The answer is to define administrative groups for link inclusion or exclusion in MPLS TE path selection. This attribute, also known as link colors, allows you to assign user-defined properties to interfaces and then configure a tunnel to include or exclude links matching those properties, regardless of the IGP metric. On the Cisco SPCOR 350-501 exam, this concept tests your understanding of how to enforce traffic engineering policies beyond simple shortest-path routing, such as forcing traffic away from congested or politically restricted links. A common trap is confusing affinity with link bandwidth or TE metric; remember that affinity controls *which* links are eligible, not *how much* traffic they carry. For the exam, think of affinity as a "color filter" for your network map—you paint links with colors (administrative groups) and tell the tunnel to only use blue links or to avoid red ones. A useful memory tip: "Affinity = Allowed or Forbidden, Filtering Interfaces by Named Tags Yours."
350-501 Networking Practice Question
This 350-501 practice question tests your understanding of networking. 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.
When implementing MPLS TE tunnels in a service provider core, what is the purpose of the 'affinity' attribute?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
To define administrative groups for link inclusion/exclusion
The 'affinity' attribute in MPLS TE is used to define administrative groups (also known as link colors) that allow you to include or exclude specific links from a TE tunnel path based on user-defined properties. This enables traffic engineering policies such as forcing traffic to avoid certain links or preferring links with specific characteristics, without modifying the underlying IGP metric.
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.
✗
To set the color of the tunnel
Why it's wrong here
Color is a different attribute for identifying tunnels.
✗
To adjust the cost of TE tunnels
Why it's wrong here
Cost adjustment is done via link metric or setup priority.
✓
To define administrative groups for link inclusion/exclusion
Why this is correct
Affinity allows tunnels to restrict links based on administrative group membership.
Related concept
Read the scenario before looking for a memorised answer.
✗
To bind tunnels to specific interfaces
Why it's wrong here
Binding is done via explicit path objects.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the confusion between 'affinity' (administrative groups for link inclusion/exclusion) and 'color' (a separate attribute used in Segment Routing or for visual identification), leading candidates to mistakenly choose Option A.
Detailed technical explanation
How to think about this question
Under the hood, the affinity attribute uses a 32-bit mask (configured via 'affinity' and 'mask' under the MPLS TE tunnel) that is compared against the administrative-group bits set on each link (via 'mpls traffic-eng administrative-group'). A tunnel will only use a link if the link's group bits match the tunnel's affinity mask according to the configured include-any, include-all, or exclude-all constraints. In real-world deployments, this allows operators to segregate traffic (e.g., low-latency links vs. high-bandwidth satellite links) without altering IGP metrics, enabling fine-grained path selection.
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.
TExam Day Tips
→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 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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Networking — This question tests Networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: To define administrative groups for link inclusion/exclusion — The 'affinity' attribute in MPLS TE is used to define administrative groups (also known as link colors) that allow you to include or exclude specific links from a TE tunnel path based on user-defined properties. This enables traffic engineering policies such as forcing traffic to avoid certain links or preferring links with specific characteristics, without modifying the underlying IGP metric.
What should I do if I get this 350-501 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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