Network+ PBQ 3: DHCP & DNS Services

Scenario

A branch office reports that some clients cannot get valid addresses, some users cannot reach intranet.company.local by name, and a printer must always keep the same IP address. The DHCP server scope is 10.20.30.100-10.20.30.199/24. Router/gateway is 10.20.30.1. DNS server is 10.20.30.10.

Your task: Configure DHCP and DNS services correctly.

1. Default gateway option should be:

2. DNS server option should be:

3. Printer needs same IP every time. Best DHCP feature:

4. Address 10.20.30.150 is already used by a static server. Best DHCP scope action:

Name Resolution

5. DNS record type for intranet.company.local pointing to IPv4 address:

6. DNS record type for mail routing:

7. DNS record type for reverse lookup:

8. Client has 169.254.25.10. Most likely problem:

Instructor Answer

Default gateway: 10.20.30.1.
DNS server: 10.20.30.10.
Use a DHCP reservation when a device should always get the same IP from DHCP.
Use a DHCP exclusion to prevent DHCP from assigning an address used statically elsewhere.
An A record maps a hostname to an IPv4 address.
An MX record identifies mail exchangers.
A PTR record supports reverse lookup.
A 169.254.x.x address indicates APIPA, usually because DHCP failed.