Cisco CCIE SP Operations Written

An ISP has an MPLS LDP core with redundant paths. The core is BGP-free and core routers do not participate in BGP protocol. Several Internet customers reported that they are not able to reach some Internet sites any
more. The set of sites reported as having reachability issues depends on the location of the customer. What is the most likely root-cause for this problem?

A L3VPN customer is connected to one of your PE routers by using OSPF as CE-PE protocol and was successfully exchanging VPN routes. It came to your attention that OSPF adjacency became stuck in
"EXCHANGE" state recently. What is the most likely cause for this issue?

According to ITIL

According to ITIL

What is the most effective tool to use to determine whether there is a physical layer problem with voice bearer trunks before escalating the trouble to the PSTN PTT carrier?

You are a Tier 3 NOC engineer. While reviewing Incident records, you find that support groups have not adhered to the escalation thresholds. These thresholds were based on the service level agreements with the
customer. The support groups believe that the escalation thresholds are too short or that they do not have reasonable time frames.
Which option should you recommend as an improvement to ensure adherence to the escalation thresholds?

According to ITIL

According to ITIL

Several related trouble tickets with complaints about poor network performance have been successfully resolved. The service provider NOC wants to ensure that these complaints do not continue. What should be the next step?

According to ITIL