Question 76 of 505

Network Fundamentals →hardMultiple ChoiceObjective-mapped

200-901 Network Fundamentals Practice Question

This 200-901 practice question tests your understanding of network fundamentals. 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.

Exhibit

Refer to the exhibit.
```
Router# show ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is 10.0.0.1 to network 0.0.0.0

     10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C       10.0.0.0/30 is directly connected, GigabitEthernet0/0
L       10.0.0.2/32 is directly connected, GigabitEthernet0/0
     192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
C       192.168.1.0/24 is directly connected, GigabitEthernet0/1
L       192.168.1.1/32 is directly connected, GigabitEthernet0/1
S*   0.0.0.0/0 [1/0] via 10.0.0.1
```

Refer to the exhibit. A router has the routing table shown. A packet arrives at GigabitEthernet0/0 with destination IP 8.8.8.8. What will the router do?

Question 1hardmultiple choice

Read the full NAT/PAT explanation →

Exhibit

Refer to the exhibit.
```
Router# show ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is 10.0.0.1 to network 0.0.0.0

     10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C       10.0.0.0/30 is directly connected, GigabitEthernet0/0
L       10.0.0.2/32 is directly connected, GigabitEthernet0/0
     192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
C       192.168.1.0/24 is directly connected, GigabitEthernet0/1
L       192.168.1.1/32 is directly connected, GigabitEthernet0/1
S*   0.0.0.0/0 [1/0] via 10.0.0.1
```

A
Look up the destination in the ARP cache and then forward.
Why wrong: It first does routing lookup; ARP is for local delivery.
B
Send an ICMP unreachable message back to the source.
Why wrong: Since a default route exists, it will forward, not send unreachable.
C
Forward the packet out GigabitEthernet0/1 to the default gateway.
Why wrong: The default route points out GigabitEthernet0/0 via 10.0.0.1.
D
Drop the packet because there is no route to 8.8.8.8.
Why wrong: The default route exists, so it will not be dropped.
E
Forward the packet out GigabitEthernet0/0 via 10.0.0.1.
The default route is used, and the next hop is 10.0.0.1 out Gi0/0.

Full breakdown with real-world context →

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

✓

Forward the packet out GigabitEthernet0/0 via 10.0.0.1.

The router has a default route via 10.0.0.1. The destination 8.8.8.8 does not match any specific route, so it will use the default route. The packet will be forwarded out GigabitEthernet0/0 to 10.0.0.1.

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.

✗
Look up the destination in the ARP cache and then forward.
Why it's wrong here
It first does routing lookup; ARP is for local delivery.
✗
Send an ICMP unreachable message back to the source.
Why it's wrong here
Since a default route exists, it will forward, not send unreachable.
✗
Forward the packet out GigabitEthernet0/1 to the default gateway.
Why it's wrong here
The default route points out GigabitEthernet0/0 via 10.0.0.1.
✗
Drop the packet because there is no route to 8.8.8.8.
Why it's wrong here
The default route exists, so it will not be dropped.
✓
Forward the packet out GigabitEthernet0/0 via 10.0.0.1.
Why this is correct
The default route is used, and the next hop is 10.0.0.1 out Gi0/0.
Related concept
Static NAT maps one inside address to one outside address.

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 200-901 NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this 200-901 question test?

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

What is the correct answer to this question?

The correct answer is: Forward the packet out GigabitEthernet0/0 via 10.0.0.1. — The router has a default route via 10.0.0.1. The destination 8.8.8.8 does not match any specific route, so it will use the default route. The packet will be forwarded out GigabitEthernet0/0 to 10.0.0.1.

What should I do if I get this 200-901 question wrong?

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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Last reviewed: Jun 24, 2026

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