Questions and Answers
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?
show interfaces gi0/1
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?
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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?
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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?
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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?
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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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