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Ericsson ECP-206 Exam - Topic 6 Question 48 Discussion

Actual exam question for Ericsson's ECP-206 exam
Question #: 48
Topic #: 6
[All ECP-206 Questions]

What is an important difference between OSPF and IS-IS?

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Suggested Answer: A

OSPF runs directly on IP, while IS-IS runs directly on Ethernet. This means that OSPF uses IP addresses to identify routers and links, while IS-IS uses MAC addresses or other link-layer identifiers. OSPF also requires an IP header for each packet, while IS-IS does not. Both OSPF and IS-IS are link state protocols, which means that they flood information about the network topology to all routers in the same area or domain.Reference:Ericsson IP Networking - Routing Protocols,Ericsson Router 6000 Series - Ericsson


by Long at Nov 25, 2025, 07:57 PM

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Catrice
13 hours ago
Surprised to see so many mix-ups on this topic!
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Aleisha
6 days ago
I thought IS-IS was a distance vector protocol?
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Lezlie
11 days ago
OSPF runs on IP, IS-IS on Ethernet. True fact!
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Danica
16 days ago
Wait, isn't IS-IS also a link state protocol?
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Lavonna
21 days ago
OSPF is definitely a link state protocol!
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Edmond
26 days ago
Wait, so IS-IS doesn't run on IP? That's wild. I wonder if it runs on carrier pigeons instead.
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Geoffrey
1 month ago
Hmm, I thought OSPF was the one that ran on Ethernet. Guess I need to brush up on my routing protocols.
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Chantay
1 month ago
I feel like I read that OSPF runs directly on IP, but I’m not completely confident about the details of IS-IS.
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Casandra
1 month ago
I practiced a question like this, and I think OSPF is definitely a link state protocol, but I’m confused about how IS-IS fits in.
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Tesha
2 months ago
I remember something about OSPF being more common in IP networks, but I can't recall if IS-IS runs on Ethernet or something else.
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Sanda
2 months ago
Ah, I remember now - OSPF is a link state protocol, and IS-IS is also a link state protocol. The difference is in the layer they operate at, not the protocol type.
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Precious
2 months ago
I'm pretty confident that OSPF is a link state protocol, while IS-IS is a distance vector protocol. That's the important difference between the two.
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Cortney
2 months ago
I think OSPF and IS-IS both use link state, but I’m not sure about the specifics of how they operate on different layers.
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Paris
2 months ago
Wait, I thought it was the other way around - that OSPF runs on Ethernet and IS-IS runs on IP. This is tricky, I need to review my notes.
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Mitsue
2 months ago
The correct answer is D. OSPF is a link state protocol, while IS-IS is also a link state protocol. This is an important difference between the two.
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Jess
3 months ago
D all the way! I can never keep those two straight, but at least I know the difference now.
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Joesph
3 months ago
Okay, I've got this. OSPF runs directly on IP, while IS-IS runs directly on Ethernet. That's the key difference between them.
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Emilio
3 months ago
Hmm, I think I remember something about OSPF being a link state protocol, but I'm not sure about IS-IS. I'll have to think this through carefully.
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Oretha
3 months ago
I believe OSPF is definitely a link state protocol.
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