Exam 200-301 topic 1 question 1197 discussion

If there is a cable disconnect, the status will show as down/down. In this case, apart from Half Duplex, there are also 0 CRC and 50 collisions. The simultaneous presence of CRC errors and collisions may indicate a problem with the cable, but 0 CRC with some collisions suggests a duplex configuration issue.

When cable is disconnected, interface is in down/down state. In his case it is up/down. Therefore D is correct answer. Rest are invalid.

pay attention to those interface resets! just unplugging it wont cause that! repeated collisions can cause interface resets, duplex mismatch will cause repeated collisions, the interface will come back up after resetting, but this snapshot must have been taken during the reset.

Line protocol down can be an indication of duplex mismatch, if the cable was not connected then it would say g0/0 down line protocol down but in the questions output the g0/0 is up so cable is connected

If cable is disconnected, the interface will be down/down.

https://community.cisco.com/t5/switching/fastethernet0-0-is-up-line-protocol-is-down/td-p/806885

D is correct (Duplex mismatch)

GigabitEthernet0/0/1 is up- this means the physical interface is okay

A. Port security: There’s no indication that port security is causing the issue. B. Cable disconnect: The interface is up, so the cable is likely connected. If the cable were disconnected, the interface would likely be down. C. High throughput: There’s no indication of high throughput issues; the output rate is low. D. Duplex mismatch: The interface is set to half-duplex, which is unusual for a Gigabit Ethernet connection (which typically runs in full-duplex). The presence of collisions also suggests a duplex mismatch, as collisions are common in half-duplex environments when one side is configured incorrectly. Based on the provided information and the common symptoms of duplex mismatches (e.g., collisions, line protocol down), the most likely issue with the interface GigabitEthernet0/0/1 is: D. Duplex mismatch

I think it is D, cable disconnect is not the exact word I would use. cable issue maybe.

input error: duplex mismatch, bad cables or NIC problems. option B sounds like completely disconnected, it will cause line down/proto down

When cable is disconnected, interface is in down/down state. In his case it is up/down. Therefore D is correct answer. Rest are invalid.

it´s B line protocol is down

Half Duplex, 1000Mbps" is unusual because GigabitEthernet typically operates in full duplex. This discrepancy could indicate a duplex mismatch, which can happen when one side of a connection is set to full duplex and the other side to half duplex, or when one side is set to auto-negotiate and the other is manually set to a fixed speed or duplex setting. "50 collisions" is another indicator that points to a duplex mismatch. Collisions should not occur on full-duplex links. On a Gigabit interface, it's even more uncommon because GigabitEthernet should only operate in full duplex.

B Line protocol down == no cable, bad cable, speed mismatch, etc. Line protocol down(err disabled) == Port security has disabled the interface this is a good video that made me understand most of this: https://www.youtube.com/watch?v=tZbayqSJISU

B because line protocol is down

B; the line protocol is down. As for the other answers: A -> Incorrect; if it were a port security violation, the line protocol would read "down (err-disabled)". C -> Incorrect; the line is down, there's no throughput. D -> Partially correct; interface is configured as half-duplex and there's a number of collisions. However, since the interface is down, it's not the relevant issue.