{"id":71753,"date":"2025-05-09T21:18:08","date_gmt":"2025-05-10T00:18:08","guid":{"rendered":"https:\/\/a3aengenharia.com\/en-us\/content\/technical-articles\/performance-in-computer-networks\/"},"modified":"2025-05-09T21:18:08","modified_gmt":"2025-05-10T00:18:08","slug":"performance-in-computer-networks","status":"publish","type":"articles","link":"https:\/\/a3aengenharia.com\/en-us\/content\/technical-articles\/performance-in-computer-networks\/","title":{"rendered":"Performance in Computer Networks"},"content":{"rendered":"\n

Performance issues are critical in computer networks. In environments with hundreds or thousands of interconnected devices, complex interactions emerge, often with unpredictable consequences.<\/p>\n\n\n\n

This complexity can result in performance degradation, often without an immediately identifiable cause.<\/p>\n\n\n\n

In this article, we will cover some essential aspects of network performance.<\/p>\n\n\n\n

Take a look!<\/p>\n\n\n

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What Defines Network Performance?<\/h2>\n\n\n\n

Understanding how a network behaves under load is, unfortunately, closer to an art than an exact science. There is a shortage of theoretical models that can be applied practically in real environments. The most useful references available are guidelines based on actual field operation experience.<\/p>\n\n\n\n

The effective performance perceived by applications depends on the interaction between the data link, network, and transport layers.<\/p>\n\n\n\n

Poorly sized networks, unbalanced topologies, undersized active equipment, or the absence of control mechanisms degrade the user experience, compromise critical applications, and create bottlenecks that are difficult to diagnose without an adequate methodology.<\/p>\n\n\n\n

Performance Measurement and Troubleshooting<\/h3>\n\n\n\n

When a network shows slowness, instability, or loss of connectivity, users commonly turn to the technical team to report the problem and demand immediate solutions. However, any effective intervention depends first and foremost on an analysis grounded in concrete data<\/strong>.<\/p>\n\n\n\n

Accurate diagnosis requires systematic measurements taken at different layers of the protocol stack and at multiple points in the infrastructure. Relevant metrics include, for example, the response time between sending and acknowledging a segment, the effective transfer rate (throughput), packet loss per time interval, jitter, and the total volume of data processed over a given period.<\/p>\n\n\n\n

Network troubleshooting<\/strong> is the process of diagnosing and resolving problems that affect connectivity, performance, and the operation of network infrastructure. This process involves identifying the source of network problems<\/strong>, which may lie either in the physical layer<\/strong> (such as cabling and equipment) or the logical layer<\/strong> (configurations and protocols).<\/p>\n\n\n\n

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Main Performance Problems<\/h3>\n\n\n\n

Identifying and understanding the main points of degradation is essential for building resilient, scalable environments prepared to sustain performance under different load scenarios.<\/p>\n\n\n\n

Below, we cover the most recurring problems and the effects associated with each one.<\/p>\n\n\n\n

Congestion<\/h4>\n\n\n\n

Congestion occurs when the traffic volume at a point in the network exceeds the forwarding or switching capacity of the responsible device, such as routers, switches, or firewalls. This condition leads to packet queues, buffer saturation, and eventually packet loss.<\/p>\n\n\n\n

Congestion may be temporary, caused by spikes in utilization, or recurring, when there are sizing failures or no traffic control mechanisms. Environments without proper prioritization, such as QoS, tend to amplify the impact, affecting even time-sensitive applications such as voice, video, and remote access.<\/p>\n\n\n\n

Imbalances Between Interfaces<\/h4>\n\n\n\n

Imbalances between interfaces occur when interconnected devices operate with different link capacities<\/strong>, such as connections between gigabit ports and Fast Ethernet ports. This type of asymmetry introduces predictable bottlenecks and limits overall network performance.<\/p>\n\n\n\n

When a higher-speed interface sends data to one with lower capacity, there is a risk of saturating the receiving port<\/strong>, creating queues, and dropping packets. This behavior affects not only direct traffic but also other flows sharing the same path or switching device.<\/p>\n\n\n\n

Jitter<\/h4>\n\n\n\n

Latency variation, known as jitter<\/em>, represents a critical challenge for time-sensitive applications such as voice over IP (VoIP), video conferencing, video monitoring, and real-time streaming. Even when bandwidth is sufficient, a lack of regularity in packet delivery can significantly compromise the quality of the experience.<\/p>\n\n\n\n

Networks subject to jitter behave unpredictably, with fluctuations in delivery time caused by intermittent congestion, lack of traffic prioritization, or uncontrolled link sharing.<\/p>\n\n\n\n

Synchronous Overload<\/h4>\n\n\n\n

There are also situations of synchronous overload<\/strong>, triggered by specific events. A classic case occurs when a malformed segment is transmitted, for example, with an invalid port number. If that segment is sent to a broadcast address, each receiving device may generate an error response, resulting in an ICMP response storm<\/strong>.<\/p>\n\n\n\n

This type of broadcast storm can collapse the network. This behavior was especially problematic in UDP networks until the ICMP protocol was adjusted to suppress responses to broadcast errors in UDP segments. In wireless networks, the risk is even higher because of the natural use of broadcast and the limited bandwidth in those media.<\/p>\n\n\n\n

Another common example of synchronous overload occurs after a power outage<\/strong>. When power is restored, multiple devices reboot simultaneously. During the boot process, hosts commonly request addressing via DHCP and begin loading operating systems over the network. In data centers, this simultaneous behavior can easily saturate servers and collapse the remote boot service.<\/p>\n\n\n\n

High-Performance Network Architecture<\/h3>\n\n\n\n

Adjustments, measurements, and good troubleshooting can significantly improve network performance, but they do not replace a good design from the start<\/strong>. In a poorly conceived architecture, the room for optimization is limited. In such cases, network redesign becomes unavoidable to reach adequate efficiency levels.<\/p>\n\n\n\n

Physical Network<\/h4>\n\n\n\n

A high-performance network architecture starts with a solid physical foundation.<\/p>\n\n\n\n

Logical performance will only be consistent if the elements of the physical infrastructure are correctly specified, installed, and validated.<\/p>\n\n\n\n

This includes everything from structured cabling to the selection of active equipment, along with frequently neglected aspects such as electrical distribution and surge protection. Below are the main components of this layer.<\/p>\n\n\n\n

Cabling Infrastructure<\/h5>\n\n\n\n

The operational stability of a network depends directly on the quality and compliance of its cabling infrastructure.<\/p>\n\n\n\n

Poorly executed projects introduce signal loss, crosstalk, impedance variations, and degradation of packet integrity, factors that affect communication even between high-capacity devices.<\/p>\n\n\n\n

Adopting standards such as TIA\/EIA-568<\/strong>, using certified materials, and physically segregating links by service type (data, voice, automation) are fundamental practices for ensuring sustained performance.<\/p>\n\n\n\n

Well-planned technical pathways, standardized identification, compliance with bend radius, electromagnetic interference control, and validation with certifiers ensure that the physical layer does not become a future point of failure.<\/p>\n\n\n\n

Wi-Fi Network Coverage<\/h5>\n\n\n\n

The Wi-Fi coverage design must be treated with the same technical rigor applied to cabling. Incorrect access point distribution, channel overlap, or power imbalance between cells can generate dead zones, high latency, and throughput degradation.<\/p>\n\n\n\n

For corporate environments, it is essential to conduct spectrum surveys, apply channel planning<\/strong> based on the device density model, and adopt controllers with dynamic RF management. In addition, the coexistence of critical services in the wireless medium and the application of QoS policies compatible with sensitive traffic such as voice and video must be considered.<\/p>\n\n\n\n

Network Equipment<\/h5>\n\n\n\n

The selection of network equipment must be based on technical criteria that go beyond the nominal speed of interfaces. It is necessary to consider switching capacity<\/strong>, packet forwarding rate<\/strong>, buffer availability<\/strong>, internal latency time<\/strong>, support for current protocols (802.1Q, 802.3ad, LACP, SNMP, QoS)<\/strong>, and management and security features<\/strong>.<\/p>\n\n\n\n

Using equipment with limited MAC tables, insufficient buffers, or no VLAN support can seriously compromise network performance. The same is true for access switches based on Fast Ethernet, which, although still common in legacy environments, introduce critical bottlenecks in gigabit or multigigabit backbones.<\/p>\n\n\n\n

Networks designed based only on the end user’s access speed tend to fail in scenarios with multiple concurrent services<\/strong>, such as video surveillance systems, cloud applications, IP telephony, and integrations with IoT devices.<\/p>\n\n\n\n

Electrical Distribution and Protection<\/h5>\n\n\n\n

Although it is not a direct part of network traffic, the quality of the electrical supply directly interferes with the stability of active devices. Voltage drops, frequency variations, surges, and the absence of an adequate functional grounding system are frequent causes of intermittent failures, unexpected equipment reboots, and data corruption in sensitive devices.<\/p>\n\n\n\n

The adoption of redundant power systems, the use of UPS units with compatible runtime<\/strong>, surge protection in IT panels, and the proper implementation of grounding and equipotential bonding are minimum requirements in environments that demand high availability. Neglect in this area compromises the entire network, even when all other elements are correctly specified.<\/p>\n\n\n\n

Logical Network<\/h4>\n\n\n\n

A well-designed logical architecture allows the network to remain stable and predictable even under variable load, multiple concurrent services, or adverse conditions.<\/p>\n\n\n\n

Segmentation Through VLANs<\/h5>\n\n\n\n

The use of VLANs enables the logical separation of broadcast domains within the same physical infrastructure. This segmentation reduces unnecessary traffic between devices, improves security through isolation, and facilitates the management of groups of equipment or specific services (for example, users, servers, IP cameras, and automation systems).<\/p>\n\n\n\n

Correctly planned VLANs prevent the spread of unwanted packets and simplify the application of security policies, ACLs, internal routing, and QoS. They are also essential for ensuring network scalability in environments with multiple functional areas or converged services.<\/p>\n\n\n\n

QoS and Traffic Prioritization<\/h5>\n\n\n\n

Network traffic is not homogeneous. Applications such as VoIP, video conferencing, and control systems require low latency, minimal jitter, and continuous delivery. Services such as backup, cloud synchronization, and web browsing are more tolerant of variation.<\/p>\n\n\n\n

Implementing QoS (Quality of Service) policies allows packets to be classified, marked, queued, and handled according to their criticality. This ensures that the most sensitive flows are transmitted with priority, even in high-utilization scenarios. Without QoS, any temporary congestion can degrade essential services.<\/p>\n\n\n\n

Routing and Logical Redundancy<\/h5>\n\n\n\n

In networks with multiple subnets and distribution points, proper routing is essential to ensure efficient communication and resilient path selection. Dynamic protocols such as OSPF, EIGRP, or BGP allow rapid adaptation to failures and load balancing across available paths.<\/p>\n\n\n\n

In addition, implementing mechanisms such as VRRP or HSRP ensures gateway redundancy and automatic failover. Designs that rely only on static routing and lack logical contingency are subject to total interruptions when isolated failures occur.<\/p>\n\n\n\n

Broadcast and Multicast Control<\/h5>\n\n\n\n

Broadcast and multicast traffic, when left uncontrolled, can consume valuable network resources and negatively affect overall performance. The use of VLANs together with mechanisms such as storm control<\/strong>, IGMP snooping<\/strong>, and per-port broadcast limiting<\/strong> is fundamental to maintaining stability in extensive domains.<\/p>\n\n\n\n

Environments with IoT devices, broadcast-based discovery, or multicast video transmission must be carefully balanced to prevent traffic control itself from becoming a saturation vector.<\/p>\n\n\n\n

The Host’s Role in Network Performance<\/h3>\n\n\n\n

Although the physical and logical infrastructure sustains most network performance, host behavior also directly influences communication efficiency. In many cases, the limitation lies neither in the link nor in the network equipment, but in how the operating system and the application handle data<\/strong>.<\/p>\n\n\n\n

At the operating system level, factors such as buffer management, interrupt handling, process scheduling, and system calls<\/strong> affect the performance of the network stack. Hosts that perform multiple internal packet copies, operate with undersized buffers, or process very small blocks create local overhead and noticeably increase latency, even on optimized networks.<\/p>\n\n\n\n

At the application layer<\/strong>, the way data is handled directly influences performance. Applications that segment data inefficiently, do not maintain persistent connections, or operate with inadequate sending intervals reduce the use of the transmission window and penalize throughput. Services that use excessive polling, redundant retransmission, or are not latency-aware end up generating unnecessary or poorly optimized traffic.<\/p>\n\n\n\n

The Importance of Documentation<\/h2>\n\n\n\n

Technical documentation is an integral and mandatory part of any high-availability network project. Its absence compromises the safe operation of the environment, increases response time in failure situations, and directly impacts the company’s operational cost.<\/p>\n\n\n\n

Corporate environments are subject to unplanned interruptions (downtime) that, even when brief, result in productivity loss, interruption of essential services, system unavailability, and, in many cases, financial loss. In critical networks, every minute of unavailability represents a real cost, whether in operational, commercial, or reputational terms.<\/p>\n\n\n\n

A network structure without updated documentation creates barriers to fault identification, makes corrective or preventive maintenance difficult, and delays any troubleshooting process. On the other hand, the existence of complete technical documentation drastically reduces diagnosis and recovery time, enables fast and assertive actions, and supports operational continuity with minimal exposure to risk.<\/p>\n\n\n\n

The documentation must cover all project elements, including:<\/p>\n\n\n\n