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300-410 Practice Question: Which TWO statements about PBR and the 'set ip…
Which TWO statements about PBR and the 'set ip tos' command are true? (Choose TWO.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The 'set ip tos' command can use keywords such as 'min-delay', 'reliability', 'throughput', and 'low-cost' to set the ToS value.
PBR can modify the Type of Service (ToS) field in the IP header using 'set ip tos'. The ToS value can be specified as a decimal number (0-255) or using predefined keywords like 'min-delay', 'reliability', 'throughput', etc. The command affects only the ToS byte, not the entire DSCP field, though DSCP can be set using 'set ip dscp'. The ToS change is applied to packets that match the route-map permit sequence.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The 'set ip tos' command can use keywords such as 'min-delay', 'reliability', 'throughput', and 'low-cost' to set the ToS value.
Why this is correct
Correct. These keywords correspond to standard ToS values (e.g., min-delay = 8, reliability = 4, etc.).
- ✗
The 'set ip tos' command modifies the entire DSCP field in the IP header.
Why it's wrong here
Incorrect. 'set ip tos' modifies the ToS byte, which includes the DSCP field but also the ECN bits; however, it is not recommended to use 'set ip tos' for DSCP marking—use 'set ip dscp' instead.
- ✗
The 'set ip tos' command can be used in a route-map sequence with a 'deny' keyword to mark packets that are not policy-routed.
Why it's wrong here
Incorrect. 'set' commands are only applied in permit sequences; deny sequences do not execute set actions.
- ✗
The 'set ip tos' command is applied to all packets that match the route-map, regardless of whether the packet is policy-routed or forwarded normally.
Why it's wrong here
Incorrect. The ToS marking is applied only to packets that are policy-routed (i.e., matched by a permit sequence and the set actions are executed).
- ✓
The 'set ip tos' command can be verified using 'show route-map' to display the configured ToS value.
Why this is correct
Correct. 'show route-map' displays the set actions configured, including 'set ip tos' values, allowing verification.
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Written by Johnson Ajibi, MSc IT Security
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