Lesson 7 - Chapter 3: Internet Troubleshooting

Question 1

“No connectivity” has what 2 meanings?

Answer 1

1. A disconnected NIC
2. Inability to connect to a resource

Question 2

For this scenario, you’re on the Internet but can’t get to a website. What’s the first question you ask and how do you proceed?

Answer 2

Can you get to other websites? If not, go back and triple-check local connectivity

Question 3

For this scenario, you’re on the Internet but can’t get to a website. What’s the second question you ask and how do you proceed?

Answer 3

Can you ping the site? Try pinging the URL

C:>ping www.cheetos1.com

Question 4

If your computer fails to ping the URL of a website, what does that tell us?

Answer 4

the computer can’t get an IP address for that website which points to a DNS failure (a very common problem)

Question 5

How do you fix a failing DNS? (3 steps)

Answer 5

1. Command Prompt: ipconfig /flushdns
2. Network and Sharing Center > Change Adapter Settings in CP > Right click network > Diagnose
3. Try using another DNS server (lots open to the public)

Question 6

Limited connectivity points to what kind of problem?

Answer 6

DHCP problem (assuming you’re connected to a DHCP server)

Question 7

How do you troubleshoot limited connectivity? (3)

Answer 7

1. Run ipconfig and see if you have an APIPA address
2. Try restarting the router if your router is your DHCP server
3. Try setting up your NIC statically (need Network ID and default gateway IP address)

Question 8

What does local connectivity mean?

Answer 8

You can access network resources but not the Internet

Question 9

Local connectivity points to what? (2)

Answer 9

a downed DHCP server since all local systems will have an APIPA/link-local address
Or
a problem with the router

Question 10

What’s the first thing you do to troubleshoot local connectivity with a downed DHCP server? (2)

Answer 10

1. ping the default gateway
2. if success, ping the other (WAN) port on the router (IP address is found on router’s configuration web page)

Question 11

After the initial 2 step sets to troubleshoot local connectivity, what else can you do? (3)

Answer 11

1. Renew or Release/Renew your DHCP address using the router’s configuration (like Release IP)
2. If not, reset the broadband modem/terminal adapter
3. If not, call the ISP

Question 12

When everyone is getting slow Internet connectivity, what should you check?

Answer 12

the router (but probable that too many people need too much bandwidth so go buy more)

Question 13

What is QoS? Where can you find it?

Answer 13

Quality of Service

a router feature that prioritizes access to network resources for certain users, applications or services when there isn’t enough bandwidth to go around