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Questions and Answers
What is the problem when users of the workstations attached to a hub are experiencing erratic pings?
What is the problem when users of the workstations attached to a hub are experiencing erratic pings?
Duplex mismatch
Which command should you use to view and analyze the number of collisions detected on the Gi0/1 interface?
Which command should you use to view and analyze the number of collisions detected on the Gi0/1 interface?
show interfaces gi0/1
Which commands could you use to determine the duplex settings configured on the Gi0/1 interface? (Select two)
Which commands could you use to determine the duplex settings configured on the Gi0/1 interface? (Select two)
What is wrong with the fa0/1 interface if there is a duplex mismatch?
What is wrong with the fa0/1 interface if there is a duplex mismatch?
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What does a significant number of runts on the Gi0/1 interface indicate?
What does a significant number of runts on the Gi0/1 interface indicate?
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Which interface statistic displays the number of collisions that occurred after the 64th byte of the frame was transmitted?
Which interface statistic displays the number of collisions that occurred after the 64th byte of the frame was transmitted?
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What are the most likely causes of a significant number of CRC errors? (Select two)
What are the most likely causes of a significant number of CRC errors? (Select two)
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What command should you use to configure full-duplex communication at 100 Mbps for a port on a Cisco switch?
What command should you use to configure full-duplex communication at 100 Mbps for a port on a Cisco switch?
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What should you do to carry VLAN traffic for VLAN 2 from SwitchA to SwitchB?
What should you do to carry VLAN traffic for VLAN 2 from SwitchA to SwitchB?
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Which command displays whether interface FastEthernet 0/2 is a member of VLAN0002?
Which command displays whether interface FastEthernet 0/2 is a member of VLAN0002?
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Study Notes
Troubleshooting Switch Interfaces
- Duplex Mismatch: Occurs when devices at either end of a connection are set to different duplex modes (e.g., one full-duplex and the other half-duplex). Leads to erratic behavior and performance issues.
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Command for Collision Analysis: Use
show interfaces gi0/1to view and analyze the number of collisions detected on a specific interface.
Checking Duplex Settings
- To determine duplex settings of an interface, use:
-
show interfaces gi0/1 status -
show interfaces gi0/1
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- These commands provide information on the operational state and configuration of the interface.
Analyzing Interface Output
- Fa0/1 Interface Issues: If a duplex mismatch is present, it creates connectivity problems with devices at the other end.
- Runts Indication: A high number of runts on an interface indicates collisions are occurring.
Interface Collision Statistics
- Late Collisions: This statistic reflects the number of collisions occurring after the transmission of the first 64 bytes of a frame, indicating potential issues in transmission quality.
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CRC Errors Causes:
- Electromagnetic Interference (EMI): Environmental interference affecting UTP cabling can corrupt frame data.
- Collisions: Collisions can lead to corrupted frame contents arriving at the interface.
Interface Configuration and Commands
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Setting Interface Duplex: To set a port to full-duplex at 100 Mbps, execute the command
duplex full. -
Switching Modes: For VLAN traffic issues between switches, ensure proper switchport modes; set Fa0/1 on SwitchA to
dynamic desirableto allow VLAN traffic to pass correctly.
VLAN Membership Verification
- Use the command
show vlan briefto verify VLAN membership and check which interfaces are included in a specific VLAN. Display includes VLAN ID, name, status, and associated ports.
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