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Question 356 - N10-008 discussion

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A network administrator is investigating a network event that is causing all communication to stop. The network administrator is unable to use SSH to connect to the switch but is able to gain access using the serial console port. While monitoring port statistics, the administrator sees the following:

Which of the following is MOST likely causing the network outage?

A.
Duplicate IP address
Answers
A.
Duplicate IP address
B.
High collisions
Answers
B.
High collisions
C.
Asynchronous route
Answers
C.
Asynchronous route
D.
Switch loop
Answers
D.
Switch loop
Suggested answer: D

Explanation:

The question describes a scenario where a network event is causing all communication to stop,and the network administrator can only access the switch using the serial console port, not SSH.This suggests that the problem is related to the network layer or below, as SSH operates at theapplication layer and requires network connectivity to function.The port statistics show a huge discrepancy between the total receive and transmit rates, aswell as the unicast and broadcast/multicast packets per second. This indicates that there is a lotof traffic being generated and forwarded within the network, but not reaching the intendeddestinations. The most likely cause of this excessive traffic is a switch loop, which occurs when there aremultiple paths between switches that create a circular flow of data. Switch loops can causebroadcast storms, MAC address table instability, and network congestion, leading to networkoutages.To verify this, the network administrator should use a tool such as Spanning Tree Protocol(STP), which is designed to prevent and detect switch loops by blocking redundant links andelecting a root bridge. STP can also provide information about the topology and status of thenetwork, such as the root port, designated port, and blocked port for each switch.Reference:CompTIA Network+ N10-008 Study Guide, Chapter 2, Section 2.3, Switching Technologies, page741Professor Messer's CompTIA N10-008 Network+ Course Notes, Section 2.3, SwitchingTechnologies, page 132Professor Messer's CompTIA N10-008 Network+ Training Course, Video 2.3 - SwitchingTechnologies, 12:00 - 14:003

asked 02/10/2024
Said Bouzardaoui
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