Network Device Monitoring Guide

Network Device Monitoring Guide

Networks allow computer systems and applications to communicate with one another. When networks fall or services are interrupted, the effects are felt far and wide and can result in severe service disruptions and economic losses.

As a result, network monitoring is a mission-critical role for businesses. Visibility into network performance is critical for network engineers to be proactive and spot issues before they cause disruptions.


Monitoring, a subset of network management, detects slow or failing computer network components before they cause problems. Servers that are crashing, freezing, or overloaded, as well as faulty switches, routers, and other troublesome parts, can all create network interruptions or failures. The network monitoring system’s role is to notify the network administrator as soon as a malfunction occurs that causes an interruption.

Network monitoring tools are commonly used by administrators to monitor and manage their networks. With network monitoring services, users can monitor network performance and assess if a web server is properly linked to worldwide networks and working as intended. Many network performance monitoring solutions can visualize networks and applications from start to finish.

Process of Using Network Traffic Monitoring System

Identifying the devices to be watched and the performance metrics is the first step in efficient network monitoring. The next step is to select a suitable monitoring interval.

Because routers, servers, and switches perform mission-critical services, they must be monitored more frequently. To put it another way, internet traffic monitoring intervals are determined by specific factors and usage and should be selected based on the circumstances. Users can customize their alerts with the greatest systems.

All components of IT infrastructure, including connection, network, and security systems, should be included in a network monitoring design. It should, in theory, give administrators a single picture of the network, allowing them to monitor devices in real-time and perform network maintenance, problem identification, reporting, and resolution.

System administrators, network administrators, and IT managers should all receive reports from web traffic monitoring tools. A secure network monitoring solution should also be simple to use and have basic drill-down and reporting features.

How Does it Work?

The Open Systems Interconnection (OSI) model breaks down the functions that allow computers to communicate and receive data. Information can be exchanged between two systems, such as two computers or apps, using networks. To be transported across a network, data must pass through each component of the OSI, using different protocols, starting at the physical layer and finishing at the application layer. Network monitoring gives engineers visibility into numerous network components, allowing them to troubleshoot network problems at any layer.

Foundation of Networking Monitoring

Monitoring network devices is essential for ensuring that they are available, up, and functioning when they are required. Because devices, no matter how tough they are, might fail, availability is commonly expressed as the percentage of time the device is up and functioning during a given period. As a result, if a gadget went down one day out of every 100 for any reason, it would be judged to have 99 percent availability.

An inaccessible device might choke the entire network traffic because device availability is practically identical to network uptime. A single component’s failure or poor performance can create bottlenecks that slow networks down significantly.

Standard Network Devices

  • Routers Connect the networks. For example, connecting a private network to the Internet. A router acts as a dispatcher, deciding which path information should travel. Routers are devices that allow people to connect to the Internet. Routers are Layer 3 devices that communicate with each other.
  • Switches Connect the networks. For example, connecting a private network to the Internet. A router acts as a dispatcher, deciding which path information should travel. Routers are devices that allow people to connect to the Internet. Routers are Layer 3 devices that communicate with each other.
  • Firewalls Protect networks. Incoming and outgoing traffic is controlled by rules implemented by a firewall. This protects the link between a trustworthy private network and a public network like the Internet.
  • Servers Networks deliver programs and information to users. Applications and data are stored on servers. A server is a replica of a running application. Servers acknowledge and reply to user requests. When you visit a website, for example, a webserver “serves” webpages to your local device. Other sorts of servers include email servers and database servers.

Network Hardware Monitoring

Companies that manage datacenters or run on-premises workloads must guarantee that the physical gear that network traffic flows through is in excellent operating order. The physical, datalink, and network layers are usually included in the OSI model (layers 1, 2, and 3). This device-centric method of monitoring covers components for transmitting data, such as cables, as well as network equipment, such as routers, switches, and firewalls. A network device may communicate with other devices via many interfaces, and network failures can occur at any of these interfaces.

Functions of Network Monitoring 

Network device monitoring performs the following functions:

  • Discover
  • Map
  • Monitor
  • Alert
  • Report

Discover The discovery phase of network monitoring is the first stage. The routers, switches, firewalls, servers, printers, and other devices on the network are all discovered by network monitoring systems. Simply said, you can’t monitor the internet until you know what’s on it and how it’s all connected.

Map The administrator’s most essential diagnostic tool is his or her eyes. Visualizing their networks can make troubleshooting network problems much easier for them. Network monitoring software creates network maps to help network managers visualize their networks. Network maps provide a visual representation of the devices on the internet, their connections, and their current status.

Monitor Network management systems provide network managers with a wide range of monitor options. Our Network Monitoring Software comes with pre-defined device roles that define what is being watched. It allows administrators to change or establish new device roles as needed. As a starting point, network managers should monitor the “big five” for any device on the network. Ping availability and latency, as well as CPU, memory, disc, and interface use, are examples.

Other hardware components, such as fans and power supply in switches, and even the temperature in a wiring closet, are frequently monitored by network monitoring software. They can also keep track of HTTP, TCP/IP, and FTP services.

Alert Network Monitoring Systems notify administrators when something goes wrong. Email, SMS, and logging are all used to send alerts.

Network administrators can utilize the threshold-based alerting capability to respond to problems before they affect users, apps, or the company. Before the router fails, administrators can examine and respond. The NMS, for example, is set to emit an alarm whenever the CPU use surpasses 80%.

Performance indicators like CPU, memory, and interface are used later during the day. During peak usage periods, the thresholds may be surpassed for a few seconds or minutes. The network administrator prefers not to be troubled by minor hiccups. To avoid this, NMS notifications are configured with a time element.

Report Network administrators are constantly developing, assessing, and redesigning networks. For this life cycle, NMS systems provide real-time and historical monitoring data. Administrators can use this information to:

  • Validate network architectures that produce the expected outcomes.
  • Recognize trends that may influence the network’s capacity to deliver the performance that users, apps, and enterprises want.
  • Determine and correct performance issues.
  • Demonstrate that the network meets SLAs.

Why are Network Monitoring Tools Essential?

Businesses require networks, whether they are on-site or remote. Monitoring software is essential for:

  • Ensure uninterrupted business operations by ensuring continual network uptime and optimum health.
  • Every network device and interface’s performance, as well as their hierarchy, is revealed.
  • At the machine and interface levels, execute performance metrics.
  • Early detection of threats.
  • Alerts can help you reduce downtime.
  • Real-time network monitoring software that supports several vendors, is cloud-based, and scalable can keep a watch on your network 24 hours a day, seven days a week, and help you avoid disruptions. Its high availability techniques enable it to continuously monitor your network.

Live Monitoring

Most people consider live issue tracking to be the most important aspect of network monitoring. Remember that when it comes to network device monitoring, we’re more concerned with the status of switches and routers than with traffic flow.

When implementing network device monitoring, the goals of network performance monitoring and network traffic analysis become a little muddled because the statistics produced in the device management console include factors like device CPU and memory capacity and utilization, as well as the capacity and throughput of each port.

Although a network device monitor can measure network traffic capacity, the most significant aspects to consider with this type of monitor are all of the services and components of a switch or router that could go wrong. This includes operating system operations, which can start processes that ultimately hang or are abandoned.

A way of tracking difficulties within each piece of equipment considerably aids network device monitoring. This can be deployed as notifications in a monitoring tool’s dashboard. The majority of network performance monitors include the ability to set up an alert forwarding mechanism.

Because you don’t have to assign someone to sit and watch the monitoring tool’s dashboards for an alarm, the alerting system allows for unattended network monitoring. The notification will direct personnel back to the monitoring system and provide details on a network device fault that has been observed.

Throughput statistics are also collected by network performance monitors, and any of these measurements can have thresholds applied to them. If certain levels are exceeded, notifications are sent out. This allows you to address capacity concerns before they result in packets being lost or delayed. If you use time-sensitive apps like video conferencing or VoIP, this is very crucial.

Simple Network Management Protocol

The ideal approach for monitoring network devices is to use the Simple Network Management Protocol (SNMP). SNMP stands for Simple Network Management Protocol. It offers a common report message format as well as processes for obtaining reports from all network devices.

Every manufacturer of network devices puts an SNMP agent on each piece of equipment since the SNMP system is so widely respected. This function is frequently disabled by default. However, this means that installing SNMP on your network requires almost no effort. The issue is that you are most likely missing an SNMP Manager. Most of the functionality of network performance monitors is implemented by acting as an SNMP Manager.

The Management Information Base is the standard reporting format in SNMP (MIB). This is a text-based layout with a code for each reporting value that, when dereferenced, generates a tree structure. An SNMP agent continuously examines the device hosting it for problems. Daily static information fields, such as make and model, are also included in the MIB.

The SNMP reporting process is triggered by a request that is sent out by the SNMP Manager. Because the request is broadcast, the SNMP Manager does not need to know the addresses of any of the devices on the network.

Because the SNMP Agent is installed on a network device, it receives all broadcast traffic. When the Agent detects an SNMP request, it sends back its current MIB. In the monitor’s console, the operational data becomes live activity readouts.

The “autodiscovery” function included in most network performance monitors is provided by the SNMP MIB. The monitor may assemble an asset inventory and create a network topology map using the information on the device, all of its active ports, and the device connected to each port.

The activity data displayed in the console is always up to date because the request and response cycle repeats itself. A network performance monitor will collect reports for each statistic and utilize them to create time-series graphs. Because the monitor is queried repeatedly, any network device that is added moved, or removed will be immediately detected and updated in the asset inventory and network map.

If an agent identifies a major problem, it does not need to wait for a MIB to be sent out via the SNMP protocol. A MIB is sent out in response to high severity concerns, and this proactive communication is known as a Trap. Trap messages are translated into alarms by network performance monitors.

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