Exam N10-008 topic 1 question 238 discussion

A technician is troubleshooting reports that a networked printer is unavailable. The printer's IP address is configured with a DHCP reservation, but the address cannot be pinged from the print server in the same subnet. Which of the following is MOST likely the cause of the connectivity failure? A. Incorrect VLAN - If its on different VLAN, therefore, you are not able to pinged the printer B. DNS failure - The printer is not connecting to via URL C. DHCP scope exhaustion - The printer is configured with a DHCP reservation D. Incorrect gateway - question stated that the printer server is in the same subnet

If it’s reserved how can DHCP scope exhaustion affect it? I think it might be on the wrong VLAN

"...cannot be pinged from the print server in the SAME SUBNET" It cannot be VLAN else it would be in a different subnet. It cannot be DNS, obviously. It cannot be exhaustion, since it's reserved. The only thing left is gateway, which, even if the IP is reserved, the gateway could have been overridden.

I promise you it's not A. End of story.

It is clear here that only the VLAN segmentation that can prevent devices on the same subnet to communication one another if there is an IP reservation. The scenario would state it if DHCP had to assign the IP reserved to another device. Therefore, A is correct. Please, do not add what is not stated!

The gateway is responsible for routing traffic between different subnets or networks. In this scenario, if the printer's gateway is configured incorrectly or is unreachable, the print server in the same subnet won't be able to communicate with the printer, even if they have IP addresses in the same subnet.

There are two kinds of "reservations", those based on lease (temporary), and those based on administratively configured rules (permanent). For lease-based reservations, the server will stop responding to new DHCP requests when its pool of addresses is exhausted, but will free up space as soon as a lease expires. https://superuser.com/questions/1250270/can-mac-spoofing-make-dhcp-run-out-of-ip-addresses#:~:text=there%20are%20two%20kinds%20of,soon%20as%20a%20lease%20expires. You would have to be configuring the address in an entirely different department than the print server if the issue was the VLAN.

There are two kinds of "reservations", those based on lease (temporary), and those based on administratively configured rules (permanent). For lease-based reservations, the server will stop responding to new DHCP requests when its pool of addresses is exhausted, but will free up space as soon as a lease expires. https://superuser.com/questions/1250270/can-mac-spoofing-make-dhcp-run-out-of-ip-addresses#:~:text=there%20are%20two%20kinds%20of,soon%20as%20a%20lease%20expires.

Well, according to GPT, the DHCP server could assign the reserved IP for the printer to some other device if the printer was not online when the DHCP Scope was exhausted.

D. Incorrect gateway The most likely cause of the connectivity failure in this scenario is an incorrect gateway configuration. If the printer is configured with a DHCP reservation, it means it should have a specific IP address assigned to it. However, if the gateway (default gateway) is misconfigured or incorrect, the device will not be able to communicate outside its local subnet. In this case, the print server in the same subnet cannot ping the printer because it doesn't know how to reach it beyond the local subnet. VLAN configuration, DNS issues, and DHCP scope exhaustion might cause different problems, but in this specific case, an incorrect gateway is the most likely culprit for the connectivity failure.

D - Incorrect gateway "the address cannot be pinged from the print server in the same subnet". I would tend to go for incorrect gateway here. Other sites also saying D too.

Bing AI pick (D): "Based on the information provided, the most likely cause of the connectivity failure is (D) Incorrect gateway. A DHCP reservation ensures that a device is assigned a specific IP address every time it connects to the network. However, if the gateway address is incorrect, the device will not be able to communicate with other devices on the network, even if it has a valid IP address. In this case, since the printer’s IP address cannot be pinged from the print server in the same subnet, it is likely that the printer is not able to communicate with other devices on the network due to an incorrect gateway address. It is important to note that: (A) VLANs are used to segregate network traffic and are unlikely to cause connectivity issues in this scenario. (B) DNS failures can cause name resolution issues but are not likely to affect IP connectivity. (C) DHCP scope exhaustion occurs when there are no more available IP addresses in a DHCP pool, but this is not relevant since a DHCP reservation has been configured for the printer."

vlan means printer

If the printer's IP address is configured with a DHCP reservation, how is the DHCP scope exhausted?? This one has been bugging me. . . .Reservations don't expire. How is C the right answer???

This question is so weird answers could be a or d depends on additional troubleshooting and analyzing on the actual issue.

The most likely cause of the connectivity failure in this scenario is an incorrect gateway. If the printer's IP address is within the same subnet as the print server, and it has a DHCP reservation, then it should be reachable from the print server. If it cannot be pinged, it is likely that the traffic is not being routed correctly, and the gateway may be misconfigured. DNS failure, VLAN issues, and DHCP scope exhaustion would not prevent the printer from being reachable from the print server within the same subnet. I knew it this is a gateway issue

It cannot be DHCP exhaustion, it cannot be the default gateway. DHCP reserved and not default gateway because it is in same subnet and in the same subnet it will use MAC address to communicate (not the gateway). Not DNS most probably because I hope they are using the ip address to ping (but who knows). Incorrect VLAN means it is in a different broadcast domain. Another of those bad questions. But I will select incorrect VLAN