ITPEC FE Morning October 2021 Question 33
In TCP/IP, which of the following is an application layer protocol that enables a server to automatically configure its clients with network information such as IP addresses, the subnet mask, and the default gateway address?
Explanation
DHCP — a server leases each client an IP address together with the subnet mask, default gateway and DNS server.
When a client starts up it broadcasts a request, since it has no address yet; a DHCP server offers an address from its pool with the other settings, and the client accepts. The address is leased for a set time and returns to the pool when released, so no one has to configure terminals by hand.
Answer (b)
Why not others:
- •(a) ARP — finds the MAC address that belongs to a known IP address on the local network; it configures nothing
- •(c) DNS — resolves domain names to IP addresses
- •(d) NSLOOKUP — a command for sending queries to DNS servers, a tool rather than a protocol
Key rule: DHCP configures a host, DNS turns names into IP addresses, and ARP turns IP addresses into MAC addresses.
Networks · AI-written, may contain errors
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