Discuss Ericsson ECP-206 Exam Topic 6 Question 48

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

AOSPF runs directly on IP, while IS-IS runs directly on Ethernet.

BOSPF is a link state protocol, while IS-IS is a distance vector protocol.

COSPF runs directly on Ethernet, while IS-IS runs directly on IP.

DOSPF is a distance vector protocol, while IS-IS is a link state protocol.

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

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29 comments · newest first

Willodean 6 months ago

A seems plausible, but B is more accurate overall.

Dyan 6 months ago

I lean towards B too. Link state is key for OSPF.

Cathern 6 months ago

D is totally wrong. IS-IS is not distance vector.

Christiane 7 months ago

I feel confused about C. It doesn't sound right.

Ilona 7 months ago

No way, it's B! OSPF is definitely link state.

Fletcher 7 months ago

I think A is correct. OSPF on IP makes sense.

Catrice 8 months ago

Surprised to see so many mix-ups on this topic!

Aleisha 8 months ago

I thought IS-IS was a distance vector protocol?

Lezlie 8 months ago

OSPF runs on IP, IS-IS on Ethernet. True fact!

Danica 8 months ago

Wait, isn't IS-IS also a link state protocol?

Lavonna 8 months ago

OSPF is definitely a link state protocol!

Edmond 8 months ago

Wait, so IS-IS doesn't run on IP? That's wild. I wonder if it runs on carrier pigeons instead.

Geoffrey 9 months ago

Hmm, I thought OSPF was the one that ran on Ethernet. Guess I need to brush up on my routing protocols.

Chantay 9 months ago

I feel like I read that OSPF runs directly on IP, but I’m not completely confident about the details of IS-IS.

Casandra 9 months 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.

Tesha 9 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.

Sanda 9 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.

Precious 9 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.

Cortney 10 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.

Paris 10 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.

Mitsue 10 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.

Jess 10 months ago

D all the way! I can never keep those two straight, but at least I know the difference now.

Joesph 11 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.

Emilio 11 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.

Katheryn 5 months ago

↳ replying to Emilio

So, is OSPF the only link state one?

Kattie 6 months ago

↳ replying to Emilio

I thought IS-IS was more about Ethernet.

In 6 months ago

↳ replying to Emilio

OSPF runs on IP, right?

Argelia 6 months ago

↳ replying to Emilio

Yeah, I think IS-IS is also a link state protocol.

Oretha 10 months ago

↳ replying to Emilio

I believe OSPF is definitely a link state protocol.

Ericsson ECP-206 Exam - Topic 6 Question 48 Discussion