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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)

  • show interfaces gi0/1 (correct)
  • show interfaces gi0/2
  • show interfaces gi0/1 status (correct)
  • show ip interface brief

What is wrong with the fa0/1 interface if there is a duplex mismatch?

<p>A duplex mismatch exists with the device on the other end of the connection.</p> Signup and view all the answers

What does a significant number of runts on the Gi0/1 interface indicate?

<p>Collisions are occurring.</p> Signup and view all the answers

Which interface statistic displays the number of collisions that occurred after the 64th byte of the frame was transmitted?

<p>Late collisions</p> Signup and view all the answers

What are the most likely causes of a significant number of CRC errors? (Select two)

<p>Collisions causing frame corruption (B), EMI or cross-talk on the UTP cabling (C)</p> Signup and view all the answers

What command should you use to configure full-duplex communication at 100 Mbps for a port on a Cisco switch?

<p>duplex full</p> Signup and view all the answers

What should you do to carry VLAN traffic for VLAN 2 from SwitchA to SwitchB?

<p>For Fa0/1 on SwitchA, set the switchport mode to dynamic desirable.</p> Signup and view all the answers

Which command displays whether interface FastEthernet 0/2 is a member of VLAN0002?

<p>show vlan brief</p> Signup and view all the answers

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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.
  • Command for Collision Analysis: Use show interfaces gi0/1 to 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
  • 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.
  • 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

  • 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 desirable to allow VLAN traffic to pass correctly.

VLAN Membership Verification

  • Use the command show vlan brief to 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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