2. 计算机
  3. Ezonexam users have noticed extremely slow network performance, intermittent connectivity, and connection losses. After entering

Ezonexam users have noticed extremely slow network performance, intermittent connectivity, and connection losses. After entering

admin2009-05-19  69
问题 Ezonexam users have noticed extremely slow network performance, intermittent connectivity, and connection losses. After entering the "show interfaces" command, you notice that the Ethernet interface is configured as 100 Mbps full-duplex and that there is evidence of late collisions. What could be the cause of this problem?
A. Duplex mismatch
B. A routing loop
C. Trunking mode mismatch
D. Improperly configured root bridge
E. Improperly configured static VLAN
F. None of the above
选项
答案A
解析 Explanation:
A duplex mismatch may result in performance issues, intermittent connectivity, and loss of communication. When troubleshooting NIC issues, verify that the NIC and switch are using a valid configuration. Some third-party NIC cards may fall back to half-duplex operation mode, even though both the switchport and NIC configuration have been manually configured for 100 Mbps, full-duplex.

This behavior is due to the fact that NIC autonegotiation link detection is still operating when the NIC has been manually configured. This causes duplex inconsistency between the switchport and the NIC. Symptoms include poor port performance and frame check sequence (FCS) errors that increment on the switchport.

To troubleshoot this issue, try manually configuring the switchport to 100 Mbps, half-duplex. If this action resolves the connectivity problems, you may be running into this NIC issue. Try updating to the latest drivers for your NIC, or contact your NIC card vendor for additional support.
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