The network administrator has been tracking the cause of network performance problems and decides to take a look at the internal and external router stats. Which of the following should the network…

Question

Options

• AThe IP TOS field of business related network traffic should be modified accordingly.
• BThe TCP flags of business related traffic should be modified accordingly.
• CAn ACL should be placed on the external router to drop incoming ICMP packets.
• DAn ACL should be placed on the internal router to drop layer 4 packets to and from port 0.

• A
  78% (28)
• B
  11% (4)
• C
  8% (3)
• D
  3% (1)

Explanation

The IP Type of Service (TOS) field (now largely superseded by DSCP/DiffServ but conceptually the same) is used to implement Quality of Service (QoS) by marking packets so routers can prioritize critical business traffic over less important traffic. When router stats reveal performance degradation, adjusting QoS markings ensures business-critical flows receive appropriate bandwidth and lower latency. Modifying TCP flags would break protocol behavior, dropping ICMP on the external router would impair diagnostics without solving congestion, and dropping layer-4 traffic to/from port 0 addresses a minor anomaly rather than the core performance problem.

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