NE NE Network Troubleshooting

Question 1

What is the correct order of the OSI model troubleshooting approach when using a bottom-up method?

Accepted Answer

Physical → Data Link → Network → Transport → Application

Answer

Application → Transport → Network → Data Link → Physical

Answer

Network → Physical → Application → Transport → Data Link

Answer

Transport → Network → Data Link → Physical → Application

Question 2

Which command verifies end-to-end IP reachability between two hosts?

Accepted Answer

ping

Answer

traceroute

Answer

netstat

Answer

ipconfig

Question 3

What does a high number of CRC errors on a switch interface typically indicate?

Accepted Answer

Physical layer issues such as bad cable, duplex mismatch, or faulty NIC

Answer

A routing loop in the network

Answer

An overloaded routing table

Answer

An incorrect VLAN assignment

Question 4

A user cannot access a remote server but can ping the default gateway. What is the most likely issue?

Accepted Answer

Routing or firewall issue between the user's network and the server's network

Answer

The user's NIC is faulty

Answer

The user has an incorrect subnet mask

Answer

The switch port is in the wrong VLAN

Question 5

What tool is used to identify the path packets take from a source to a destination and detect where delays occur?

Accepted Answer

traceroute / tracert

Answer

ping

Answer

nslookup

Answer

netstat

Question 6

A duplex mismatch between a switch port and a connected device will cause which symptom?

Accepted Answer

High number of late collisions and poor throughput

Answer

Complete loss of connectivity

Answer

Increased broadcast traffic

Answer

VLAN membership errors