A Comprehensive Guide to Wide Area Network Types and Connection Options

Wide area networks (WANs) are a crucial part of modern communication infrastructure. They allow for the connection of multiple local area networks (LANs) over a large geographical area.

There are several types of WANs, including metropolitan area networks (MANs), which connect multiple LANs in a metropolitan area, and wide area networks (WANs) that connect multiple LANs over a larger area.

WANs use various connection options, including T1 lines, which offer high-speed connections, and dial-up connections, which use the public switched telephone network (PSTN) to establish a connection.

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A wide area network (WAN) is a group of networked systems distributed across a large geographic area, which can be as small as a few feet or range to as far away as cities, territories, or nations.

The public internet we use daily is a type of WAN, as devices located around the world communicate with each other. This is because devices are connected through various communications channels, including telephone lines, satellite connections, and fiber-optic cables.

A WAN typically comprises several smaller, segmented networks, such as Local Area Networks (LANs) and Metro Area Networks (MANs), which are connected to form a larger network.

This allows devices in different offices, cities, or even countries to connect and share information as if they were on the same local network. By extending network reach, WANs empower businesses to operate efficiently across geographical boundaries.

WANs leverage many communications channels to transfer data, depending on the WAN type, and can include telephone lines, satellite connections, and fiber-optic cables.

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Wide area networks (WANs) are designed to connect multiple local area networks (LANs) and other types of networks together, allowing users and computers in one location to communicate with users and computers in other locations.

WANs can be built using leased lines, but this can be very expensive. Instead, circuit switching or packet switching methods are often used, which are less costly.

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Routers play a crucial role in WANs, directing data packets between networks and determining the optimal path for each packet. This is done using intelligent devices that can analyze network traffic and make decisions in real-time.

Switches are also an essential component of WANs, connecting devices within a network and enabling communication and data exchange between them.

Modems are used to modulate and demodulate signals, allowing data to be transmitted over various media like telephone lines or cables. This is particularly useful for connecting devices to the Internet or other networks.

WANs can be built using a variety of transmission technologies, including fiber optic cables, copper lines, and satellite links. Fiber optic cables, for example, transmit data as light pulses through thin glass strands, offering high bandwidth and speed.

The following technologies are commonly used in WAN deployments:

Wide area networks (WANs) require reliable connections to function effectively. Many technologies are available for wide area network links, including circuit-switched telephone lines and optical fiber.

In the past, WAN speeds were limited, with a 110 bit/s line being normal in the 1960s. Today, households are connected to the Internet with speeds ranging from 28.8 kbit/s to 100 Gbit/s using 100 Gigabit Ethernet.

Businesses can leverage many types of WAN services to connect their operations, including switched WANs and point-to-point WANs. Switched WANs connect several component LANs into a shared networking infrastructure, while point-to-point WANs connect two LANs through a dedicated, leased line.

Some common WAN technologies include leased lines, MPLS, VPN, and SD-WAN. Leased lines offer guaranteed bandwidth and secure communication between two locations, while MPLS creates dedicated paths through the service provider's network. VPNs create secure connections over public networks like the internet, and SD-WAN simplifies WAN management and optimizes performance.

The following WAN technologies are available to businesses:

Wide area networks (WANs) rely on various technologies to function efficiently. These technologies include circuit-switched networks, which operate on the virtual connection principle.

WANs can be categorized into two main types: switched WAN and point-to-point WAN. Switched WANs connect multiple LANs into a shared networking infrastructure, enabling improved efficiency and scalability.

Circuit-switched networks operate on the virtual connection principle, where all messages take the same path and resources are set aside for this connection. This approach is often used in leased lines, which offer guaranteed bandwidth and secure communication between two locations.

Packet-switched networks, on the other hand, allow packets to follow different routes and are reassembled at the destination. This approach is used in technologies such as MPLS, which routes IP packets through paths via labels instead of looking at complex routing tables of routers.

Multiprotocol Label Switching (MPLS) is a flexible networking technique that supports multiple protocols and directs data based on predefined short path labels. It's often used for latency-sensitive traffic like voice and video.

The following WAN technologies are commonly used:

A wide area network (WAN) offers several advantages that make it a popular choice for organizations. It covers large geographical areas, allowing data to be transmitted quickly and cheaply.

One of the key benefits of a WAN is its ability to minimize travel charges. By allowing employees to access data remotely, organizations can reduce the need for physical travel.

A WAN also enables organizations to connect with the world easily, making it simple to exchange data and conduct business at a global level.

Here are some of the key advantages of a WAN:

On the other hand, a wired WAN has some pros and cons. One of the benefits is its security, as devices must be physically wired into the network, making it more difficult for cyber attackers to gain unauthorized access.

A wired WAN also allows for faster connections, unlike wireless systems that can be subject to outside interference.

However, a wired WAN has some drawbacks, including the need to manage more cables and the limitation of mobility, as employees can only access the network when there is a physical connection available.

Wireless WANs, on the other hand, have some benefits and drawbacks of their own. One of the benefits is flexibility, as the workplace can be anywhere, giving employees the freedom to work from anywhere.

However, wireless networks are generally more vulnerable to attacks and often slower than wired networks.

Security and optimization are crucial for wide area networks. A virtual private network (VPN) creates a secure connection between networks, generally between one that is not secure (the public internet) and one that is secure (a company's WAN).

Security gaps have long been seen as a major weakness in WANs, especially when users are accessing their devices in multiple locations, including their homes. Security measures and policies, including firewalls and antivirus software, should be considered to prevent unauthorized access or compromise.

A secure SD-WAN improves the overall security of the business by providing integrated security and addressing security challenges. This is because SD-WAN solutions must provide integrated security to avoid becoming a potential attack vector.

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Securing Your WAN is crucial, especially when users access their devices in multiple locations. A virtual private network (VPN) creates a secure connection between networks, generally between one that is not secure (the public internet) and one that is secure (a company's WAN).

Using a VPN helps create connectivity and encrypts data, but it doesn't ensure complete security. IT professionals may need to install additional security protocols to deliver the level of security required for the organization.

A single device connected to multiple networks can compromise WAN security. For example, an individual uses the same iPhone for both work and personal use, accessing the company's WAN for work and an unsecured Wi-Fi hotspot for personal use.

Adopting SD-WAN in lieu of a plain WAN can address security challenges. A secure SD-WAN improves the overall security of the business, and it must provide integrated security to avoid becoming a potential attack vector.

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As data traveling through a WAN has increased in volume and complexity, optimization has become crucial to ensure performance.

WAN optimization aims to solve problems with performance, usually related to speed.

It's a process where WAN network engineers reconfigure the network to ensure certain applications receive more bandwidth and can move faster through the network.

This could be the case with a retailer that needs to send transaction data through as quickly as possible to its main data center.

Software-defined wide-area networks (SD-WANs) have increased in popularity over the last several years, removing the manual labor required to optimize a WAN.

SD-WAN solutions increase an organization's efficiency by tracking application performance and using automation to select the best connectivity option.

Because software does the job of choosing the best connection, it's not uncommon to have teleconferencing use a dedicated circuit and email use the public internet.

User experience is key, especially as users may be accessing their organization's network in different environments via different applications.

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SD-WANs are adept at supporting intensive, high-bandwidth applications, such as those involving voice or video, offloading such applications to local internet where possible.

SD-WANs also offer the ability to optimize connectivity to such cloud services as Amazon Web Services or Microsoft Azure.

With the continued migration to Software-as-a-Service (SaaS), organizations and their customers expect their data to travel securely through the cloud.

An SD-WAN has management and reporting features that give a single view of WAN performance.

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A wide area network, or WAN, has a rich history that dates back to the U.S Department of Defense's development of ARPANET, which allowed researchers to communicate and share computer resources remotely.

The internet is actually the world's largest WAN, connecting users all over the globe through secure connections. It's amazing to think about how far we've come in terms of global connectivity.

In addition to the internet, WANs are used in various settings, including enterprises, universities, and even banks. For example, a bank's WAN might connect its branch offices and ATM machines, allowing employees and customers to access information remotely.

The history of WAN is fascinating. It all started with the U.S Department of defense, which developed ARPANET to let researchers communicate and share computer resources remotely.

The roots of WAN were laid out through ARPANET, which used circuit-switched telephone lines, radio wave transmission, or optical fiber transmission to connect users.

ARPANET allowed researchers to exchange data with users all over the world, including clients, employees, buyers, sellers, and students.

WAN has the ability to transmit data, image, audio data, and video data over large distances.

Examples of WANs are all around us. A WAN can connect branch offices within an enterprise, allowing employees working from home to stay connected with the company's main office.

In a university setting, students rely on WANs to access library databases and university research. This is a common sight in many educational institutions.

A bank is another example of an organization using a WAN. Its branch offices and ATM machines are linked through secure connections, making it possible for bank employees and customers to access their services remotely.

The internet is the world's largest WAN, connecting diverse computer networks from around the globe.

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In a switched WAN network, multiple component LANs are connected via a shared networking infrastructure. This setup is best suited for distributed environments where network configuration requirements are largely homogenous.

A switched WAN network can connect hundreds or thousands of locations, making it a great option for large organizations. The technology used in switched WAN networks is often Asynchronous Transfer Mode (ATM) or an ATM network.

The choice of WAN protocol depends on the specific needs of the network. Some common WAN protocols include Asynchronous Transfer Mode (ATM), Frame Relay, and Packet over SONET/SDH (PoS).

ATM is an antiquated network switching technique that uses asynchronous time-division multiplexing to encode data packets into small, uniform cells for transmission across networks. It's not as commonly used today, but it's still an option for some businesses.

Frame Relay is a protocol that breaks data packets into "frames" for transfer across WANs. It's often used by businesses on a tight budget, as it can deliver cheap data transmission.

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Packet over SONET/SDH (PoS) is a protocol that defines how data packets are transmitted over point-to-point links that use fiber-optic connections and SONET or SDH protocols. This protocol is often used in high-speed data transmission applications.

Multiprotocol Label Switching (MPLS) is a protocol that directs data packets based on predefined labels that denote established network paths. MPLS can leverage network protocols like Ethernet and IP for efficient and effective data routing.

Carrier Ethernet extends Ethernet from the LAN to the WAN, allowing businesses to connect their Ethernet LANs to carrier networks via an Ethernet interface. This can create a unified network across different locations.

Internet Protocol (IP) routes data packets across interconnected networks by using unique IP addresses to identify devices at the source and destination.

Here are some common WAN protocols and their characteristics: