This question sucks. Realistically you can configure inter vlan routing on either distribution or the core layer provided that you have layer 3 switches. I have been told the core layer should only handle traffic intended to go outside your network thus according to that logic it should be configured on distribution layer. Also see this post.
https://community.cisco.com/t5/switching/ccnp-studies-svi-intervlan-routing-disagree-w-answer/td-p/2300859
However, the question informs separate switches that "could" be separated by the core, because if we look at the tree-tier architecture we notice that connecting in other parts of the company would be in other switches separated by the core, such as other sectors (commercial to engineering), in this case it would be forced to go through the core to access switches separated from other parts, which I believe is the answer. See an example of the design that the distribution switch does not reach all the access switches, in these cases it would need the core:
https://www.leviton.com/en/solutions/industries/data-centers/architectures/threetier-network-architecture
Distribution switches can connect to each other, depending on physical location and design, not to mention the case in which access switches connected to the same distribution switch. The traffic does not have to go a level up to the core switch. This is why the 3-tier network does not guarantee equal hop number or latency. In comparison, a spin-leaf topology eliminates horizontal connections between switches at the same level.
Yeah but still, think about it as in the CCNA exam logic, we study cisco materials, where, talking about 3-tier topology, distribution more often doesn't connect directly to each other.
For two access switches connected on the same distribution, traffic: access-distribution-acces (which is not listed here). Also as the question precise "separate switch" we should consider that such topology, in a lan campus, are not in the same building.
Therefore, traffic goes like : access-distribution-core-distribution-access
Access Layer: The packet is sent from the originating workstation to its directly connected access switch.
Distribution Layer: The access switch forwards the packet up to a distribution switch.
Core Layer: The distribution switch forwards the packet to the core switch.
Distribution Layer: The core switch sends the packet down to the appropriate distribution switch that connects to the destination access switch.
Access Layer: The distribution switch forwards the packet to the destination access switch, which then sends it to the target workstation.
This sequence (access → distribution → core → distribution → access) is correct.
Gentlemen, stop searching for the square of the circle. It clearly says THREE-TIER ARCHITECTURE, the discussion is over. You just have to look at option D, it's done.
Sorry team - simply not enough information to make a valid decision.
Options 'a' and 'c' are out - that's obvious.
Both options 'b' and 'd' are valid.
It depends upon the topology and the source/destination pair.
Just because one has a three-tier architectural model doesn't mean you have to use it.
It is possible that it only goes up to the aggregation / policy making layer (distribution).
It is possible that it has to travel across the core.
All I know for sure is that it isn't possible to know given the limited information!
I've thought some more about this.
The correct answer is option 'd'.
The question specifically makes mention of the three-tier model.
As such, data travels from access to distribution to core, back to distribution and access.
Sorry for the long winded answer!
Correct answer is D.
Workstation A --> Access Switch A --> Distribution Switch A --> Core Switch --> Distribution Switch B --> Access Switch B --> Workstation B
This is one of the harder concepts to master. But I chose D and I was correct. I knew the answer, but it seems so obvious that it should have been a straight 5-0 unanimous vote. But whatever. gg good day Go Dodgers
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