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.
300-410 Route Maps and Route Filtering Practice Question
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.
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: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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
Static NAT maps one inside address to one outside address.
✗
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.
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
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
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
Route Maps and Route Filtering — This question tests Route Maps and Route Filtering — Static NAT maps one inside address to one outside address..
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?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
About these practice questions
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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 a summary of the IP routing table, listing the number of networks and subnets from each routing source. It indicates that OSPF and EIGRP are contributing routes, while BGP has no routes.
Last reviewed: Jun 18, 2026
Question Discussion
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