DNS translates names to addresses in Intro to Computing - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the sentence to explain what DNS does.

Intro to Computing

DNS translates a website's [1] into its IP address.

Drag options to blanks, or click blank then click option'

AIP address

Bdomain name

CMAC address

Dport number

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing IP address with domain name

Thinking DNS translates IP to domain name

DNS converts the human-friendly domain name (like example.com) into a computer-friendly IP address.

2fill in blank

medium

Complete the sentence to describe what an IP address is.

Intro to Computing

An IP address is a unique [1] that identifies a device on the internet.

Drag options to blanks, or click blank then click option'

Anumber

Bname

Cpassword

Dlocation

Attempts:

3 left

💡 Hint

Common Mistakes

Thinking IP address is a name

Confusing IP address with password

An IP address is a unique number assigned to each device connected to the internet.

3fill in blank

hard

Fix the error in the sentence about DNS.

Intro to Computing

DNS translates IP addresses into [1] so users can remember websites easily.

Drag options to blanks, or click blank then click option'

Aport numbers

BMAC addresses

Cdomain names

Demail addresses

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up domain names and IP addresses

Confusing DNS with other network services

DNS actually translates domain names into IP addresses, but it also helps reverse lookup so users can remember names instead of numbers.

4fill in blank

hard

Fill both blanks to complete the DNS lookup process.

Intro to Computing

When you type a [1] in your browser, DNS finds the [2] to connect you to the website.

Drag options to blanks, or click blank then click option'

Adomain name

BIP address

Cemail address

DMAC address

Attempts:

3 left

💡 Hint

Common Mistakes

Using IP address in the first blank

Confusing email or MAC address with website addresses

Typing a domain name triggers DNS to find the IP address so your browser can connect to the website.

5fill in blank

hard

Fill all three blanks to describe DNS translation.

Intro to Computing

DNS servers [1] domain names to [2] addresses by checking [3] records.

Drag options to blanks, or click blank then click option'

Atranslate

BIP

CDNS

Dstore

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'store' instead of 'translate' for the first blank

Confusing DNS with IP in the third blank

DNS servers translate domain names to IP addresses by checking DNS records.

Practice

1. What is the main purpose of DNS (Domain Name System)?

easy

A. To speed up internet connection

B. To store website images

C. To translate website names into IP addresses

D. To block unwanted websites

Solution

1. Step 1: Understand what DNS does

   DNS converts easy-to-remember website names into numbers called IP addresses that computers use.

2. Step 2: Identify the correct purpose

   Among the options, only translating names to IP addresses matches DNS's main role.

3. Final Answer:

   To translate website names into IP addresses -> Option C

4. Quick Check:

   DNS = Name to IP translation [OK]

Hint: DNS changes names to numbers for computers [OK]

Common Mistakes:

• Thinking DNS stores website content
• Confusing DNS with internet speed tools
• Believing DNS blocks websites

2. Which of the following is the correct format of an IP address that DNS translates to?

easy

A. 192.168.1.1

B. example@domain

C. www.example.com

D. http://example

Solution

1. Step 1: Identify IP address format

   IP addresses are numeric and separated by dots, like 192.168.1.1.

2. Step 2: Match options to IP format

   Only 192.168.1.1 matches the numeric dotted format of an IP address.

3. Final Answer:

   192.168.1.1 -> Option A

4. Quick Check:

   IP address = numeric with dots [OK]

Hint: IP addresses are numbers separated by dots [OK]

Common Mistakes:

• Choosing website names instead of IPs
• Confusing URLs with IP addresses
• Selecting email-like formats

3. Consider this flowchart of DNS resolution:



If the DNS server does not have the IP address cached, what is the next step?

medium

A. Restart the computer

B. Return an error to the user

C. Directly connect to the website

D. Query the root DNS servers

Solution

1. Step 1: Understand DNS cache miss

   If the DNS server lacks the IP address, it must ask higher-level servers for help.

2. Step 2: Identify the next query target

   The next step is to query root DNS servers to find the authoritative server for the domain.

3. Final Answer:

   Query the root DNS servers -> Option D

4. Quick Check:

   Cache miss -> ask root servers [OK]

Hint: No cache? Ask root DNS servers next [OK]

Common Mistakes:

• Thinking DNS returns error immediately
• Trying to connect without IP
• Restarting computer unnecessarily

4. A user tries to visit www.example.com but gets an error saying 'DNS server not found'. What is the most likely cause?

medium

A. The DNS server address is incorrect or unreachable

B. The website is down

C. The user's computer has no internet cable plugged in

D. The website name is misspelled

Solution

1. Step 1: Analyze the error message

   'DNS server not found' means the computer cannot reach the DNS server to translate the name.

2. Step 2: Identify the cause

   This usually happens if the DNS server address is wrong or the server is unreachable, not because the website is down or misspelled.

3. Final Answer:

   The DNS server address is incorrect or unreachable -> Option A

4. Quick Check:

   DNS server unreachable -> error [OK]

Hint: DNS errors mean server address issues [OK]

Common Mistakes:

• Assuming website is down
• Blaming internet cable without checking DNS
• Ignoring DNS server settings

5. You want to speed up your website loading by reducing DNS lookup time. Which method below applies DNS caching correctly?

hard

A. Change website names to random numbers

B. Store IP addresses of frequently visited websites locally for quick access

C. Use longer website names to avoid confusion

D. Disable DNS on your computer

Solution

1. Step 1: Understand DNS caching

   DNS caching saves IP addresses locally so the computer doesn't ask the DNS server every time.

2. Step 2: Identify the correct caching method

   Storing IPs of frequent sites locally speeds up loading by skipping repeated lookups.

3. Step 3: Eliminate wrong options

   Changing names to numbers or disabling DNS breaks the system; longer names don't help speed.

4. Final Answer:

   Store IP addresses of frequently visited websites locally for quick access -> Option B

5. Quick Check:

   DNS caching = local IP storage [OK]

Hint: Cache IPs locally to speed DNS lookups [OK]

Common Mistakes:

• Thinking changing names helps speed
• Disabling DNS to fix speed
• Using longer names to improve performance