Exam 300-410 topic 1 question 198 discussion

The given answer is correct. The default gateway's address is automatically reserved when the DHCP pool is created. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_dhcp/configuration/12-4/dhcp-12-4-book/config-dhcp-server.html

E is wrong. Default gateway is automatically excluded from the DHCP address pool. No need to configure. Excluding IP Addresses Perform this task to specify IP addresses (excluded addresses) that the DHCP server should not assign to clients. The IP address configured on the router interface is automatically excluded from the DHCP address pool. The DHCP server assumes that all other IP addresses in a DHCP address pool subnet are available for assigning to DHCP clients. https://www.cisco.com/en/US/docs/ios/12_4t/ip_addr/configuration/guide/htdhcpsv.html#wp1046221

Correct

B and C is correct

B= fix every second month issue E= fix inconsistent connectivity issue.

I choose BE. Because DHCP determine which pool to assign either by the incoming interface of DHCP request for directly connected case or if it is a DHCP relay, the discover will carry the incoming address of the relay server receiving this DHCP discover request or an option 82 field, then the DHCP server shall use either field to determine which pool to assign. The default gateway in this config may not be the interface of the DHCP server (connected case) or the giaddr of the relay server which will be automatically excluded.

sine we don't know if the default-gateway is in this router we have to exclude the default-gateway address from the pool so the correct answer is B&E

BC, When configuring dhcp pool the address of the default router is reserved automatically. The exhibit does not present enough information to infer that the address configured in the pool is that of a standalone DHCP server.

Sorry team, in my previous answer, I tried this in my laboratory, and the correct answer is B and C, because only the server ip has to be excluded. The "E" is not correct, because automatically when we configure the default-router that available address is automatically excluded. The "E" is not correct. I tested this in my lab. Correct option is B and C

guys thincking, is B and E: Because its necesary exclude ip server, printer, VM, etc. and default gateway (interface router).

From the question, it is not mentioned if this device is a router or a layer 3 switch, also there is no info as per if the gateway is on an interface of this device, hence the gateway can be on any device, and this device is only used as dhcp server. So I will suggest C and E

Answer is BC. E is not applicable, as the DHCP pool could still be utilized by other devices and removing the default gateway will cause connectivity issues on those devices.

The question didn't say the DHCP router is the gateway as well. Excluding the gateway IP is a good idea especially the DHCP server is not in the same segment as the client

E is wrong, you cannot reserve a default gateway. So BC correct.

You can only exclude the statically assigned address, you cannot "exclude a default gateway" from a DHCP server.

Set the "ip dhcp excluded-address" including the default gateway and DNS.

At first glance the answer looks like B and C. However I think its B and E. From the output the default router address 200.30.40.100 is not excluded from the dhcp pool 2. So a host device could pick up that ip address via dhcp. And the question states the server is not reachable "consistently" ie not at all. So that has probably happened and all devices with ip address from dhcp pool 2 are isolated within the 200.30.40.0/24 network and not reachable. Note the same issue exists with dhcp pool 1. It has not excluded 200.30.30.100 from the dhcp pool. You could argue that Cisco DHCP would ping the default-router the address first - get a reply - and mark it as in use and not hand it out. So that would suggest B and C work as the correct answer. But that would be very bad prectice - and what if the router address blocks icmp. The Cisco DHCP service would think the address is not in use.