M845: WAN Troubleshooting Flashcards
You have a WAN circuit down and you call the service provider to assist with troubleshooting. Luckily the service provider has a ______________installed, so they are able to test the circuit remotely and identify the problem.
A. Router
B. Circuit ID
C. CPE
D. Smart Jack
D. Smart Jack
Explanation: A Smart Jack is a device installed on the customer side of a WAN circuit that allows the service provider to run diagnostics and confirm if the circuit itself is functioning optimally.
When calling in trouble on a WAN circuit to a service provider what information do you need at the least in order to identify the circuit to the provider?
A. Router
B. Circuit ID
C. CPE
D. Smart Jack
B. Circuit ID
Explanation: You should always have the Circuit ID handy when calling in trouble on a WAN circuit. This is how the service provider will be able to quickly identify which circuit you are calling about.
A WAN Circuit from a service provider comes into a company facility at the Demarc and then connects to the customer premise equipment that is installed in the ___________.
A. MDF
B. Demarc
C. IDF
D. Smart Jack
A. MDF
Explanation: The MDF (Main Distribution Frame) is the equipment room in which the main customer equipment is located which normally includes the customer edge router and other customer premise equipment that interfaces with the connection from the service provider that comes from the Demarc.
Your company is experiencing a WAN outage on a T1 line. Working with the service provider you set a hard loopback on a T1 line using a Loopback plug on the CSU/DSU device. The loopback tests good all the way to the CSU/DSU and the service provider informs you that the WAN circuit is up and running just fine. Since the WAN connection is still not coming online to your equipment you test the cable that runs between the Demarc and the MDF. The cable tests good, so now you know the problem likely resides at the ___________________.
A. WAN Circuit
B. Provider Edge Equipment
C. Customer Edge Router
D. Smart Jack
C. Customer Edge Router
Explanation: In this scenario the circuit was deemed tested and good to go by the service provider. In that case you would begin looking toward the customer premise equipment for the problem beginning with testing the cable that connects the customer equipment to the service provider. If the cabling also
tests good, then the next step is to have a look at the actual equipment to see if you can identify why the WAN outage is occurring. In most cases the next piece of equipment in line at the customer premise will be a router on the edge of the main network. To service providers, this type of router is referred to as a
Customer Edge Router. In this type of scenario the problem could be related to power, a problem with the router interface, or any number of issues with the router configuration.
You were recently involved with the installation of a new wireless controller and wireless access points that have robust security features and bandwidth throttling capabilities. Taking advantage of these features you have set the guest wireless network to allow only a low amount of bandwidth usage. You receive a ticket
from the helpdesk that includes the subject: “Internet Slow!!!! User is having problems streaming video from his iPhone via the wireless!!”. This is a sign of a problem on the company Internet WAN connection.
A. True
B. False
B. False
Explanation: Sometimes users can complain about slow connectivity to the internet, but the result is intended. It’s best not to allow guest users to bog down the company internet by doing things like streaming videos to their wireless devices for personal reasons. In the case of this scenario you intentionally set the guest wireless network to throttle down so the result is intended and is not a indication of a problem the company WAN or Internet connectivity.
