Network Troubleshooting

What can cause connectivity issues with Wi-Fi

Physical obstructions or electronic interference

What tool measures signal strength and dead zones

Wi-Fi analyzer

What can remedy unstable wireless connection even after restarting the system

Update the wireless adapter drive

What steps can help resolve intermittent wireless connectivity caused by interference

Switching frequency bands or changing the wireless channel

What can cause speed transfer limitations

Older cabling not supporting the higher transfer rates

What symptoms indicate a slow network is caused by congestion

Slowness is noticeable across multiple devices and only during busy periods

What can cause high latency and lag spikes

Background processes or applications

What is the cause of limited network connectivity on a device in the 169.254.x.x IP range

DHCP

What action should you take to troubleshoot a limited connectivity in Windows with no active network connection

Verify network adapter status and check physical network connection

What is the problem if you can ping an IP address but not the domain name

DNS

What is variation in packet delay

Jitter

What network application types are most sensitive to jitter

Real-time

What can cause a VoIP call to hear your own voice with a slight delay

High latency

What causes choppy or distorted audio during a VoIP call

Jitter

What is the primary purpose of a jitter buffer in VoIP systems

To even out packet delays

What is the condition where a network port light rapidly alternates between up and down states loosing and regaining connection

Port Flapping

What is the primary causes of port flapping

1. Mismatched speed and duplex settings

2. Loose, faulty, or unsupported cabling

Network issues directly linked to port flapping

Intermittent connectivity and degraded data transfer speeds

What is the first step to take when troubleshooting port flapping

Check physical connections

What conditions lead to increased latency

Network congestion

Physical distance

Wireless interference and signal degradation

Outdated or inefficient network hardware

What solutions decrease network latency

1. Using wired connections

2. Reducing network congestion

3. Reducing physical distance

4. Upgrading hardware

What cabling is most susceptible to external interference

UTP

What cabling provides immunity against external interference

Fiber optic

What can result in a network authentication failure even if username and password are correct

1. Expired user password

2. User account locked out

3. Disabled or deleted user account

4. Time synchronization issues

What do you do if you realize the issue is on the WAN side

Contact the ISP