3.3.5 Practice Questions
Jodie is the administer for a single DHCP server for a network of three subnets. The DHCP server is configured with three scopes, one for each subnet. The three subnet addresses are 192.168.1.0, 192.168.2.0, and 192.168.3.0 using the default subnet mask. In addition to assigning IP addresses to network hosts, the DHCP server needs to configure the following: DNS server address for all hosts: 192.168.1.11 Default gateway for hosts on the 192.168.1.0 subnet: 192.168.1.1 Default gateway for hosts on the 192.168.2.0 subnet: 192.168.2.1 Default gateway for hosts on the 192.168.3.0 subnet: 192.168.3.1 How should you configure the DHCP scope options to minimize administrative effort?
Configure server options to deliver the DNS server address. Configure scope options for each scope to deliver each subnet's designated default gateway address. Explanation In this example, the method requiring the least effort is to configure the server options to deliver the DNS server address. Configure scope options for each scope to deliver the default gateway address designated for each subnet. Jodie could configure each scope to deliver both the DNS server and default gateway values. However, if the DNS server address changes, you would have to modify the DNS server parameter for each of the three scopes. Defining this value for the DHCP server creates a single location where the values can be modified. Jodie cannot configure the server options to deliver the default gateway because hosts within each scope require a different value. Use the server options to deliver the same values to all hosts on all scopes.
Anthony administers a single DHCP server for a network of three subnets. The DHCP server is configured with three scopes, one for each subnet. The three subnet addresses are 192.168.1.0, 192.168.2.0, and 192.168.3.0 and use the default subnet mask. The server delivers IP addressing and other TCP/IP configuration information. All hosts on all subnets should be configured to use 192.168.1.11 for the DNS server. In addition, the default gateway for hosts within a subnet should point to the first IP address on the subnet. The default gateway for hosts on subnet 192.168.1.0 should be set to 192.168.1.1. The default gateway for hosts on subnet 192.168.2.0 should be set to 192.168.2.1. The default gateway for hosts on subnet 192.168.3.0 should be set to 192.168.3.1. All clients run Windows 10. How should Anthony configure DHCP to minimize administrative effort?
Configure the server's scope options to deliver the DNS server value. Configure scope options for each scope to deliver the default gateway value. Explanation In this example, the method requiring the least effort is to configure the server options to deliver the DNS server address. Configure scope options for each scope to deliver the default gateway address. Anthony could configure each scope to deliver both the DNS server and default gateway values. However, if the DNS server address changes, Anthony would have to modify the DNS server parameter for each of the three scopes. Defining this value for the DHCP server creates a single location where the value can be modified. You cannot configure the server options to deliver the default gateway because hosts within each scope require a different value. Use the server options to deliver the same values to all hosts on all scopes.
Ralph is implementing a DHCP server for a segment. His segment's IP address is 192.168.1.0. His default gateway address is 192.168.1.254. His DNS server address is 192.168.1.1. His default gateway is configured as a NAT router to translate addresses between network segments. Ralph configures the 03 Router option on his DHCP server so it can deliver the IP address of the default gateway to workstations. After configuring his workstations to get their IP addressing information dynamically, his users complain that they are unable to access websites on the internet. How can Ralph resolve this problem?
He must configure his DHCP server with an option that delivers the IP address of the DNS server (option 06). Explanation In this scenario, the DHCP server hasn't been configured to deliver the IP address of the DNS server to the workstations. When users try to access websites with a browser, they receive an error message because their workstations can't resolve URLs into IP addresses. To fix this problem, Ralph must enable the 06 Domain Name Server option on the DHCP server and configure it with the IP address of your DNS server. Ralph could statically configure APIPA on each workstation with the IP address of the DNS server, but doing this would defeat the purpose of implementing a DHCP server in the first place.