Exam 350-401 topic 1 question 637 discussion

A maximum transmission unit (MTU) is the largest length of a packet that can be transmitted out of an interface toward a destination. maximum receive unit (MRU) is the largest packet size that an interface can receive, so it's an ingress interface parameter. https://www.networkers-online.com/p/understand-mtu-and-mru-the-full-story

The question specifically asks "which component of TCP". If you go and look up TCP you will see that there are no parts of a TCP PDU for MTU/MRU, as these are set in layer 2 in the ethernet frame. Window Size is the way TCP controls flow, so the answer has to be C. The lesson here is - don't ask a question about TCP (layer 4) and then expect an answer about another layer. Stupid question.

Relationship with MTU MRU is closely related to Maximum Transmission Unit (MTU), but they serve different purposes: MTU is the largest packet size that can be transmitted out of an interface MRU is the largest packet size that can be received by an interface

There is no such TCP component - MRU. Therefore, correct anwer is C.

D is correct If a device is receiving packets that are bigger in length than interface MRU due to some reason, the packets will be considered "Too big" or oversized. Usually there will be a counter incrementing on the interface and those packets will likely be dropped by the router's forwarding plane. So most likely it´s MRU. I think C is incorrect because Window Size determines how much data a host can recieve BEFORE IT SENDS ACK (which is not mentioned in the que). https://networkers-online.com/p/understand-mtu-and-mru-the-full-story#:~:text=On%20the%20other%20hand%20maximum,by%20the%20router%27s%20forwarding%20plane.

i think C is correct

According to the following topic, D is correct in my opinion: https://networkers-online.com/p/understand-mtu-and-mru-the-full-story

MRU is general, it is no a puntual concept fot TCP. The option C is the answer for me. MSS is the concept for TCP

It is MRU, which defines the largest packet size that a host interface is able to accept on ingress. It acts as a receiving buffer limit, preventing oversized packets from being received and potentially causing errors. Window size influences data flow control but doesn't dictate the maximum packet size.

Window size is not correct , mainly application which detrimin the window size for TCP transmission

A maximum transmission unit (MTU) is the largest length of a packet that can be transmitted out of an interface toward a destination. Maximum Receive Unit (MRU) is the largest packet size that an interface can receive, so it's an ingress interface parameter. https://www.networkers-online.com/p/understand-mtu-and-mru-the-full-story

C is correct.

C - For sure, the question says "component of TCP". The devices will negotiate a window size that both can handle. Congestion occurs when the interface has to transmit more data than it can handle. It’s queue(s) will hit a limit and packets will be dropped. https://networklessons.com/cisco/ccie-routing-switching-written/tcp-window-size-scaling

MRU? On the other hand maximum receive unit (MRU) is the largest packet size that an interface can receive, so it's an ingress interface parameter. In most of the cases MRU equals MTU but it's not a requirement. You can configure different values for both MTU and MRU to achieve some benefits.

This is actually a wrongly worded question which is totally mixing networking units. TCP is L4, packet is for L3 and interface capability is more of an L2 term. https://i.stack.imgur.com/6dKkj.gif

"...component of TCP..." - Has to be TCP window size. That's about the only thing TCP has that can influence how much data the ingress interface on the far-side can accept before sending back and ack.

TCP L4, MTU L2 naswer C