S24 - Network Troubleshooting Flashcards
2 Main methods of checking if your NIC is working
Network cable tester & Look at back of NIC card: 3 lights will be there:
1) lack of link light, there is a physical issue somewhere along the path)
2) activity light will blink when sending and receiving data
3) present in some cards, will display what speed the card is running at, off if 10mbps, orange if 100mbps, green if 1000mbps
What piece of equipment can be used for extending the line
Repeater, increases the signal
Recommended type of cable if running past power lines, generators erc
Fibre, not twisted copper cable
Define Port Flapping
Caused by an intermittent connectivity issue between the client and network switch
Flapping status is
is constant switching of upstate to downstate
4 Main cable issues
Physical connection
Cable length
Interference
Port flapping
Define network performance issues
Manifesting the slow down of network
Define half duplex
Network that sends or receive information, Not both at the same time
Give an example of half duplex
Walky-talky communication
Define full-duplex
Network that sends or receives information at the same time
What mode are NICs set to in terms of half and full dupex
auto negotiation
Define data exfiltration
Sending data in the background without the user seeing it
4 things that can cause network connectivity issues
Mismatch in duplex settings
Mismatch in speed setting
Network adapter drivers are out of date
Malware Infection
3 Main groups for network troubleshooting to consider
Is this:
Single Client, Network segment or Entire Network
If single client issue we need to look at
Individual duplex settings, speed settings, network adapter drivers, malware
