Network infrastructure is part of IT infrastructure found within companies in enterprise IT organizations. Network infrastructure is interconnected and is usable for both internal and external communication. The network infrastructure in organizations is important because, in the digital age, the productivity and agility of a company are pegged on excellent equipment, as much as smart employees are also involved. For the smooth running of operations, you require a secure network infrastructure that will not let you down. Without the right infrastructure, you may find yourself suffering from security issues and poor user experience, which can impact the productivity of employees and customer experience and cost your brand its reputation.
It is, therefore, important that you and your organization understand how important network infrastructure is and be aware of the opportunities and possible challenges that come with network infrastructure. When you have the right knowledge of network infrastructure, you will be better placed to have maximum production and helping your organization reach optimum performance. Below, we dive deeper into the topic.
What Exactly Is Network Infrastructure?
The network infrastructure consists of resources needed to make the network work. These resources make network or internet connectivity, business operation, management, and communication within the organization possible. It consists of both software and hardware components, and it is what enables the communication between services, uses, applications, and processes and allows computing.
There is a common and interrelated term to network infrastructure. The term is the IT infrastructure. In the simplest way, it is the same as network infrastructure. Interestingly, the terms are even used interchangeably, and yet; there are ways in which they can differ subtly. IT infrastructure is used to define the large collection of elements of information technology that form the foundation for IT service. It encompasses the physical elements; in essence, the hardware and software components needed to form a healthy IT network.
The network infrastructure, on the other hand, is seen as a smaller category compared to IT infrastructure. It is, therefore, as described before, a component of larger IT infrastructure. To have sustained success and cohesive solutions, a company should put in place both network and IT infrastructure. Below, the diagram expresses some of the components within a network infrastructure:
Why is network infrastructure important?
Network infrastructure is important because it can make or break a company and its reputation. It is, hence, important not only to have reliable IT infrastructure but also qualified personnel. These three components will work hand-in-hand to ensure a good and reputable company. The network is important mostly because it allows communication and connection. If there is no network infrastructure, other IT components such as software and hardware hardly make any sense and are not of much use. If, however, your network infrastructure is rich, clean, and secure, you are on your way to organizational excellence.
Challenges Surrounding Network Infrastructure
There are also challenges that surround network infrastructure that can prevent optimal functioning. Some of these challenges include:
- Centralization of traffic
- Duplication of data and how to deal with it
- Relaying the right data to the correct tool
Centralization of Traffic
An organization usually has several different locations or sites and subnets. If there is no centralized hub, it can be difficult to monitor and manage the network, and network visibility may also be an issue. Some companies have found a way around this, and typically, they use network infrastructure solutions to better understand what their network is and to centralize the heavy traffic. Infrastructure solutions also help companies to monitor and understand any data that traverses their networks. Using network infrastructure solutions, therefore, helps improve the security of a network and helps network operations teams address their issues with performance.
Data Duplication
Data duplication is also a major issue when it comes to network infrastructure. In Extreme instances, duplication can occur for up to 50 % to 66 % of network traffic. Duplicate data may present problems, especially with regards to network security solutions. If network security solutions encounter a lot of duplicate data, there are new risks involved. First, the duplicate data makes the solutions slow down, and eventually, they are not able to detect threats within the network infrastructure. Removing duplicate data is, therefore, not just important but critical for the well-being of the organization as well.
Relaying the Right Data to the Correct Tool
Different organizations use a variety of different cybersecurity providers and tools. These security providers charge organizations based on the amount of data they need to process. It is, therefore, important that the data sent is relayed to the right tool. If data is sent from various sources to one and the same tool, it may end up not only being ineffective but also costly, especially in a case where one tool suits a different type of data than another one.
There are solution providers that help organizations and companies to keep an efficient, clean network, as this work is not a small task. It may, therefore, be helpful to have a team with deep security and networking expertise in your organization.
Unlike in the past, where network infrastructure was clear cut, today, the network infrastructure field is dynamic and complex, with a mixture of cloud and on-premise management. Even when on-premises networking happens, it is possible for a company to have a mix of vendors and networks. When companies merge, and when there is organic growth, there tends to be further mix up in the network infrastructure, which eventually, ends up having a negative impact on network infrastructure.
When such eventualities come about, sometimes companies end up with up to five tools for monitoring and managing what is now a hybrid network. If you want to have your company and network safe and performing at its peak, this may not be the best or ideal environment. You may need to establish a central hub where you can view all your network traffic and get the tools to direct the right traffic to the right tools.
Network visibility remains important mainly because of the good performance of a company relies mainly on the infrastructure and its ability to monitor performance and detect threats. If a company is able to deal with network blind spots, then they are able to uncover the blind spots, identify threats from the sources uncovered, and remediated solutions quickly. With these solutions in place, it is possible for the organization to remove duplicate data and allow for efficiency in the network and security tools.
Network Protocols and Standards
The definition of terms is important in networking. From the above sections, we have had a step-by-step development of concepts that have so far given an idea of how networks function. Now, the reader is going to be introduced to network protocols, what standards are, and what role they play in networking.
Network protocols are the policies and standards, including formats, rules, and procedures that define how two or more devices communicate over a network. These protocols govern end-to-end processes and ensure that data and network communication is secure and also timely. Protocols include all the requirements, processes, and restraints involved in initiating and accomplishing communication when it comes to servers, computers, and other devices within the network. Protocols have to be affirmed and installed by both receivers and senders so that data and network communication is possible and to ensure the application of software and hardware nodes that do the communication over a network.
There are types of network protocols:
- Network communication protocols, such as HTTP & TCP/IP
- Network security protocols, such as HTTPS, SFTP, and SSL
- Network management protocols, including SNMP and ICMP
It is important for anyone who is seeking to understand networking to understand network protocols. This information is usually key to understanding communication and troubleshooting communication problems within networks. Also, these network protocols give the network devices a common language through which they can communicate. Without protocols, therefore, computers cannot achieve communication with each other. Network end users heavily rely on these network protocols to connect.
How Do Network Protocols Work?
You may be wondering how network protocols work. In the simplest terms, these protocols work by breaking down what are seemingly large processes into narrowly definite, more discrete tasks across each level within the network. In a standard model, the Open Systems Interconnection model, there are network protocols that govern the activities in each layer in the exchange.
A protocol suite is a set of network protocols that work together. The TCP/ IP suite is a type of suite that includes a number of protocols across layers. These work together to enable internet connectivity. The network protocols involved include:
User Datagram Protocol
This protocol is simply referred to as UDP and takes the responsibility of acting as an alternative protocol of communication to the transmission control protocol. UDP is used in establishing loss-tolerating and low-latency connections between the internet and various applications.
Also known as TCP, this control protocol uses rules that have already been set to ensure communication exchange between internet points in information packets.
Internet protocol
Also known as IP, this protocol uses rules that have been set to receive and send messages based on the internet address level.
Other network protocols, including hypertext transfer protocol and FTP
These protocols have defined a set of rules that help in the exchange and display of information.
All packets that are transmitted and received within a network have binary data. Usually, a packet will have a header at the beginning of a packet. This header stores information regarding the sender and the intended destination of the data. Some packets also have footers at their end, and they contain additional information about the sender and destination. The network protocols involved then process the headers and footers and sieve messages of each kind as they move among devices. There are groups that set up these industry standards and publish them.
Network Communication Protocols
Communication protocols include formal descriptions of rules and digital message formats that are required during the exchange of information between and in computing systems and devices and in telecommunications at large. Communication protocols cover a wide range of processes, including error detection, authentication, and signaling and error correction. These protocols also describe the synchronization of digital and analog aspects of communication, semantics, and syntax. These protocols are implemented in both hardware and software, and it is not surprising that there is an abundance of communication protocols used in both digital and analog communications.
In short, computer networks cannot be existent without communication protocols. The properties of transmission that a protocol is able to define include transmission size, packet speeds, techniques of synchronization and handshaking, types of correction errors, sequence control of packets, address formatting, routing, and address mapping. Some well-known communication protocols are Hypertext Transfer Protocol (HTTP), Simple Mail Transfer Protocol (SMTP), User Datagram Protocol (UDP), File Transfer Protocol (FTP), and Internet Message Access Protocol (IMAP).
Where digital computing systems are involved, the rules of the communication protocols are expressed by data structures and algorithms. Protocols, therefore, serve the same purpose to communication as algorithms and programming do to communications. Operating systems contain processes that cooperate and manipulate data that is shared so that they connect with each other. The connection is usually guided by protocols that can be entrenched within the very course. There is no shared memory, and so, the systems that are communicating have to do so using s common transmission medium. Transmission in such a case is not fully reliable, and there may be the use of different operating systems and even hardware.
For the successful implementation of a networking protocol, the software models have to be interfaced with the machine’s operating system’s framework that has already been implemented. The framework is responsible for the implementation of networking as a functionality in the operating system.
Protocol algorithms are articulated in what is a transferable language in programming, and the protocol software becomes independent of the operating system. Some of the well-known frameworks are the OSI model and the TCP/ IP models.
When the internet was developed, the successful design approach for both operating systems and compiler was abstraction layering. A remarkable resemblance between programming languages and communication protocols exists, which is the reason that the original monolithic schmoosing plans were disintegrated into liaising protocols.
Eventually, this contributed to the upsurge of the layered protocol perception, which, today, is the center of protocol design. Typically, systems cannot utilize a solitary protocol for broadcast. As an alternative, systems utilize collaborating protocols, which has been described above as a protocol suite. Protocols are arranged according to their functionality in clusters, for example, a cluster of the transport protocol. In this case, functionalities are plotted into layers, and each layer solves a specific type of issue. For transmission of a message, protocols are selected from every layer.
The next protocol is accomplished through the extension of the message with the next layer’s protocol selector. There are other basic requirements needed in this process, and getting files transverse the network is only a small fragment of the protocol. When files are acknowledged, it is evaluated so that the context of progress within the conversation is established. The protocol, then, contains guidelines that describe the context as well. The syntax of communication is expressed through the rules of context. There are other rules that express the semantics of communication.
To begin communication, the communication systems facilitate the sending and receiving of messages. Thus, protocols govern the rules of transmission, while the following must be adhered to:
Data formats that will enable records interchange
Bit-strings of digital messages are exchanged and divided into fields such that a field will carry only material pertinent to the protocol. The bit-string is usually separated into the payload and header. The payload carries the message while the header has information pertaining to the protocol operation. If a bit-string is longer than the SMTU, then it is divided into pieces that are of the right size.
Address mapping
In some instances, protocols are required to map addresses of a particular scheme on those of another. For instance, for an Ethernet MAC address application to translate a specified logical IP address, it has to map addresses.
Address formats for data exchange
Addresses exist solely for the purpose of identifying senders and recipients. Bit-strings contain headers that carry addresses, allowing for the receivers to resolve if the bit-strings are appropriate, thus must be processed or if they must be ignored. The connection between the receiver and sender is identified using what is known as an address pair. Address values, sometimes, consist of special meanings. For instance, if an address is comprised of all -1s, then it can be supposed that it is addressing every station of the network and the message shall be broadcast so that the entire local network receives it. The rules that are used are referred to as addressing schemes, which determine the meanings corresponding to the address values.
Routing
Routing typically happens when systems do not have a direct connection with each other. Intermediary systems are, therefore, needed to send messages in place of the source along the route, which is called “routers.” The way the routers connect through routers on the internet is known as internetworking.
Detecting transmission errors
If there is a possibility of data corruption anywhere within a network, then it is necessary that errors are detected and eliminated as soon as possible. Usually, the CRCs of any data is attached to the packet’s end, and this makes it possible for whoever is receiving the data to detect corruption in it because they can see the differences. In such a case, the receiver rejects the packet-based in these CRC differences and makes arrangements for fresh transmission.
Time outs and retries causing loss of information
Sometimes, packets may be delayed in transit, or they may be lost on the network. To deal with such issues, some senders who are operating under protocols can expect that the receiver acknowledges that they received the correct information within a relatively short time. When, therefore, there is a timeout, the receiver may need to inform the sender who retransmits the information. In the case where links are permanently broken, there is really no need for retransmission, so the number of retransmissions is usually limited. If the limits for retrying are limited, then what occurs is an error.
Flow control
The importance of flow control resides on the sender’s task of transmitting data fast— faster than what the receiver’s network equipment can actually process. It is, however, possible to control flow by messaging to the sender.
The direction of the flow of information
If transmissions can only occur in one direction at a time, as transmission happens on half-duplex links, then there is a need to address transmission direction. Arrangements are made to accommodate contention, like in a situation when two parties concurrently need to transfer data.
Control of sequence
As we explained above, bit-strings may sometimes be divided into pieces. When this happens, the pieces of bit-string sent on the network may get delayed or get lost completely. Sometimes, they may end up taking different routes to their destination and what results is that the bit-strings arrive out of sequence. Resubmission, on the other hand, can result in pieces that are duplicates. However, it is still possible to mark pieces with sequence information such that the receiver is able to determine what was duplicated or lost and ask for retransmission where information was lost. It also becomes possible to reassemble what could have been the original message.
Protocol Design Principles
Network protocol design principles have been based on systems engineering principles. Therefore, to design complex protocols, decomposition into smaller cooperating protocols is necessary. Operating systems operate synchronously. The synchronization of software is a primary aspect of concurrency in programming. This receives and sends communication in the right sequence. This type of programming, when it comes to operating systems theory, has always been a topic among programmers. If carefully studied, you will realize that there are several analogies between programming and communication. In such a case, the CPU is likened to a transfer mechanism of a protocol. Below, I introduce the rules that allow programmers to design protocols that are independent of each other but can cooperate.
Layering
Protocols are layered in modern protocol design so that they can form a protocol stack. Layering comprises a design principle that splits the protocol into smaller phases that complete specific parts while interrelating with the protocol’s other areas in minor but well-defined means. The layers have the role of testing and designing independently the protocol’s various parts, thereby eradicating the chances of combinatorial explosion while keeping the designs simplistic.
The internet’s communication protocols are supposed to function in, not only complex but also, diverse settings and are designed for modularity and simplicity, and they fit into the hierarchy of layers as defined by the internet protocol suite. TCP and IP, the first two protocols that cooperate come as a result of decomposing the original TCP into a layered suite of communication.
Another protocol is the seven-layered model or the “OSI model.” This was developed for general communication as a reference model. The difference is that this layer has a more rigorous concept of functionality and stricter rules of protocol interaction. Application software is always built on a strong transport layer the routing mechanism, and datagram delivery underlies the transport layer. The routing mechanism is connectionless when it comes to the internet. Network link technologies are the layer on which packets relay upon networks. Network link technologies include Ethernet which is physical layer technology. Layering allows the exchange of technologies when necessary; for instance, to accommodate the connection of networks that are not similar, protocols can be stacked in a tunneling arrangement.
Protocol layering is, hence, the basis for protocol design. Protocol layering allows the decomposition of complex protocols into simplistic ones that can cooperate. Also, since every protocol goes into a protocol layer, this can be seen as functional decomposition. Each distinct protocol layer has distinct problems related to communication. The IP suite consists of internet-network and application-transport functions. Together, they make up a layering model or layering scheme.
Network architecture and protocol layering design are interrelated, so they have to be designed alongside each other. The features of these two in relation to each other are as described in the next paragraphs:
The internet is a source of universal connection. Any two computers that connect to the internet can, therefore, communicate. All computers on the internet are identified by an internet address and reach the user as one huge network composed of interrelated physical networks. This is what we know as the internet, which is a system of interconnection that is also known as “internetwork”.
Internet addresses consist of the host-id and net-id. The host is identified by the hosted, while the network is identified by the net-id. The term host can mislead, as often, a computer may have multiple work interfaces, and each will have its own unique address. The internet address, on the other hand, does not identify a connection to one computer but rather to the network. This is the id that is used by routers to determine where a packet should be sent.
Routers ensure the interconnection of physical networks. They forward packets that appear between the interconnected networks and make it possible for one host to reach another when on a physical network. There is a flow of communications between two systems that communicate through routers, and datagrams are delivered from router to router until one that can deliver the datagram to the attached network is reached.
A routing table is consulted in the case where a decision has to be made, whether a datagram needs to be sent to a router closer to the destination or it can be delivered directly to the network. The routing table typically consists of paths and networkings that need to be followed to reach a network. The path prescribed is, therefore, either direct (there’s a sign that the datagram can be brought straight to it) or not (there is an alternative route that is closer to the destination).
All networks, be it WAN, LAN, or point-to-point links, are treated as the same network. The internet offers a packet-switched system that adapts well to a range of hardware, including Ethernet. Connectionless delivery involves streams and messages being allocated into pieces and are multiplexed on high-speed interconnected machines that allow simultaneous use of connections.
The divided pieces each carry information that helps identify what the destination is. The delivery is, however, unreliable, as sometimes, packets get lost, delayed, delivered despite defect, or duplicated without warning to either the source or receiver. This unreliability comes as a result of a shortcoming in which the underlying networks fail, or resources are exhausted. The internet protocol defines an unreliable connectionless system. Also, the routing function is specified by the IP protocol. Virtual circuits between senders and receivers are built up through connection-oriented systems. Once virtual circuits are built up, datagrams are sent like any other data through virtual circuits. This data is forwarded to IP protocol modules.
The transmission control protocol defines a reliable stream transport service. These services are layered; on top are the application programs, also called “application services,” which can utilize the transmission control protocol. Should the program interrelate with the packet delivery system, the process takes place through the user datagram protocol.
Software Layering
Software layering/ design is done after the protocols, and protocol layering has been established. Software is layered in an organization and has a relationship with protocol layering. To send messages on a system, the modules have to interact such that the top one interacts directly with the one below it. It then hands over the message for encapsulation. The module establishes a reaction, which is encapsulating the data presented within its data area and filling the header with the data according to the protocols.
To interrelate with the module right beneath it, it passes over the newly compiled information where it is appropriate. The module at the bottom directly interacts with the module at the bottom of the next receiving system such that the message gets sent across. The reverse happens on the receiving system such that the message is eventually delivered to the destination in its original form if, by good luck, it does not experience any protocol violations or transmission errors.
When it comes to protocol errors, the delivering module discards any received pieces and hands to the source of the piece on the same layer, the report of an error condition. It does this by dispensing an error message below or delivering it across, in the case where there is a bottom module. The layer that introduced division and reassembly handles the stream of data and division of the messages into pieces, and their final reassembly is done at the final destination. The translation of programs is divided into the following:
- Loader
- Compiler
- Link editor
- Assembler
This signifies the layering of the translation or software, which allows them to be designed independently. The complexity of program translation could be conquered in some ways, and these ways could be applied to protocols; the brains behind the TCP/ IP protocol suite ensured that they imposed the same layering when it came to software frameworks.
Strict Layering
Strict layering involves adherence to a layered model. However, this cannot be considered an ideal method of networking since strict layering typically can cause severe effects on the performance of a system. There must, therefore, be a trade-off between performance and the simplicity offered by layering. Researchers criticize the rather widespread use of protocol layering for the primary reason of having a probability of duplication between a higher layer and a lower layer’s functionality.
Protocol Development and the Need for These Standards
Protocols have the selected standards for communication to happen ultimately. Rules are expressed through data structures and algorithms. The operating system and hardware are independent, and this is enhanced by the expression of the algorithms into what is a portable programming language.
The standards of the protocol are achieved by obtaining the support and, ultimately, approval of a standards organization. The standards organization is responsible for protocol development. An agreement is created for the organization’s members to adhere voluntarily to the result of the work.
Often, these members control the larger market shares relevant to protocols, and the standards are reset by the government because they also serve an important public interest. Sometimes, they do not gain enough acceptance, and the government or law has to come in disclosing the source code and enforcing it for the sake of the public.
To further enhance an understanding of the importance of these standards, you can take the example of IBM’s bi-sync protocol. This early link-level protocol was for use in correcting two nodes that were separate. When it was used in a multimode network, some deficiencies were realized. Manufacturers and organizations can enhance the protocol as they see fit in the absence of standardization, and this has led to the creation of versions that are even incompatible on networks. Today, there exist over 50 variants of the BSC, something that could have been stopped by the presence of standardization.
Sometimes, protocols fail to go through the standardization process and yet still gain dominance in the market. The protocols, in this case, are called de-facto standards. De-facto standards tend to be a common trend in monopolized markets, niche markets. Sometimes, they are used to scare away competition, and this can have a negative impact on the market.
Standardization is, therefore, a way to counter-act de-facto standards and their ill results. However, de-facto standards are not always negative. In some instances, such as the case of GNU/ Linux, there is no undesirable control on the market. The reason for this is that the sources are published and maintained openly, which invites the existence of competition. The solution for open systems interconnection, therefore, does not have to be standardized.
