An ISP operates a network that provides VPN service to enterprise customers. The customer uses
an MPLS network that is designed with redundant equal cost paths in the core. An enterprise
customer reported an increased latency and drop rate for some traffic flows from site A to site B.
The enterprise customer is connected to PE-A at site A and PE-B at site B.
If the latency problem is caused by a congested link in the core along a path from site A to site B,
which of the following statements is correct?
A.
Issuing a traceroute from PE-A to PE-B would definitely identify the congested link.
B.
Checking the CPU utilization of the routers along the path of the traffic would help identify the
congested link.
C.
Issuing a traceroute from PE-A to PE-B may not be able to identify the congested link, because
traffic from PE-A to PE-B uses multiple paths.
D.
Performing a sweep ping from PE-A to PE-B and from PE-B to PE-A with DF bit set would
definitely identify the congested link.
E.
Issuing ping with record route and time stamp option from PE-A to PE-B and from PE-B to PE-A
would definitely identify the congested link.