Question 379 of 2,015

Network Function Virtualization →hardMatchingObjective-mapped

Quick Answer

The answer is the egress router, which is the last element before the destination network in a typical service chaining order. This placement is correct because service chaining directs traffic through a sequence of network functions—starting at the ingress router, then through a firewall for security, a load balancer for distribution, and a WAN optimizer for performance—before the egress router forwards the cleaned, balanced, and optimized traffic to its final destination. On the ENCOR 350-401 exam, this drag-and-drop task tests your understanding of the logical flow within a service chain, often appearing alongside questions about policy-based routing or SD-Access fabric. A common trap is confusing the ingress and egress routers, but remember that traffic enters through ingress and exits through egress. For a quick memory tip, think of the chain as "In-Fire-Load-WAN-Out": the egress router is always the last "Out" step before the destination network.

350-401 Network Function Virtualization Practice Question

This 350-401 practice question tests your understanding of network function virtualization. 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.

Drag and drop each service chaining element on the left to its matching position in a typical chain on the right.

Question 1hardmatching

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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

✓

Ingress Router: First element in the service chain

In a typical service chain, traffic flows from the ingress router through firewall, load balancer, WAN optimizer, and finally to the egress router.

Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Common exam traps

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.

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.

What to study next

Got this wrong? Here's your next step.

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 350-401 NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this 350-401 question test?

Network Function Virtualization — This question tests Network Function Virtualization — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: Ingress Router: First element in the service chain — In a typical service chain, traffic flows from the ingress router through firewall, load balancer, WAN optimizer, and finally to the egress router.

What should I do if I get this 350-401 question wrong?

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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