FirstHack Learn
Log in Sign up free
Lessons in this course 0/6 All courses Computer Networks

CSE

Progress0 / 6 lessons
  1. 1. What happens when you type a URL and press enter
  2. 2. The layered model, without reciting it like a poem
  3. 3. IP addressing and subnetting, with worked examples
  4. 4. TCP vs UDP, and why each one exists
  5. 5. DNS, DHCP and ARP: the three protocols that make it work
  6. 6. HTTP, HTTPS, and what TLS actually protects

Courses › Computer Networks

DNS, DHCP and ARP: the three protocols that make it work

How you get a name resolved, an address assigned, and a MAC discovered.

12 min read · Lesson 5 of 6 · Pro

Three different lookups, often confused

Students blur these together. Separate them with one sentence each.

  • DNS — I have a name, I need an IP address.
  • DHCP — I have nothing, I need my own IP address.
  • ARP — I have an IP address on my own network, I need its MAC address.

Different questions, different scopes. ARP never leaves your local network. DNS crosses the world. DHCP happens once, when you join.

DNS: names to addresses

The rest of this lesson is Pro

The free lessons of Computer Networks finish what they start — read those first if you have not. This one goes further, and it is part of the paid half.

A pass opens the paid lessons of every course, the mock test papers and the company-wise series. It ends on its own date; nothing renews by itself.

Get a pass — from ₹29 for 7 days

Already bought one? Log in.