What is an SLA?

A Service Level Agreement (SLA) is a document that details the expected level of service guaranteed by a vendor or product. This document generally sets out metrics such as uptime expectations and any payoffs if these levels are not met.

For example, if a provider advertises an uptime of 99.9% and exceeds 43 minutes and 50 seconds of service downtime, technically the SLA has been breached and the customer may be entitled to some type of remuneration depending on the agreement.

What do we want SLAs for?

A Service Level Agreement (SLA) specifies the quality of a service. It is a way of defining the limit of failures or times in which the response to a service is measured. Each service measures its quality in a different way, but in all cases it refers to times, and therefore it can be measured.

For example, if you worked in a restaurant, you would define your customer service SLA with several parameters:

• Maximum time since a customer sits at the table and is served by a waiter.
• Maximum time since you order the drink and it is served to you.
• Maximum time since requesting the bill and paying.

Suppose that in our restaurant, we consider that the most important thing is the initial attention, and that no more than 60 seconds can go by, from when you sit down to when you are served. If we had a fully sensorized business with IoT technology, we could measure the time from when the customer sits at a table until a waiter approaches the table.

That way, we could measure the number of times each waiter manages to serve a customer in the established time. The way to do it can be more or less simple, but let’s keep it simple, suppose that every time they do it in less than 60 seconds they comply and when they do not make it, they do not comply. So if out of ten clients they serve in an hour, they fail only with two, they would be 80% compliant. We could make the average of their entire work day and thus easily compare different employees to find out which one has more “quality” in the metric of “serving a customer when they sit down.”

If we use a monitoring system, we could notify their manager every time that the overall quality of the service drops below 80% and by generating automatic reports, we could each month reward those with the best service compliance percentage and take measures (or fire) for those who are doing it worst.

One of the most important functions of monitoring systems is to measure. And measuring service compliance is essential if we care about quality. Whether we are on the provider side or on the client side.

If you are paying for a service, wouldn’t you like to check that you are actually getting what you pay for?

Sometimes we do well not to trust the measurements of others, and it is necessary to check it for “ourselves.” For this, monitoring tools such as Pandora FMS are essential.

What is the «uptime» or activity time?

Uptime is the amount of time that a service is available and operational. It is generally the most important metric for a website, online service, or web-based provider. Sometimes uptime is mistaken with SLA, but uptime is nothing more than a very common metric in online services that is used to measure SLAs, not an SLA, which as we have seen before is something much broader.

The trade-off is downtime – the amount of time a service is unavailable.

Uptime is usually expressed as a percentage, such as “99.9%”, over a specified period of time (usually one month). For example, an uptime of 99.9% equals 43 minutes and 50 seconds of inactivity.

What are the typical metrics of a supplier?

Those that are agreed between the supplier and the client. Each service will have its own metrics and indicators. Thus, in our Monitoring as a Service (MAAS) we can establish several parameters to be measured, among others, let’s see some of them to better understand how to «measure the service quality» through SLA:

• Minimum response time to a new incident, 1 hr in standard service.
• Critical incident resolution time: 6 hours in standard service.
• Service availability time, 99.932% in the standard service.

When we talk about a time percentage, it generally refers to the annual calculation, so 99.932% corresponds to a total of 5h 57m 38s of service shutdown in a year. We can use our SLA calculator (below to test other percentages).

On the contrary, 1hr would be the inverse calculation, and for this we can use online tools such as uptime.is. By using it we will get that six hours would correspond to:

• Weekly reporting: 99.405 %
• Monthly reporting: 99.863 %
• Quarterly reporting: 99.954 %
• Yearly reporting: 99.989 %

Similarly to the initial waiter example, we can measure compliance with a support SLA by measuring the sum of several factors, if all are met, we are meeting the SLA, otherwise we’re not. This is how Integria IMS measures it, the helpdesk component integrated in Pandora FMS. Pandora FMS clients use Integria for support, and thanks to it we can ensure that we attend to client requests on time.

How to calculate the service SLA time?

Use our online calculator to calculate a service downtime. For example, test 99.99% to see the maximum downtime for a day, a month, or the entire year.

How can Pandora FMS help with SLAs?

Pandora FMS has different tools to exhaustively control the SLAs of your client/supplier. You have SLA reports segmented by hours, days or weeks. That way you can visually assess where the defaults are.

This is an example of an SLA report in a custom time range (one month) with bands by ranges of a few minutes.

There are reports prepared to show the case of information sources with backup so that you can find out the availability of the service from the customer’s point of view and from the internal point of view:

This is an example of a monthly SLA view with detail by hours and days:

This is an example of a monthly SLA report view with a weekly view and daily detail:

This is an example of an SLA report view by months, with simple views by days:

Service monitoring

One of the most advanced functions of Pandora FMS is monitoring services with Pandora FMS. It is used to continuously monitor the status of a service, which, as we have seen at the beginning, is made up of a set of indicators or metrics. This service often has a series of dependencies and weightings (there are things more important than others) and all services have a certain tolerance or margin, especially if they are made up of many elements and some of these are redundant.

The best example is a cluster, where if you have ten servers, you know that the system works perfectly with seven of them. So the service as such can be operational with one, two or up to three machines failing.

In other cases, a service may have non-critical elements, which are part of the service and that we want to control, even if the service is not affected:

One of the advantages of service monitoring is that you can easily get the route to failure, literally being able to find the needle in the haystack. When you talk about technology, the source of a problem can be somewhat tiny compared to the amount of data you receive. Services help us determine the source of the problem and isolate ourselves from informational noise. They also allow to monitor the degree of service compliance in real time and take action before the quality of the service for a customer is affected.

Is Cybersecurity Awareness Month the event of the year?

Welcome back to the incredible and majestic Pandora FMS blog. In today’s post, we are going to deal with an event belonging to the month of October, that depressing month in which we become aware of fall, it is colder and someone keeps cutting short our daylight hours. If April is the month of flowers and November the month of the male mustache for testicular cancer, October is the Cybersecurity Awareness Month.

What is Cybersecurity Awareness Month?

Cybersecurity Awareness Month, which is commemorated every October, was created between the United States government and national industry to ensure that everyone had the necessary resources to stay safe and secure online.

Since its inception, under the supervision of the US Department of Homeland Security and the National Cyber Security Alliance, Cybersecurity Awareness Month has grown stronger and more widespread, reaching out to millions of users and businesses, and all types of corporations and institutions. Today, in 2021, it continues to make an impact, and not only in its country of origin, it already does around the world because, who would not join the cause of feeling more protected in these times we live in?

Cybersecurity Awareness Month: Origins

As we’ve explained, the National Cyber Security Alliance and the US Department of Homeland Security launched Cybersecurity Awareness Month in October as a shared effort to help Americans stay safe online. And they did it a few of years ago, at least all those that distance us from October 2004.

When a baby starts to walk, the first steps are short and simple. So were the early Cybersecurity Awareness Month awareness efforts. Most of them focused on giving recommendations on how to update the antivirus, at least twice a year. But little by little they increased their ambitions, their reach and their participation. For example, launching complex campaigns in the industry, involving clients, NGOs and even university campuses.

The organizers made it clear in these years that responsibility for cybersecurity problems is fully shared. From large companies to small users with their battered laptops, all of us must protect our digital treasures and always keep them under supervision.

The European Cybersecurity Month (ECSM)

What is European Cybersecurity Month? The European Cybersecurity Month works, like the American Cybersecurity Awareness Month, as an annual campaign devoted to promoting cybersecurity among users, companies and institutions. The only difference is that the European Cybersecurity Month is promoted by the European Union.

Throughout the month of October, safety information is provided online and awareness is raised through good practices. Activities are carried out around the entire continent: conferences, workshops, seminars, presentations, etc. Everything in order to make us finally aware of digital hygiene.

We must thank the European Union Agency for Cybersecurity (ENISA) and the European Commission for the fruitful month of European Cybersecurity Month, which, of course, has the full support of the EU Member States.

Some events of Cybersecurity Awareness Month

Like the Homecoming Week for high schools, Cybersecurity Awareness Month is also divided into different segments. We are going to list those established by the National Cybersecurity Alliance this year, 2021.

First week

The first week will be themed on creating strong passwords, using multi-factor authentication, backing up data, and updating software.

Only that way will we be able to realize how dependent we are on technology and reconsider the amount of personal and commercial data that we treasure on platforms located on the Internet. There, at the hand of any cybercriminal.

Second week

The motto? “You must be careful with emails, text messages, and chats opened by strangers and incognitos.” You are just one click away from a suspicious email, link, or attachment, to bother the hell out of you. Indeed phishing and digital scams in general have been on the rise since we began with this pandemic. Since we have the damn COVID among us, phishing attacks represent more than 80% of reported security incidents.

Third week

The third week of Cybersecurity Awareness Month will be focused on supporting, inspiring and applauding students who have chosen, or want to choose, a university career focused on cybersecurity. Whether they are teenagers, adults or confused kids who want to change fields of study. Cybersecurity is cool, youngster! It is fully growing and has space and credits for everyone!

Fourth week

This week we will try to make security a priority for companies more than ever. Incorporate security in products, processes, tools… Promote cybersecurity in employees and teams. Get cybersecurity in the minds of department heads until they themselves celebrate the vanguards and news of this discipline on a daily basis.

Together we check out the key concepts of systems and networks

In the middle of the information century, who has not surfed the Internet or used a computer, be it a desktop or a laptop? But do you really know what a computer is and what it is made of? and what about the Internet?

It is important to know at least the most superficial layer of something as important as computer systems and networks, and therefore, we are going to talk about the key concepts of these two topics.

A computer system is a device made up of the union of hardware and software, which allows the use of this system by a person, whether qualified or not, that depends on the purpose of the system.

But, what does “hardware” and “software” mean? Let’s talk a little more about it.

You can define as hardware the set of physical components that make up a computer system. We are going to define the main components of a computer system, although there are a few more:

• Processor: It is the component in charge of executing all the system programs. It is in turn made up of one or more CPUs.
• RAM memory: This component stores the data and instructions executed by the CPUs and other system components.
• Hard Drives: Information and content are stored here in computer systems.
• Motherboard: It is the component where the others are located, and works as a bridge for communication between them.

Well, now that we have a basic understanding of what hardware is, we move on to software.

Software are all the programs that run on a computer system, among which you may differentiate three types of software:

• System Software: It is responsible for the proper functioning of the operating system and hardware in general, such as device drivers.
• Programming software: They are tools whose sole purpose is the development of new software.
• Application software: It is any program designed to perform one or more specific tasks, for example video games or applications designed for business or education.

We already know what a computer system is, but without communication with the outside we are not making the most out of the potential that these systems have (which is a lot), so we decided to connect it to that abstract site full of information and services: the ‘Internet’.

Everyone knows the term “Internet”, but do we know what the “Internet” is?
We could say that the Internet is the great global network that unites all existing devices, allowing communication between all of them from anywhere on the planet. In turn, this large network is made up of other smaller networks, such as those of a country, city, neighborhood, etc.
Mainly, we distinguish three types of networks:

• LAN: It is the smallest network, a local area network, such as the one in work areas or the one you have at home.
• MAN: It is a somewhat larger network, being able to cover from neighborhoods to cities. They can also be the networks used by large companies for communication between their different offices.
• WAN: It is a network that connects countries or even continents to each other, not devices. We can say that the Internet is the ultimate WAN network.

Ok, we already know what the Internet is made of. But, how do devices communicate on these networks? There are systems used to identify each computer on the network, known as IP addresses. An IP address is, basically, the ID or identifier of a device, so it is unique and unrepeatable.

At the beginning, when the idea of an IP address was created, there were only a few dozen computers in the whole world, and this, as we already know, has gotten quite out of control since then. As a result of this increase, they decided to come up with a new concept, known as DNS (for its acronym Domain Name System).

What the DNS protocol does is, basically, translate the domain name that we enter, either in the web browser or in any other program, and convert it into an IP address, with which it communicates with the destination. Of course, all domain names are stored on DNS servers, scattered around the world to avoid connection overload, and to avoid slow name resolutions.

There are a large number of protocols, each with a different purpose. These protocols are grouped in layers, such as application, transport, Internet or access to the network, according to the TCP/IP model. But, that’s not all. We still lack another important concept in relation to communications between devices, what we know as “ports” of a computer system.

Imagine a road, if all the traffic that wants to enter a city only had a single road, what would happen? Well, the same thing happens in computing, and that is why these virtual ports exist.

These ports range from 0 to 65535, but the first 1024 are reserved for “important” protocols, such as the DNS protocol, which we have mentioned above, belonging to the application layer and that uses port 53 for both UDP and TCP connections.

TCP and UDP are two protocols belonging to the transport layer, whose main difference is that the TCP protocol is connection-oriented. That is, the TCP protocol makes sure that the data reaches its destination, while the UDP protocol sends the data, faster but less securely. This data may even not arrive or at least not fully arrive.

The protocols for web connections or HTTP/HTTPS, both belong to the application layer. Depending on which one you choose, it uses a different port. That is, for HTTP connections, port 80/TCP is used, although it is deprecated due to its lack of security, so the standard has become HTTPS connections, which use port 443/TCP and include a security layer based on SSL/TLS.

Connections made through safe channels or SSH, also from the application layer, use port 22/TCP, and thus we could continue with lots of other protocols.

Of course, these ports are a standard in the systems that receive the requests, the client that initiates the request can use any port that is not reserved to send the request and receive this data. As you can see, this is much easier to communicate with servers, although they can also modify their default ports, but the normal thing is that they do not do so if they want to provide a public service.

Finally, we are going to talk about a concept that, due to the pandemic, is the order of the day: the VPN.

As its name indicates (Virtual Private Network), we can define a VPN as a network “tunnel” that is created between client and server, where data are fully encrypted and sent through the Internet. The common use of VPNs is anonymity on the network, since the IP that is exposed is that of the VPN server, or, also, to be able to visit pages that cannot be accessed from the source country.
In the business environment, this tunnel allows direct communication between the client device with any other device in the network of that server, which allows access to an environment as if we were physically in the office of our company. It also allows access control and registration, which otherwise could not be done.

What’s new in Pandora FMS latest release, Pandora FMS 757

Let’s check out together the features and improvements related to Pandora FMS new release: Pandora FMS 757.

NEW FEATURES AND IMPROVEMENTS

Internal messaging system in the Metaconsole

The messaging system has been implemented in the Metaconsole, which now also allows seeing, similarly to nodes, update notices, messages from other users and system notes.

New documentation in Russian

Although the translation is not yet 100% complete, we’re proud to say that the official Pandora FMS documentation is already in five languages: Spanish, English, French, Japanese and now… Russian!

Collection of new plugins

• Openstack Plugin

New Open Plugin. It captures data from hypervisors and instances remotely through the openstack api.

• Pandora MongoDB

New Enterprise plugin. It obtains server stats, the databases and their collections. Remote plugin, with support for Mongo Atlas.

• Plugin Ldap

New Open plugin, it connects to an ldap account and collects stats related to operations, connections, statistics or waiters.

• Plugin Nginx

Enterprise plugin update. Updated to python 3.

• Plugin VMware

Enterprise plugin update. Added a Reject parameter to discard agent IP automatic update.

• Cisco configuration Inventory Plugin

Enterprise plugin update. Added support for Spanish language systems.

• Plugin Inventario Cisco configuration

Enterprise inventory plugin update. Added option to define credentials in execution parameters.

From now on, let us add “Supernet” into our vocabulary. Learn more!

A set of computers and/or computer equipment connected to each other, and that can exchange data and information, all of those make up a network. The Internet is the network of networks. We could even think that the Internet is the “Supernet”, but we have to tread carefully when using frequently debated terms in computing… For that reason, today, we bring to the fore the term “Supernet” (or Supernetwork), of course always taking an approach from a monitoring perspective.

* Warning: what I write below is my way of looking at things from a practical and sincere point of view. This article only endorses me and, in any case, this entry should be read taking into account the learning approach, it does not intend to be official in any way. That said, let’s start from the basics, which is not the same as starting from scratch.

Terms: Supernet and Supernetting

If we have a network and we buy a new computer, we say that “we add it to a network.” If we have a supernet, then “we add it to a supernet.” We even have a specific verb for it. It is very common to use the term Supernetting; however the following terms are also valid (but less used):

• Prefix aggregation
• Route aggregation
• Route summarization

If we get even more specific, technically we will find differences but for the purposes of this post we will deal with it the same way… Do you think it is daring on my part? Well, there is more!

Request for comments

Although we can go a lot further back in time, the Internet was born in the United States of America, originally called Arpanet, in the late 1960s. A technological predecessor could be the landline from which many of the concepts are born, used when planning the “network of networks”. In fact, the wiring itself, the colors that identify the pairs, are very similar, at a physical or hardware level. This includes the similarities in switched connections (or circuit switching). But, obviously, the Internet and data transport in a digital way ended up completely absorbing telephony.

But the Internet needed more than the physical and conceptual foundation or sustenance of the great American telephone companies. Moreover, October 1969 is marked as the birth of the Internet since the first connection between two computers was made… And it was simply that, since it was not yet a common computer network.

The Internet was born, in my opinion, when pioneer Dr. Steve D. Crocker published the first issue of Request for Comment (RFC) on April 7, 1969. In Issue 6 (RFC 6), Steve Crocker recounts his conversation with Bob Kahn about code conversion for data exchange. RFC 11 publishes the connection implementation in the FAT operating system (yes, that’s what it was called), and I fervently believe that this, published in August 1969, is what enabled the feat performed in October of that same year.

Based on this knowledge base, the RFCs were born: gathering a group of people in their twenties who moved among different universities sharing knowledge and cementing concepts, something that we now do by email… In fact, RFC 733 (1977) outlines this technology and the standard for the email is published in RFC 822 (year 1982).

RFCs grew decade after decade: in 1992, RFC 1338 “Supernetting: an Address Assignment and Aggregation Strategy” was published for information purposes. Yes, at first the supernet was just a mere advertisement, not a protocol, and not even a standard.

Just the following year, in 1993, RFC 1518 “breaks” the paradigm of networks by classes. While class A networks allow millions of IP addresses, the next step – class B networks – only allowed 65 thousand IP addresses: between the two of them the “waste” of IP addresses is very high.

For that reason, the Classless Inter-Domain Routing (better known as CIDR) was born, which is an extension of the original IPv4 addressing system that allows more efficient address allocation. The original class-based method used fixed fields for network identifiers, which was wasteful as I said earlier: most organizations that are assigned those addresses (class A and class B networks) never intended to put so many devices on the Internet.

As additional information, this is the origin of CIDR notation, the suffix that accompanies an IP address (there are 32 bits in an IPv4 address, four octets separated by periods) and that allows describing or narrowing down a range of them. For example, for /20 it allows 4096 IP addresses, for /21 2048 IP addresses and so on, as well as all the way around (all powers of base 2, this is important for a supernet as we will see later). All these numbers can be obtained using the IP address calculator included in Pandora FMS. You may also find many of these calculators online, each with its own style, shapes and colors to present the same data.

Flexible like Pandora FMS

CIDR thus changed the fixed fields to variable length fields and this allowed to assign IP addresses better, and in a more refined way. CIDR IP addresses include a number that indicates how the address is divided between networks and hosts.

For example, in the CIDR address 201.249.0.0/19 the /19 indicates that the first 19 bits are used for the identification of the network and the remaining 13 are used for host identification.

The main purpose of a supernet is to decrease the size of the route table of routers. For example, instead of a router having 8 individual routes, it may have a single route aggregated from these 8 individual routes. This saves memory and processing resources on the routing devices, thus requiring less space to store their route table and less processing power to search the route table. It also provides stability in networks because fluctuations can be isolated, that is, in one part of the network they do not spread to all parts of the network.

Supernetting and Pandora FMS

From Pandora FMS version NG 731 IPAM was included (abbreviation of Internet Protocol Address Management) which allows to manage, discover, diagnose and monitor hundreds of IP addresses.

Within this feature, the supernet, subnets and even virtual private networks (VLAN) are included, all integrated, with the option to export data in CSV files. Unlike creating VLANs, we can only create supernets manually using IPAM. For that, you have to configure, with the necessary parameters, each of the supernets that you want to have, and later add networks already managed with IPAM that may belong to a VLAN. Although it is a manual process from version NG 758, it includes the ability to quickly addy our data from files in CSV format.

To finish off this post, let’s see what the rules that operate a supernet are.

Supernet Rules

Apart from good practices in network configuration, the established rules must always be followed and enforced to avoid chaos reigning.
The rules for creating supernets are as follows:

• Networks must be contiguous or sequential.
• The number of networks to add must be a multiple of two or “base two”.
• And the rule that is somewhat more complicated: compare the value of the first octet not common from the first block of IP addresses (the smallest) of the list of networks to add against the number of networks to add (see previous point). The value of the first non-common octet must be zero or a multiple of the number of networks to be added.

Together we check out the key concepts of systems and networks

In the middle of the information century, who has not surfed the Internet or used a computer, be it a desktop or a laptop? But do you really know what a computer is and what it is made of? and what about the Internet?

It is important to know at least the most superficial layer of something as important as computer systems and networks, and therefore, we are going to talk about the key concepts of these two topics.

A computer system is a device made up of the union of hardware and software, which allows the use of this system by a person, whether qualified or not, that depends on the purpose of the system.

But, what does “hardware” and “software” mean? Let’s talk a little more about it.

You can define as hardware the set of physical components that make up a computer system. We are going to define the main components of a computer system, although there are a few more:

• Processor: It is the component in charge of executing all the system programs. It is in turn made up of one or more CPUs.
• RAM memory: This component stores the data and instructions executed by the CPUs and other system components.
• Hard Drives: Information and content are stored here in computer systems.
• Motherboard: It is the component where the others are located, and works as a bridge for communication between them.

Well, now that we have a basic understanding of what hardware is, we move on to software.

Software are all the programs that run on a computer system, among which you may differentiate three types of software:

• System Software: It is responsible for the proper functioning of the operating system and hardware in general, such as device drivers.
• Programming software: They are tools whose sole purpose is the development of new software.
• Application software: It is any program designed to perform one or more specific tasks, for example video games or applications designed for business or education.

We already know what a computer system is, but without communication with the outside we are not making the most out of the potential that these systems have (which is a lot), so we decided to connect it to that abstract site full of information and services: the ‘Internet’.

Everyone knows the term “Internet”, but do we know what the “Internet” is?
We could say that the Internet is the great global network that unites all existing devices, allowing communication between all of them from anywhere on the planet. In turn, this large network is made up of other smaller networks, such as those of a country, city, neighborhood, etc.
Mainly, we distinguish three types of networks:

• LAN: It is the smallest network, a local area network, such as the one in work areas or the one you have at home.
• MAN: It is a somewhat larger network, being able to cover from neighborhoods to cities. They can also be the networks used by large companies for communication between their different offices.
• WAN: It is a network that connects countries or even continents to each other, not devices. We can say that the Internet is the ultimate WAN network.

Ok, we already know what the Internet is made of. But, how do devices communicate on these networks? There are systems used to identify each computer on the network, known as IP addresses. An IP address is, basically, the ID or identifier of a device, so it is unique and unrepeatable.

At the beginning, when the idea of an IP address was created, there were only a few dozen computers in the whole world, and this, as we already know, has gotten quite out of control since then. As a result of this increase, they decided to come up with a new concept, known as DNS (for its acronym Domain Name System).

What the DNS protocol does is, basically, translate the domain name that we enter, either in the web browser or in any other program, and convert it into an IP address, with which it communicates with the destination. Of course, all domain names are stored on DNS servers, scattered around the world to avoid connection overload, and to avoid slow name resolutions.

There are a large number of protocols, each with a different purpose. These protocols are grouped in layers, such as application, transport, Internet or access to the network, according to the TCP/IP model. But, that’s not all. We still lack another important concept in relation to communications between devices, what we know as “ports” of a computer system.

Imagine a road, if all the traffic that wants to enter a city only had a single road, what would happen? Well, the same thing happens in computing, and that is why these virtual ports exist.

These ports range from 0 to 65535, but the first 1024 are reserved for “important” protocols, such as the DNS protocol, which we have mentioned above, belonging to the application layer and that uses port 53 for both UDP and TCP connections.

TCP and UDP are two protocols belonging to the transport layer, whose main difference is that the TCP protocol is connection-oriented. That is, the TCP protocol makes sure that the data reaches its destination, while the UDP protocol sends the data, faster but less securely. This data may even not arrive or at least not fully arrive.

The protocols for web connections or HTTP/HTTPS, both belong to the application layer. Depending on which one you choose, it uses a different port. That is, for HTTP connections, port 80/TCP is used, although it is deprecated due to its lack of security, so the standard has become HTTPS connections, which use port 443/TCP and include a security layer based on SSL/TLS.

Connections made through safe channels or SSH, also from the application layer, use port 22/TCP, and thus we could continue with lots of other protocols.

Of course, these ports are a standard in the systems that receive the requests, the client that initiates the request can use any port that is not reserved to send the request and receive this data. As you can see, this is much easier to communicate with servers, although they can also modify their default ports, but the normal thing is that they do not do so if they want to provide a public service.

Finally, we are going to talk about a concept that, due to the pandemic, is the order of the day: the VPN.

As its name indicates (Virtual Private Network), we can define a VPN as a network “tunnel” that is created between client and server, where data are fully encrypted and sent through the Internet. The common use of VPNs is anonymity on the network, since the IP that is exposed is that of the VPN server, or, also, to be able to visit pages that cannot be accessed from the source country.
In the business environment, this tunnel allows direct communication between the client device with any other device in the network of that server, which allows access to an environment as if we were physically in the office of our company. It also allows access control and registration, which otherwise could not be done.