- A
The 'set ip tos' command can use keywords such as 'min-delay', 'reliability', 'throughput', and 'low-cost' to set the ToS value.
Correct. These keywords correspond to standard ToS values (e.g., min-delay = 8, reliability = 4, etc.).
- B
The 'set ip tos' command modifies the entire DSCP field in the IP header.
Why wrong: 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.
- C
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 wrong: Incorrect. 'set' commands are only applied in permit sequences; deny sequences do not execute set actions.
- D
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 wrong: 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).
- E
The 'set ip tos' command can be verified using 'show route-map' to display the configured ToS value.
Correct. 'show route-map' displays the set actions configured, including 'set ip tos' values, allowing verification.
Quick Answer
The correct answer is that the 'set ip tos' command can be verified using 'show route-map' to display the configured ToS value. This is because Policy-Based Routing (PBR) allows you to modify the Type of Service byte in the IP header for matched packets, and the route-map configuration stores the ToS value as a decimal number (0-255) or a predefined keyword like 'min-delay' or 'throughput', which the 'show route-map' command then reveals. On the Cisco CCNP ENARSI 300-410 exam, this topic tests your understanding of how PBR can manipulate QoS markings at Layer 3, often appearing in a multiple-choice question that asks which two statements are true. A common trap is confusing 'set ip tos' with 'set ip dscp'—remember that ToS modifies only the original IP precedence bits, while DSCP uses a different field and requires a separate command. Memory tip: "ToS is the old-school byte; show route-map is your spy to see what you applied."
300-410 Policy-Based Routing (PBR) Practice Question
This 300-410 practice question tests your understanding of policy-based routing (pbr). Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.).
Related concept
Standard ACLs match source addresses.
- ✗
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.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Trap categories for this question
Command / output trap
Incorrect. 'set' commands are only applied in permit sequences; deny sequences do not execute set actions.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 300-410 ACL questions on filtering logic and placement.
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Policy-Based Routing (PBR) — study guide chapter
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FAQ
Questions learners often ask
What does this 300-410 question test?
Policy-Based Routing (PBR) — This question tests Policy-Based Routing (PBR) — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 300-410 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 300-410 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 18, 2026
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