Network users complain that the network is running very slowly. Upon investigation, a network technician discovers 100% link utilization on all the network devices. Also, numerous syslog messages are being generated that note continuous MAC address relearning. What is the most likely cause of the problem?

IT Questions BankCategory: CCNPNetwork users complain that the network is running very slowly. Upon investigation, a network technician discovers 100% link utilization on all the network devices. Also, numerous syslog messages are being generated that note continuous MAC address relearning. What is the most likely cause of the problem?
Network users complain that the network is running very slowly. Upon investigation, a network technician discovers 100% link utilization on all the network devices. Also, numerous syslog messages are being generated that note continuous MAC address relearning. What is the most likely cause of the problem? 1Administrator Staff asked 3 months ago

Network users complain that the network is running very slowly. Upon investigation, a network technician discovers 100% link utilization on all the network devices. Also, numerous syslog messages are being generated that note continuous MAC address relearning. What is the most likely cause of the problem?

  • The routing protocol has been misconfigured and a routing loop is evident.
  • A Layer 2 STP looping condition is present.
  • The dynamic routing protocol has not yet converged the network.
  • An incorrect encapsulation has been configured on one of the trunks that connect a Layer 2 device to a Layer 3 device within the affected segment.
  • Keepalives are expected but do not arrive.

Explanation: High CPU consumption and low free memory space are common symptoms of a Layer 2 forwarding loop. In Layer 2 forwarding loops, besides constantly consuming switch bandwidth, the CPU spikes as well. As the packet is received on a different interface, the switch must move the MAC address from one interface to the next. The network throughput is impacted drastically, users will probably notice a slow-down on their network applications, and the switches might crash because of an exhausted CPU and low memory resources.

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