The document provides an introduction to computer networks and the internet. It discusses key topics such as:
- What the internet is and how it allows global communication and information sharing through interconnected networks using protocols like IP.
- Popular internet applications include the world wide web, email, file transfer, and streaming.
- The differences between "internet" and "Internet" and what is needed to visit websites, including having a machine with TCP/IP, a gateway, DNS server, browser, and URL or IP address.
- Other topics covered include IP addresses, domains, URLs, internet browsers, creating basic web pages, and protecting computers from viruses and spyware.
Here I covered the cores of Apache and also discuss each and every core. Virtual host, resistance server process some protocols like HTTP, SMTP, DNS FTP, are also be highlighted.
Focus on some installing part of apache.
Here I covered the cores of Apache and also discuss each and every core. Virtual host, resistance server process some protocols like HTTP, SMTP, DNS FTP, are also be highlighted.
Focus on some installing part of apache.
Spotify: Horizontal Scalability for Great SuccessNick Barkas
Talk for EuroPython 2011 by Nick Barkas from Spotify. Discussion of some things to consider when building a scalable network service, including details about how we handle the challenges that come along with this at Spotify
The presentation is about v6-only network deployments using NAT64+DNS64 and not necessarily suggests eliminating dual stack.
The major focus of the talk is to discuss about the value of v6-only deployments and an example of a simple deployment using jool and bind9 on ubuntu server.
This presentation is a part of the COP2271C college level course taught at the Florida Polytechnic University located in Lakeland Florida. The purpose of this course is to introduce Freshmen students to both the process of software development and to the Python language.
The course is one semester in length and meets for 2 hours twice a week. The Instructor is Dr. Jim Anderson.
A video of Dr. Anderson using these slides is available on YouTube at:
https://www.youtube.com/watch?v=N6cQRG5oEAY
Http2 is here! And why the web needs itIndicThreads
Presented at the IndicThreads.com Software Development Conference 2016 held in Pune, India. More at http://www.IndicThreads.com and http://Pune16.IndicThreads.com
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Building the Internet of Things with Thingsquare and Contiki - day 1, part 2Adam Dunkels
How to build the Internet of Things - what is an Internet of things device and how do we connect it? This is the second Thingsquare IoT workshop slide deck.
Alfresco Backup and Recovery Tool: a real world backup solution for AlfrescoToni de la Fuente
Presentation used in the Alfresco Summit 2014 (both Barcelona and Boston).
If you want to see the demo visit: https://www.youtube.com/watch?v=i0K2Y_6JH0A
White Paper and presentation video can be found here: http://summit.alfresco.com/boston/sessions/alfresco-backup-and-recovery-tool-real-world-backup-solution
TTL Alfresco Product Security and Best Practices 2017Toni de la Fuente
Slide deck used during Tech Talk Live #110 in October 2017. Phil Meadows and myself discussed about Alfresco products security and I went through Alfresco CS security best practices.
HTTP 1.1, which is the backbone of pretty much everything we’ve been using on the Internet, has been around for over 15 years. Recently the HTTP 2.0 specification has been completed and gradually application servers will start supporting it. It does make one wonder though: why change if something has been working for so long. In this talk we’ll examine the shortcomings of HTTP 1.1 and how 2.0 intends to address those. We’ll see what we need to know and how it’s going to affect our existing applications, and future ones.
2009 SMB Disaster Preparedness Survey Global ResultsSymantec
In this year’s annual Disaster Recovery Research, Symantec found that organizations’ IT staff responsible for disaster recovery are under increased pressures caused by high downtime costs, stringent IT service level requirements and budgets that are expected to remain flat over the next few years. Although IT professionals have been largely able to rise to these challenges and are doing more with less, disaster recovery testing increasingly impacts customers and revenue, and one in four tests fail. In addition, incorporating virtualization into disaster recovery plans is still a major challenge for organizations. Due to this and other factors, executives are more involved in disaster recovery initiatives.
Spotify: Horizontal Scalability for Great SuccessNick Barkas
Talk for EuroPython 2011 by Nick Barkas from Spotify. Discussion of some things to consider when building a scalable network service, including details about how we handle the challenges that come along with this at Spotify
The presentation is about v6-only network deployments using NAT64+DNS64 and not necessarily suggests eliminating dual stack.
The major focus of the talk is to discuss about the value of v6-only deployments and an example of a simple deployment using jool and bind9 on ubuntu server.
This presentation is a part of the COP2271C college level course taught at the Florida Polytechnic University located in Lakeland Florida. The purpose of this course is to introduce Freshmen students to both the process of software development and to the Python language.
The course is one semester in length and meets for 2 hours twice a week. The Instructor is Dr. Jim Anderson.
A video of Dr. Anderson using these slides is available on YouTube at:
https://www.youtube.com/watch?v=N6cQRG5oEAY
Http2 is here! And why the web needs itIndicThreads
Presented at the IndicThreads.com Software Development Conference 2016 held in Pune, India. More at http://www.IndicThreads.com and http://Pune16.IndicThreads.com
--
Building the Internet of Things with Thingsquare and Contiki - day 1, part 2Adam Dunkels
How to build the Internet of Things - what is an Internet of things device and how do we connect it? This is the second Thingsquare IoT workshop slide deck.
Alfresco Backup and Recovery Tool: a real world backup solution for AlfrescoToni de la Fuente
Presentation used in the Alfresco Summit 2014 (both Barcelona and Boston).
If you want to see the demo visit: https://www.youtube.com/watch?v=i0K2Y_6JH0A
White Paper and presentation video can be found here: http://summit.alfresco.com/boston/sessions/alfresco-backup-and-recovery-tool-real-world-backup-solution
TTL Alfresco Product Security and Best Practices 2017Toni de la Fuente
Slide deck used during Tech Talk Live #110 in October 2017. Phil Meadows and myself discussed about Alfresco products security and I went through Alfresco CS security best practices.
HTTP 1.1, which is the backbone of pretty much everything we’ve been using on the Internet, has been around for over 15 years. Recently the HTTP 2.0 specification has been completed and gradually application servers will start supporting it. It does make one wonder though: why change if something has been working for so long. In this talk we’ll examine the shortcomings of HTTP 1.1 and how 2.0 intends to address those. We’ll see what we need to know and how it’s going to affect our existing applications, and future ones.
2009 SMB Disaster Preparedness Survey Global ResultsSymantec
In this year’s annual Disaster Recovery Research, Symantec found that organizations’ IT staff responsible for disaster recovery are under increased pressures caused by high downtime costs, stringent IT service level requirements and budgets that are expected to remain flat over the next few years. Although IT professionals have been largely able to rise to these challenges and are doing more with less, disaster recovery testing increasingly impacts customers and revenue, and one in four tests fail. In addition, incorporating virtualization into disaster recovery plans is still a major challenge for organizations. Due to this and other factors, executives are more involved in disaster recovery initiatives.
Symantec announced it has signed a definitive agreement to acquire privately-held Clearwell Systems, Inc., a recognized leader in the eDiscovery market. The acquisition of Clearwell will bring together the industry's leading eDiscovery, archiving and backup offerings to provide customers one of the most comprehensive information management solutions available.
Symantec Intelligence Report November 2014Symantec
There was a significant jump in emails containing malicious URLs during the month of November, where 41 percent of emailborne malware contained a link to a malicious or compromised website. The last time we saw this level of activity was back in August of 2013. Since then, URL malware had been present in 3 to 16 percent of malicious emails each month, until this recent surge.
We have reason to believe that the Cutwail botnet is responsible for some of this increase. However, this botnet only makes up 3.7 percent of total botnet activity tracked in November. Kelihos and Gamut appear to be in the number one and two positions, comprising 19.2 and 18.8 percent respectively.
The topics in the campaigns we’ve seen so far include fake telecom billing notices, as well as fax and voicemail spam, and government levied fines. The URLs in the first two campaigns appear to be downloaders that will install further malware on a compromised computer, while the third campaign leads to fake captcha sites hosting crypto-ransomware.
Ransomware as a whole continues to decline as the year progresses. However, the amount of crypto-ransomware seen continues to comprise a larger portion of this type of malware. This particularly aggressive form of ransomware made up 38 percent of all ransomware in the month of November.
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2. Internet
• Interconnection of networks worldwide
• Allows communication and sharing of
information between connected systems
• Uses Internet Protocol
• Popular applications
– World Wide Web
– E-mail
– File transfer & sharing
– Voice and video streaming
3. Any difference between
‘Internet’ and ‘internet’?
• YES!
• internet is interconnection of networks
• Internet with capital 'I' refers to the internet as in
the world wide web
• Confused? Read again!
4. What is needed to visit a
website in the Internet?
• A machine installed with TCP/IP protocol
• Gateway / Router / Proxy server
• DNS server
• A browser program
• The URL / IP address of the website
5. TCP/IP
• TCP and IP are communication protocols for the
Internet
• Try this
– Check the network properties of your machine to find
out whether your machine has TCP/IP installed. Write
the IP address of your machine. You can use ‘ipconfig’
command to find your machine’s IP address.
– Use the ‘ping’ command to check whether you have
connectivity with your friends’ machines.
– Type ‘ping/?’ in the command prompt to view the
options of this command. If you want to continuously
ping, what option will you use?
6. Internet Protocol
• Every computer that communicates on a network
needs its own IP address
• Static and Dynamic
– Static addresses are permanently configured for a
machine
– Dynamic addresses are given by DHCP servers
– Question: When you are connected to Internet
through your home Streamyx, what type of IP are
you getting: static or dynamic? Why?
• Public and private
– Public IPs can be seen on the Internet
– Private IPs can only be used within a broadcast
domain
• ranges associated with addresses 10.0.0.0,
172.168.0.0, and 192.168.0.0 through 192.168.255.0.
• Question: what type of IP is your machine’s? Private or
public? Is it static or dynamic?
7. IPv4 and IPv6
• Two standards of IP addresses being used today
• IPv4
– has 4 billion addresses but they are not enough for
the growing number of machines connected to the
Internet
• IPv6
– has 2128 addresses=3.4x1038 addresses
– ISPs are moving into implementing IPv6 addresses
because of its many advantageous features
• Fact finding: Find the role of National Advanced
IPv6 Center in the implementation of IPv6
technology in Malaysia. Why need a National
organisation to implement IPv6 addresses? Visit
http://www.nav6.org to find your answers. (15
minutes)
8. Domain name
• The name of a computer on the Internet
• The domain name service (DNS) converts domain
names to IP addresses
• Who runs the DNS?
– Millions and millions of servers
– DNS database is the biggest database in the world
• Some Top Level Domains - .com, .org, .net
• nslookup is a command that you can use to check
whether a domain name and its IP are available in
a DNS server
9. • Try this
– Find whether the domain name nav6.org is
available in OpenDNS and 202.188.0.133
servers
– How to do this?
• Search the OpenDNS IP from the Internet and
use command nslookup – OpenDNS-IP nav6.org
• Now try the same command again with DNS IP
202.188.0.133
• See the results. Is the name found in the DNS
servers?
10. URL
• Uniform Resource Locator
– the global address of documents and other resources on the World
Wide Web
– The first part of the address is called a protocol identifier and it
indicates what protocol to use
– The second part is called a resource name and it specifies the IP
address or the domain name where the resource is located
– For example, the two URLs below point to two different files at the
domain nav6.org. The first specifies an executable file that should
be fetched using the FTP protocol; the second specifies a Web
page that should be fetched using the HTTP protocol:
» ftp://www.nav6.org/sample.exe
» http://www.nav6.org/v3/index.html
11. Internet Browser
• A program used to view web pages
• Question: Can you name some popular
internet browsers?
12. A web page
•Is created using HTML tags.
Try this: Open Notepad and type the tags and statements
below.
Save it with extension .htm or .html. Then open it with an
Internet browser.
<html>
<head></head>
<title>This is my title</title>
<body>
<H1>Hello world</H1>
<H2>Hello world</H2>
<H3>Hello world</H3>
</body>
</html>
13. Creating a web page using Microsoft Word
• You can create a web page easily using
Microsoft Word.
• You can create a page by just creating a
document and saving it as a web page.
• If you have never tried it, try it!
14. Protecting your PC
• What should you do?
– Install antivirus – Try this by downloading a free
antivirus like AVG or Avira antivirus and installing
them in your PC
– Enable your PC firewall – Try this
– Update your operating system regularly – Try this by
using Windows Update
– Install a reliable anti-spyware – Try this by installing
Windows Defender. You can also download and
install Search & Destroy Spybot
• What else should you do?
– Don’t accept applications from the websites if you not
sure of their contents
– Don’t open attachments from your emails if they look
suspicious