands-on session specifically designed for automation developers and AI enthusiasts seeking to enhance their knowledge in leveraging the latest intelligent document processing capabilities offered by UiPath.
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👨🏫 Andras Palfi, Senior Product Manager, UiPath
👩🏫 Lenka Dulovicova, Product Program Manager, UiPath
3. LAN (Local Area Networks)
A LAN is a computer network that covers a small area (home, office,
building, campus)
o a few kilometers
LANs have higher data rates (10Mbps to 10Gbps) as compared to
WANs
LANs (usually) do not involve leased lines; cabling and equipments belong
to the LAN owner.
A LAN consists of
o Shared transmission medium
• now so valid today due to switched LANs
o regulations for orderly access to the medium
o set of hardware and software for the interfacing devices
4. WORKING OF LAN
LAN usually broadcast their message to all hosts on
that LAN.
This hosts shares a single transmission media.
This broadcast network can be a static or dynamic
method.
In this static method each host is given a fixed time
slides to send the information. This is the most popular
method used.
5. In the dynamic method a host can send a frame any time.
If the two hosts send a frame at the same time the two
frames could collide with each other.
Dynamic method can be further sub-divided in 2
categories:
1. Centralized
a. Carrier Sensing
b. Token Passing
2. Decentralized: Protocols are used to implement media
access control.
6. LAN Protocol Architecture
Corresponds to lower two layers of OSI model
o But mostly LANs do not follow OSI model
Current LANs are most likely to be based on Ethernet protocols developed
by IEEE 802 committee
IEEE 802 reference model
o Logical link control (LLC)
o Media access control (MAC)
o Physical
8. LAN Interconnection
Traditional LAN interconnection devices
Repeater – it operates at OSI layer 1 and transmits data bits over a physical
medium.
Bridge – it operates at OSI layer 2 and is commonly used to connect similar
LAN segments.
Switch – it operates at OSI layer 2 or layer 3 and is used to interconnect
multiple similar or dissimilar LANs.
Router – it operates at OSI layer 3. A router is used to interconnect individual
networks whose sizes vary from very small to very large. Routers may be
categorized into backbone router (or core router), border router and access
router depending on their role in the network.
11. Advantages
Long Distances Possible
10 Base-5 allows distances up to 500 meters (1650 feet). This
makes it very useful as a "backbone" technology for wiring
together multiple locations within a building without the use of
repeaters
Noise Immunity
Since 10 Base-5 uses a very heavily shielded cable, it can be used
in electrically noisy environments which can cause other network
types to fail.
Conceptually Simple
Since all devices on a 10 Base-5 network are simply chained
together on a common coaxial cable, it is a simple matter to plan
the routing of the cable
12. Disadvantages
Inflexible
10 Base-5 networks do not lend themselves well to installations
where the setup of the network will change much after the initial
installation. It can be very difficult to add or move a node once it
is connected to the coaxial cable.
Fault Intolerant
Since 10 Base-5 uses a common physical cable to interconnect all
the nodes, the failure of any part of the coaxial cable or any node
has the ability to cause the collapse of the entire network.
15. Bluetooth Birth
The Name –Bluetooth?
The name is
attributed to
Harald Bluetooth
was king of
Denmark around
the turn of the last
millennium.
Created by Matt Romita and Mohammed Hasham for BCS 312 and used in BCS 555
16. What Is Bluetooth?
• Designed to be used to connect both mobile devices and
peripherals that currently require a wire.
• “USB without wires”
• Short range wireless radio
technology.
- operate range of 100
meters.
Created by Matt Romita and Mohammed Hasham for BCS 312 and used in BCS 555
17. Who Started Bluetooth?
Ericsson Mobile Communication
• Bluetooth Special Interest Group (SIG)
-5 founding members
-Ericsson, Nokia, IBM, Intel & Toshiba
• Promoter’s Group
- 3COM, Lucent, Microsoft, Motorola
• Now over 1900 members
Created by Matt Romita and Mohammed Hasham for BCS 312 and used in BCS 555
18. How Does It Work?
• Bluetooth is a standard
for tiny, radio frequency
chips that can be plugged
into your devices
• These chips were designed to
take all of the information that
your wires normally send, and
transmit it at a special
frequency to a receiver
Bluetooth chip.
Created by Matt Romita and Mohammed Hasham for BCS 312 and used in BCS 555
19. Bluetooth @ Home
er
gita
lC ame
ra
NO WIRES
Computer
Scann
Di
Inkjet
Printer
xDSL
Access Point
Player
MP3
Home Audio System PDA Cordless Phone
Cell Phone Base Station
Created by Matt Romita and Mohammed Hasham for BCS 312 and used in BCS 555
20. Bluetooth Products 1
• Bluetooth-enabled
PC Card
Created by Matt Romita and Mohammed Hasham for BCS 312 and used in BCS 555
21. Bluetooth Products 2
• Bluetooth-enabled
PDA
Created by Matt Romita and Mohammed Hasham for BCS 312 and used in BCS 555
22. Bluetooth Products 3
• Bluetooth-enabled
Cell Phone
Created by Matt Romita and Mohammed Hasham for BCS 312 and used in BCS 555
23. Bluetooth Products 4
• Bluetooth-enabled
Head Set
Created by Matt Romita and Mohammed Hasham for BCS 312 and used in BCS 555
24. Advantages (+)
• Wireless (No Cables)
• No Setup Needed
• Low Power Consumption (1 Milliwat)
• Industry Wide Support
Created by Matt Romita and Mohammed Hasham for BCS 312 and used in BCS 555
25. Disadvantages (-)
• Short range (10 meters)
• Small throughput rates
- Data Rate 1.0 Mbps
• Mostly for personal use
(PANs)
• Fairly Expensive
Created by Matt Romita and Mohammed Hasham for BCS 312 and used in BCS 555
30. INTRODUCTION
Data communications system
Alternates wired LAN
Transmits and receives data over the air
Minimize the need for wired connections
Become more popular in general-purpose
alternative of business customers.
Benefited several industries in productivity
and mobility
33. HOW IT WORKS
Use electromagnetic airwaves to
communicate information
Data imposed on radio carrier (radio wave)
RF electromagnetic wave can easily
pass through ordinary wall, it needs to
implement with heavy concrete or metal
screening.
34. WIRELESS TECHNOLOGY
Satellite-Based System
– Geosynchronous Earth Orbiting (GEO)
– Low Earth Orbiting (LEO)
Land-Based Network Access System
– Wireless WAN
– Wireless LAN
36. WIRELESS LAN
Wireless LAN Topology
– 2 main components
Access Points
Adapters
– Roaming
Wireless LAN Technology
– Types
– Standard
– Configuration
37. ACCESS POINTS
Connects to the wired network
single access point can support a small
group of users within a range of several
hundred feet
Wireless Clients Connected to LAN
via Access Point
39. INFRARED (IR)
TECHNOLOGY
Little used in commercial wireless LANs
Use very high frequencies
Inexpensive, but provide very limited
range (3ft)
Typically used for personal area
networks
Used only to implement fixed
subnetworks
43. Star Topology:
• The star network configuration is the most popular
physical topology
• In a star configuration, all computers or stations are
wired directly to a central location:
– Concentrator (a.k.a. hub)
– Multistation Access Unit (MAU)
• A data signal from any station goes directly to this
central device, which transmits the signal according
to the established network access method for the
type of network
46. Star topology advantages:
– A break in one cable does not affect all other
stations as it does in bus technologies
– Problems are easier to locate because symptoms
often point to one station
– The second-easiest topology to design and install
– Does not require manual termination
• Instead the media is terminated in the station at the
transceiver on the NIC and in the hub or MAU
47. Star topology disadvantages:
– Hubs, which are required for a star topology, are
more expensive than bus connectors
– A failure at the hub can affect the entire
configuration and all connected stations
– Uses more cable than bus topologies