CAS-002 · Question #55
CAS-002 Question #55: Real Exam Question with Answer & Explanation
The correct answer is A: The IP TOS field of business related network traffic should be modified accordingly.. Network performance problems related to traffic prioritization are best addressed through Quality of Service (QoS). The IP Type of Service (TOS) field (now called DSCP) in the IP header is used to mark packets so routers can prioritize business-critical traffic over less importan
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.
Explanation
Network performance problems related to traffic prioritization are best addressed through Quality of Service (QoS). The IP Type of Service (TOS) field (now called DSCP) in the IP header is used to mark packets so routers can prioritize business-critical traffic over less important traffic (A). By correctly marking business traffic with the appropriate TOS/DSCP values, routers can queue and forward that traffic preferentially, resolving congestion-related performance issues. Modifying TCP flags (B) is not a QoS mechanism and could break connections. Dropping ICMP (C) would prevent diagnostics but not resolve underlying performance issues. Dropping port 0 packets (D) handles malformed packets but doesn't address general performance.
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