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Nokia 4A0-100 Exam - Topic 3 Question 115 Discussion

Which of the following statements about the IP forwarding process on a router is TRUE?
B) It uses the routing table to find a match for the destination IP address.
A) It uses the routing table to find a match for the source IP address.
C) It uses the ARP table to find a match for the source MAC address.
D) It uses the ARP table to find a match for the destination MAC address.

Nokia 4A0-100 Exam - Topic 3 Question 115 Discussion

Actual exam question for Nokia's 4A0-100 exam
Question #: 115
Topic #: 3
[All 4A0-100 Questions]

Which of the following statements about the IP forwarding process on a router is TRUE?

Show Suggested Answer Hide Answer
Suggested Answer: B

When a router forwards a packet, it performs the following operations:

Looks up the destination IP address in the routing table to determine the next hop or egress interface.

Uses the ARP table to resolve the MAC address of the next-hop IP.

Option A is incorrect -- source IP is not used for route lookup.

Option C is incorrect -- routers don't resolve the source MAC.

Option D is partially true, but routing begins with the routing table, making B the most accurate.


Nokia IP Fundamentals Study Guide -- Chapter: ''IP Packet Forwarding''

RFC 1812 -- Requirements for IP Routers

by Princess at Jul 29, 2025, 07:13 AM

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Ty
9 months ago
C is totally wrong, ARP is for MAC addresses, not IPs.
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Lili
9 months ago
I thought it was A at first, but B makes more sense.
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Joanna
9 months ago
Yeah, D is also not right; ARP is not used for routing decisions.
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Magnolia
9 months ago
Wait, are we sure about B? Seems too simple.
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Kris
9 months ago
Definitely B! It's all about the destination IP.
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Mozelle
10 months ago
I feel like I’ve seen questions where the focus was on the destination IP, but I’m not 100% confident about the specifics here.
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Dexter
10 months ago
I’m a bit confused about the ARP table part. I thought ARP was mainly for resolving MAC addresses, not for IP forwarding.
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Kaitlyn
10 months ago
I remember practicing a similar question, and I believe it was about matching destination IPs in the routing table. That feels right.
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Kris
10 months ago
I think the router uses the routing table for the destination IP address, but I'm not completely sure if that's the only thing it does.
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Pilar
11 months ago
This is a tricky one, but I think the best approach is to visualize the IP forwarding process step-by-step. The router definitely uses the routing table, and it's for the destination IP, not the source. I'm confident B is the correct answer.
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Simona
11 months ago
The key here is understanding the IP forwarding process on a router. I believe the routing table is used to find a match for the destination IP address, so I'm going with option B.
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Skye
11 months ago
Hmm, I'm a bit confused on this one. I know routers use the routing table, but I can't remember if it's for the source or destination IP. I'll have to think this through carefully.
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Sarina
11 months ago
I'm pretty sure the answer is B. Routers use the routing table to find a match for the destination IP address, not the source IP address.
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