Question 1,692 of 2,152

Route Maps and Route Filtering →mediumMultiple ChoiceObjective-mapped

Route Tags in Redistribution

This 300-410 practice question tests your understanding of route maps and route filtering. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.

A network engineer runs the following command to verify redistribution with route-maps:

R1# show ip route 10.10.10.0 255.255.255.0

Routing entry for 10.10.10.0/24 Known via "eigrp 100", distance 170, metric 2560002816 Tag 100, type internal Last update from 10.1.1.2 on GigabitEthernet0/0, 00:00:45 ago Routing Descriptor Blocks:

* 10.1.1.2, from 10.1.1.2, 00:00:45 ago, via GigabitEthernet0/0

Route metric is 2560002816, traffic share count is 1 Total delay is 2000 microseconds, minimum bandwidth is 100000 Kbit Reliability 255/255, minimum MTU 1500 bytes Loading 1/255, Hops 1

What does the 'Tag 100' indicate?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

A
The route was originated by EIGRP autonomous system 100.
Why wrong: The EIGRP AS is shown as 'eigrp 100', but the Tag field is separate and set by a route-map.
B
The route has a tag of 100, likely set by a route-map during redistribution.
The 'Tag 100' is a route tag, commonly set by a route-map to mark routes for filtering or administrative purposes.
C
The route is internal to EIGRP and has a metric of 100.
Why wrong: The metric is 2560002816, not 100. Tag and metric are different fields.
D
The route is from a BGP AS 100.
Why wrong: The route is learned via EIGRP, not BGP.

Full breakdown with real-world context →

Quick Answer

The answer is that Tag 100 indicates a route tag of 100, likely set by a route-map during redistribution. This tag is a 32-bit value attached to the route entry, visible in the `show ip route` output, and is commonly used for filtering or administrative marking when redistributing routes between different routing protocols. In the Cisco CCNP ENARSI 300-410 exam, route tags in redistribution verification are a key concept for controlling routing updates and preventing routing loops, especially in complex multi-protocol environments. A common trap is confusing the route tag with the administrative distance or metric; the tag is purely a marker, not a path-selection value. Remember that tags are set via route-map commands like `set tag 100` and can be matched later with `match tag` for filtering. Memory tip: think of a tag as a “sticky note” on the route—it doesn’t change the route’s behavior, but it lets you sort or filter it later.

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 route has a tag of 100, likely set by a route-map during redistribution.

The 'Tag 100' indicates that a route-map applied during redistribution set the tag to 100. Route tags are often used for filtering or administrative purposes during redistribution.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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 route was originated by EIGRP autonomous system 100.
Why it's wrong here
The EIGRP AS is shown as 'eigrp 100', but the Tag field is separate and set by a route-map.
✓
The route has a tag of 100, likely set by a route-map during redistribution.
Why this is correct
The 'Tag 100' is a route tag, commonly set by a route-map to mark routes for filtering or administrative purposes.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The route is internal to EIGRP and has a metric of 100.
Why it's wrong here
The metric is 2560002816, not 100. Tag and metric are different fields.
✗
The route is from a BGP AS 100.
Why it's wrong here
The route is learned via EIGRP, not BGP.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Trap categories for this question

Command / output trap
The EIGRP AS is shown as 'eigrp 100', but the Tag field is separate and set by a route-map.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.

TExam Day Tips

Underline the problem statement mentally.
Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.

Quick reference

Routing Protocol Comparison

Protocol	Metric	Max Hops	Algorithm	Type
RIP v2	Hop count	15	Bellman-Ford	Distance vector
OSPF	Cost (bandwidth)	Unlimited	Dijkstra (SPF)	Link state
EIGRP	Composite metric	Unlimited	DUAL	Hybrid
IS-IS	Cost	Unlimited	Dijkstra	Link state
BGP	Policy / attributes	Unlimited	Path vector	Path vector

RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.

What to study next

Got this wrong? Here's your next step.

Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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FAQ

Questions learners often ask

What does this 300-410 question test?

Route Maps and Route Filtering — This question tests Route Maps and Route Filtering — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The route has a tag of 100, likely set by a route-map during redistribution. — The 'Tag 100' indicates that a route-map applied during redistribution set the tag to 100. Route tags are often used for filtering or administrative purposes during redistribution.

What should I do if I get this 300-410 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Same concept, more angles

1 more ways this is tested on 300-410

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A network engineer runs the following command to troubleshoot redistribution with route-maps: R1# show ip route summary IP routing table name: Default-IP-Routing-Table(0) IP routing table maximum-paths: 32 Route Source Networks Subnets Replicates Overhead Memory (bytes) connected 0 3 0 0 480 static 0 0 0 0 0 ospf 1 2 5 0 0 1280 eigrp 100 1 2 0 0 640 bgp 65000 0 0 0 0 0 internal 2 Total 3 10 0 0 2400 What does this output indicate?

medium

✓ A.BGP is not receiving any routes, possibly due to filtering.
B.EIGRP is redistributing routes into OSPF.
✓ C.OSPF has more routes than EIGRP.
D.The router has a total of 13 routes.

Why A: The output shows that BGP has zero routes, indicating BGP is not receiving any routes, possibly due to filtering. This is the most significant finding for troubleshooting redistribution. While OSPF does have more routes than EIGRP numerically, that is not directly indicative of redistribution issues and is not the primary takeaway.

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