5.0 Network+ Certification Cram Notes : Network Troubleshooting

5.5 Explain the following considerations with respect to troubleshooting general networking issues.

Host-based/network-based firewall settings

Network performance issues refer to any issues that negatively impact the speed or efficiency of network operations. This can include issues such as high latency, low bandwidth, or frequent dropped packets.

Host-based or network-based firewall settings can impact network functionality if they are too restrictive or not configured correctly. This can include issues such as blocked services, ports, or addresses, which can prevent devices from communicating with each other.

Blocked services, ports, or addresses can also impact network functionality if they are not configured correctly. This can include issues such as being unable to access specific websites or services, or unable to use certain applications.

Incorrect VLAN assignments can lead to network segmentation and impact network performance. If a device is assigned to the wrong VLAN, it may not be able to communicate with other devices on the network.

DNS issues can impact the ability of devices to access resources on the network. For example, if the DNS server is not configured correctly, devices may not be able to access websites or other network resources.

NTP issues can impact the accuracy of time on devices, which can lead to issues with applications or services that depend on accurate timekeeping.

BYOD challenges refer to the challenges associated with supporting a bring-your-own-device policy in a corporate network. This can include issues such as ensuring device security, managing device configurations, and ensuring network compatibility with a variety of devices.

Licensed feature issues can occur if network devices are not properly licensed or if licenses have expired. This can prevent the use of certain features or functions on the network.

Network performance issues can be defined as the issues that occur in a network that affects its overall performance and efficiency. Some common network performance issues are:

1. Slow network speeds - This issue occurs when the network speed is not meeting the expected performance standards. It could be due to the slow internet connection, outdated network hardware, or network congestion.

2. Latency - Latency refers to the time it takes for a packet of data to travel from one point in the network to another. High latency can cause slow or delayed responses, especially in real-time applications like online gaming and video conferencing.

3. Packet loss - Packet loss occurs when data packets are not successfully transmitted from one point to another. This can result in dropped connections, slow network performance, and data corruption.

4. Congestion - Congestion occurs when there is too much data traffic on the network, causing slowdowns and delays. It can be caused by too many devices connected to the network, high network usage, or network misconfigurations.

5. Interference - Interference can occur when other electronic devices emit signals that interfere with the normal functioning of the wireless network. This can cause slowdowns, dropped connections, and poor signal quality.

These performance issues can be resolved by using various tools and techniques, such as network monitoring, bandwidth analysis, and hardware upgrades. It is also important to keep the network updated with the latest software and hardware updates to prevent performance issues from occurring.

Overall, troubleshooting network issues requires a comprehensive understanding of network configurations, protocols, and behaviors. The use of appropriate software tools, command line utilities, and network monitoring can be critical in resolving issues and restoring normal network operations.