Troubleshooting Steps Flashcards
What are first 3 steps of the 7 step troubleshooting steps?
1) identify the problem (more accurately, the issue)
2) establish a theory of probably cause
3) test the theory to determine cause
What are steps 4. 5. 6 and 7 of the 7 troubleshooting steps?
4) establish a plan to resolve the problem
5) implement the solution
6) Verify the solution has worked and no new issues appear. Fix those issues
7) Document findings, actions and outcomes
Two devices using auto negotiation for duplex setting can still end up with duplex mismatch. TRUE or FALSE?
TRUE
what is the default duplex setting on switches and hosts?
Auto
what’s the command to check the MTU setting on a router interface?
show interface
when checking switch port for potential issues, what 3 things should be checked?
1) Speed
2) Duplex setting
3) type of cable
regarding issues with untrusted certificates, where are certificates stored on the local machine?
in the Trusted Root Certification Authorities Folder
list 3 reasons that would cause an SSL certificate to be invalid?
1) CA not found in trusted root certification authorities folder
2) Certificate expired or presented before the validity period starts!
3) name doesn’t match
incorrect time between machines will affect what 3 things?
1) Active Directory (5 mins difference will stop comms)
2) Certificates
3) Syslogs
when checking for blocked tcp/udp ports what command is used?
netstat -a
what’s the best way of controlling host-based firewall settings to prevent it causing access issues?
control them with a group policy
what is the disadvantage of the bottom-up approach to establishing a cause?
you have to check a lot of things!
if you can’t test a theory, and you’ve tried other theories, what do you then need to do?
escalate the problem
What is a symptom of STP convergence issue?
network goes down for a min, then comes back up again and repeats
Proxy ARP, missing routes, routing problems and routing loops would be escalated to which group?
the routing group
routing loops will typically occur on what two protocols?
RIP and RIPv2
when checking for routing loops/problems what can be easily be checked on the router?
the default route
MTU blackhole occurrs under what two conditions
1) when the MTU on an intermediate network segment is smaller than the max packet size of the communicating hosts
2) if ICMP is disabled on the routers as they can’t communicate about an MTU mismatch issue
When documenting the problem, what 5 things should you include?
(Des Violated Ruby Said Fanny)
Des Violated Ruby Said Fanny
1) description of issue
2) Version of OS/software/NIC
3) whether you could REPRODUCE the problem
4) Solutions tried
5) Final solution
Apart from the IP address and subnet mask and gateway, when checking for IP configuration issues on a workstation, what 5 things are good to check?
1) DNS
2) DHCP
3) WINS
4) HOSTS
5) Registry
when checking executable files troubleshooting potential software issue, what can you look out for?
lines that have been commented out and shouldn’t be like lines starting with # in the HOSTS file
