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Which of the following statements about the IP forwarding process on a router is TRUE?
Suggested Answer: B
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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
13 comments · newest first
TY
Ty
10 months ago
C is totally wrong, ARP is for MAC addresses, not IPs.
LI
Lili
10 months ago
I thought it was A at first, but B makes more sense.
JO
Joanna
11 months ago
Yeah, D is also not right; ARP is not used for routing decisions.
MA
Magnolia
11 months ago
Wait, are we sure about B? Seems too simple.
KR
Kris
11 months ago
Definitely B! It's all about the destination IP.
MO
Mozelle
11 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.
DE
Dexter
11 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.
KA
Kaitlyn
12 months ago
I remember practicing a similar question, and I believe it was about matching destination IPs in the routing table. That feels right.
KR
Kris
12 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.
PI
Pilar
1 year 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.
SI
Simona
1 year 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.
SK
Skye
1 year 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.
SA
Sarina
1 year 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.