Essential System Services and Networking →easyMultiple ChoiceObjective-mapped

LPIC-1 Essential System Services and Networking Practice Question

An administrator is configuring a DHCP server to assign IP addresses to clients in the 192.168.10.0/24 subnet. The server should provide the default gateway as 192.168.10.1 and DNS server as 8.8.8.8. Which option in /etc/dhcp/dhcpd.conf defines the default gateway?

⚠ Common exam trap

Watch out — candidates often confuse the `option routers` directive with `option domain-name-servers` or `option subnet-mask`, especially since all three are commonly used together in a subnet declaration, but only `option routers` sets the default gateway.

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

option routers 192.168.10.1;

The `option routers` directive in the ISC DHCP server configuration file `/etc/dhcp/dhcpd.conf` explicitly defines the default gateway (router) that clients should use. This directive sends the Router Option (option 3) in the DHCPOFFER and DHCPACK messages, instructing clients to set their default route to the specified IP address.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
option subnet-mask 255.255.255.0;
Why it's wrong here
This sets subnet mask.
✓
option routers 192.168.10.1;
Why this is correct
routers is the DHCP option for default gateway.
✗
option broadcast-address 192.168.10.255;
Why it's wrong here
This sets broadcast address.
✗
option domain-name-servers 8.8.8.8;
Why it's wrong here
This sets DNS servers.

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LPIC-1 Essential System Services and Networking Practice Question

Why each option matters

Option-by-option breakdown

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