Internet Protocols

The Internet Protocol (IP) is the principal communications protocol in the Internet protocol suite for relaying datagrams across network boundaries, organized in abstraction layers, traditionally called "Link," "Internet," "Transport" and "Application”. Its routing function enables internetworking, and essentially establishes the Internet. IP defines packet structures that encapsulate the data to be delivered. It also defines addressing methods that are used to label the datagram with source and destination information.

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I need some help in understanding what is the "DNS"? What is it exactly? Do I need to have it? If so which one do you recommend?

Thank you,

Basem Khawaja
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Become a CompTIA Certified Healthcare IT Tech
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Become a CompTIA Certified Healthcare IT Tech

This course will help prep you to earn the CompTIA Healthcare IT Technician certification showing that you have the knowledge and skills needed to succeed in installing, managing, and troubleshooting IT systems in medical and clinical settings.

I am facing strange problem in accessing websites . Some Sites are not opening in my laptop like hackforums.net and many others  sites. But same sites are accessible when I install VMWARE Machine in same laptop .Kindly guide me what is the problem this is .
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Hello, I am wondering if there are example diagrams of how internet cookies work from one website which has advertising banners and when clicked the process of redirection?
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Problem:
No one inside the office has internet access.

I'm working with a Cisco 1900 series router,  Cisco 5520 ASA(firewall) and Dell Powerconnect 6224 switches.

Service has been confirmed up to the router.  The line out of the router goes into the Cisco 5520 ASA (firewall).  The line out the firewall goes into one of the Powerconnect Switches which are stacked (configured as master/slave (unit 1 & 2).

I can ping and connect to the switch from the Domain Controller but when I ping the Cisco 5520 (firewall) the reply I get is "Destination Host is Unreachable".  I get the same reply from workstations.

When the problem began one of the PC 6224 switches would not come on so the cables plugged into it were moved to the other switch.  Shortly after the switch that wasn't working came back on.  The cables were then randomly moved back into the switch.  I'm not sure if certain cables were designated for certain ports.

How can I get things working again.

Any help would be greatly appreciated.

Thanks in advance
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I have a gaming computer which doesn't have wifi capabilities. I can't use an ethernet cable because the router is in another room. An option I was looking at is powerline networking. I only did a brief Google search on this.

  • Can someone explain how exactly powerline networking works?
  • How safe is it in terms of surges and possible fires? I have a lot of stuff plugged in, having a gaming rig and all, but they're all on a surge protector.
  • I hear it's better than wifi but not better than ethernet. Is this true?
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I am seeking a program that will constantly monitor active internet access for me. I need it to check at programmable intervals to make sure the net is available. I would want to set mine for a check every minute or so. I am having difficulty with my isp going off for up to two minutes several times a day without warning. I need the program to be free or shareware. There are MANY available but would prefer  a personal recommendation from an Expert that has had personal success with the program personally. Can any Expert recommend one to me?
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Ping google.com is working
Ping 8.8.8.8 is not (request timeout)
Ping experts-exchange.com is working
Ping dropbox.com is not (request timeout)

Any Idea where to start checking
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I have a 6 year old Lenovo Ideapad P500, 6 gigs of RAM running Windows 10.  I have a dedicated gigabit internet connection (1000 down/1000 up).  I connected the laptop via CAT6 cable directly to my modem.  However, when I speed test it, I am only getting around 90 down/90 up. I have 2 younger computers on the modem directly connected and they speed test perfectly. I know it is old, but is that fact holding it down?  I have only the essentials installed on it, so it is pretty clean.  Anti-virus sweeps show it to be clean as well.  What other checks/tests/troubleshooting can I perform?
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trying to reach to the companyname.com, using ping companyname.com

This domain is hosted by goddady.com

it was hosted my email myname@companyname.com
now I can send but cannot receive any more.  bouncing back..
Cannot resolve using nslookup either.
email hosted outlook.office365.com

The error is "Domain unavailable"
The domain is not expired (it expires in 2019)
however non-pingable and cannot resolve..
What could be an issue?  Please help troubleshoot..
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the internet here will go out for 5 - 10 seconds several times a day.

Wondering if there's anything you can see that's a problem or just a loose connection on the pole somewhere (and how likely will they find it?).

I was using a new netgear docsis 3 modem and having this problem.
Got a Cablevision supplied motorola docsis 2 modem and put that in and problem continues
theres only the cable modem on the coax. No TVs.
Connections I can get to - both sides of the lightning arrester / grounding tap outside and the cable connection onto the modem are tight and cablevision installed connectors.
i set up to ping 1.1.1.1 -t.  It'll go on for a while with time of 10 - 15 ms.  then it'll just stop for 5 - 10 seconds.  Then start back up with 10 - 15ms.
I was getting similar error messages on the netgear router, now these messages.  I'd think any systemic / DHCP address problems would have the connection be out completely, not for 5 - 10 seconds every once in a while. But are these errors indicative of other issues?

I called cablevision and they poo pood their old surfboard modem. So I put the netgear back in the network.  Got the errors in the last picture.  And internet went out for minutes and I rebooted the modem and it came back up.

There's a picture below of the signals at the netgear and it has a 6db attenuator in it. the rep said signals are ok / better with the 6db in there than without it.  But the uncorrected errors?  the outage needing a reboot?  And the …
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CompTIA Network+
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CompTIA Network+

Prepare for the CompTIA Network+ exam by learning how to troubleshoot, configure, and manage both wired and wireless networks.

Hi, My SEO team is having me create directories for certain keywords, like /affordable-meal-delivery/, so that the URL is mywebpage.com/affordable-meal-delivery/

The only way I know to do this is to create the directory and then have an index.html inside the directory. But I don't like having so many pages called index.html, for one thing I am afraid of overwriting one to another.

This site is able to do it without an index.html: www.freshnlean.com/gluten-free-meal-delivery/  - if I add index.html to that, it goes to a page not found.

We are on an Apache server. So it looks to me like this:



But I have ten or so of those directories with an index.html in each. How can I do this without the index.html. Ideally, I would want the page inside the directory to be affordable-meal-delivery.html. Can I use an htaccess file to do this?

Thanks.
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I did a speed test from several speed test sites for my 1 gig Internet circuit and my download and upload are so different. The upload seems fine but the download is so off. It never passes 250Mbps. I have another 300 Mbps with another ISP and when I tested it with the speedtest sites, the download and upload are almost the same, around 250Mbps.
The tech was onsite and tested with his test set and he said that he gets around 900Mbps upload and download.
How do I explain this? Can I trust the 1G circuit provider? What is the explanation for the speedtest sites reported big differences between download and upload.

Any thoughts? Thanks
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Internet through Cable line or Satellite

I have read online that there are fiber cables ran through the Oceans to reach other continents in order to provide internet connection.
I have also read that internet connection is provided through Satellites somewhere in the Orbit, and there is no need to run cables from one end of the globe to another.

I am not sure which approach is used to have people in the world connect to Internet.

Any Expert to shade some lights on this ?

Thanks
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Simple way to monitor the internet connection to a remote server.
I would like to monitor the internet connection to several remote servers and then be notifed via email if the servers are offline.
Or alternatively. I would like to monitor 1 static IP to see if it is active on the internet (which should tell me if there is internet at the remote site).. and send me an email when
that IP loses internet ...
Is there a way to do this?
If yes, what do you suggest?
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When you type in experts-exchange.com in a web browser, theres all the work of resolving the name into an ip address and then your packets are sent from your computer to the EE web server and vice versa, going through routers around the web, right?

Contrast that with an email?  I was explaining to someone that large attachments in an email might cause the email to not be delivered as it routes its way through the web. Then I wondered... is the email actually going through  mail servers on the web and being reforwarded? Or just routers (on the backbone?). If it's just routers, do they actually care how big the total email is? It's just a lot of packets being sent in the same direction.

ie - is there really a limit to an attachment size limit in email OTHER THAN at the sender or receiver email server?  Yes, the sender server or receiving server can set limits to the size of the attachment.  But after resolving the MX record and sending to the receiving server.... what could get in the way?

THANKS!
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When click on an email link in Internet Explorer, it does not open the default email program, but a new page opens up asking to add an email account instead.   Can this be fixed so that the default email program is opened?
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can somebody tell me the steps when one browse the internet, how we browse the internet

like how computer talks so we yahoo or any other website

do we contact root hints server or how isp DNS server works?
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Dumb question.  Do the companies have to register their domains based on their country code?  For example, if my business in Canada, do I have to register as company.ca ?  What prevents me to register as .com?
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I have been doing some research into setting up redundant ISPs on the PANs (Palo Alto firewalls), and it seems that if we don't want to run BGP for that site, the best alternative seems to be PBF.  Am I on the right track with that?  Are there other alternatives?
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Starting with Angular 5
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Starting with Angular 5

Learn the essential features and functions of the popular JavaScript framework for building mobile, desktop and web applications.

Hi,

We have a Windows 10 PC connected via a wired ethernet connection to our router.

To test the stability of this ethernet connection, we have run a continuous ping test via command line.

One of the results back have displayed that 1 out of 4 packets were lost (25% loss).

This test was initially ran to test for disconnects or problems with the wired internet connection.

What is the significance of the ping test and how does the 25% loss reflect on wired internet connection for this PC?

Thanks,
Robbie
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Hi all

I have1Cisco ASA 5525x, 1 3900 Router and 2 Internet connections. what is the best deployment method to supported what I have.



1. Should both Internet connections connect to Firewall Interfaces ?

2. Should  Both Internet connections connect to the Internet router ?

Any advice will be much appreciated.
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Issue #1: I currently have 1 gig Internet speed (service) from my local cable provider BlueStream.  For months I have had an annoying intermittent problem with their service.  There are times when the service will completely go down multiple times in one day, but each time it goes down, it may be for only 1 or 2 minutes and then it right back up as if nothing had happened.  The modem did NOT reboot, perhaps the indicator light may go out and back on, but that's it.  This happens about 5 or 6 days per month, sometimes more.  

Issue #2: The second issue is when I go to ANY random site, the web page will NOT load properly or not load at all.  However, as soon as I hit F5 to reload it pops right on in a millisecond.  I get this on 3 different browsers, Edge, Firefox and Chrome.  I have tested my connection MANY times using http://www.dslreports.com/speedtest and usually the tests results are very good to excellent. BlueStream has been out to my home 5 different times for these issues.  I am on my 4th modem and two different models.  They have also rewired the outside lines and checked most everything outside of my house.  Nothing has fixed this issue.  

In contrast, I disconnected my ethernet connection and reconnected to my internet hot spot on my iphone and at only 8MB/s I was loading pages faster with no problems as I outlined in issue #2.

By pure luck, the last time they were out they actually SAW this problem "live" for the first time (Issue #2) and saw it happen.  …
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Hi everyone, i was connected to a VPN for a few days and everything works fine. But yesterday, from overnight, the client Junos Pulse Secure starts giving me the error 1329 while i was trying to reach a connection to the server.

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I work with this VPN in different computers but it just throw me that error in this one ( which, by the way, is the last one i start using).

I'll be grateful if anyone can bring me some light over this.

Thanks
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Not getting internet on laptop

Error is dns probe finished no internet

Windows diagnostics not helping

How to fix this
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Ping: 34 ms
Download: 16.46 Mbps
Upload: 16.63

Thanks.
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Internet Protocols

The Internet Protocol (IP) is the principal communications protocol in the Internet protocol suite for relaying datagrams across network boundaries, organized in abstraction layers, traditionally called "Link," "Internet," "Transport" and "Application”. Its routing function enables internetworking, and essentially establishes the Internet. IP defines packet structures that encapsulate the data to be delivered. It also defines addressing methods that are used to label the datagram with source and destination information.

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Internet Protocols
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