SMTP, POP3, IMAP for email in Computer Networks - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to identify the protocol used to send emails.

Computer Networks

The protocol used to send emails is called [1].

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

AIMAP

BSMTP

CPOP3

DFTP

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing SMTP with POP3 or IMAP which are used for receiving emails.

Choosing FTP which is unrelated to email.

SMTP stands for Simple Mail Transfer Protocol and is used to send emails from a client to a server or between servers.

2fill in blank

medium

Complete the code to identify the protocol that downloads emails and deletes them from the server.

Computer Networks

The protocol that downloads emails and usually deletes them from the server is [1].

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

APOP3

BHTTP

CIMAP

DSMTP

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing POP3 with IMAP which keeps emails on the server.

Choosing SMTP which is for sending emails.

POP3 (Post Office Protocol version 3) downloads emails to the client and typically removes them from the server.

3fill in blank

hard

Fix the error in the sentence describing the protocol that keeps emails on the server and allows multiple devices to access them.

Computer Networks

The protocol that keeps emails on the server and allows access from multiple devices is [1].

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

APOP3

BSMTP

CIMAP

DFTP

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing POP3 which downloads and removes emails from the server.

Confusing SMTP which is for sending emails.

IMAP (Internet Message Access Protocol) keeps emails on the server and allows multiple devices to access and manage the same mailbox.

4fill in blank

hard

Fill both blanks to complete the sentence about email protocols.

Computer Networks

To send an email, the client uses [1], and to receive emails while keeping them on the server, it uses [2].

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

ASMTP

BPOP3

CIMAP

DHTTP

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up POP3 and IMAP for receiving emails.

Using HTTP which is unrelated to email.

SMTP is used to send emails, while IMAP is used to receive emails and keep them on the server for access from multiple devices.

5fill in blank

hard

Fill all three blanks to complete the dictionary comprehension about email protocols.

Computer Networks

protocols = {"send": "[1]", "receive_pop": "[2]", "receive_imap": "[3]"}

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

ASMTP

BPOP3

CIMAP

DFTP

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing FTP with email protocols.

Swapping POP3 and IMAP roles.

SMTP is used for sending emails, POP3 for receiving and downloading emails, and IMAP for receiving emails while keeping them on the server.

Practice

1. Which protocol is primarily used to send emails from a client to a mail server?

easy

A. IMAP

B. SMTP

C. POP3

D. FTP

Solution

1. Step 1: Understand the role of SMTP

   SMTP stands for Simple Mail Transfer Protocol and is designed to send emails from a client to a mail server or between servers.

2. Step 2: Differentiate from POP3 and IMAP

   POP3 and IMAP are used to receive emails, not send them. FTP is unrelated to email sending.

3. Final Answer:

   SMTP -> Option B

4. Quick Check:

   Sending emails = SMTP [OK]

Hint: Sending email? Think SMTP first. [OK]

Common Mistakes:

• Confusing POP3 or IMAP as sending protocols
• Choosing FTP which is unrelated to email
• Mixing sending and receiving roles

2. Which of the following is the correct port number commonly used by POP3 for receiving emails?

easy

A. 143

B. 25

C. 110

D. 80

Solution

1. Step 1: Recall standard port numbers for email protocols

   POP3 commonly uses port 110 for unencrypted connections.

2. Step 2: Identify other ports

   Port 25 is for SMTP, 143 is for IMAP, and 80 is for HTTP (web traffic).

3. Final Answer:

   110 -> Option C

4. Quick Check:

   POP3 port = 110 [OK]

Hint: POP3 uses port 110 to receive emails. [OK]

Common Mistakes:

• Mixing SMTP port 25 with POP3
• Confusing IMAP port 143 with POP3
• Choosing port 80 which is for web

3. Consider this scenario: A user accesses their email from two devices using IMAP. They delete an email on device A. What happens on device B?

medium

A. The email is also deleted on device B automatically.

B. The email remains on device B until manually deleted.

C. The email is downloaded again on device B.

D. The email is moved to the spam folder on device B.

Solution

1. Step 1: Understand IMAP synchronization

   IMAP keeps emails on the server and syncs changes across all devices connected to that account.

2. Step 2: Apply deletion effect across devices

   Deleting an email on one device removes it from the server, so it disappears from all devices including device B.

3. Final Answer:

   The email is also deleted on device B automatically. -> Option A

4. Quick Check:

   IMAP syncs deletions across devices [OK]

Hint: IMAP syncs all changes across devices instantly. [OK]

Common Mistakes:

• Thinking emails stay on other devices after deletion
• Confusing IMAP with POP3 behavior
• Assuming emails move to spam automatically

4. A user complains that after checking emails on their phone, the messages disappear from their laptop. Which protocol is likely causing this behavior?

medium

A. SMTP

B. IMAP

C. HTTP

D. POP3

Solution

1. Step 1: Analyze the behavior described

   Emails disappearing from one device after checking on another suggests emails are downloaded and removed from the server.

2. Step 2: Identify protocol matching this behavior

   POP3 downloads emails and deletes them from the server, causing them to vanish on other devices.

3. Final Answer:

   POP3 -> Option D

4. Quick Check:

   Emails removed from server after download = POP3 [OK]

Hint: POP3 removes emails from server after download. [OK]

Common Mistakes:

• Confusing IMAP which keeps emails on server
• Choosing SMTP which is for sending
• Selecting HTTP which is unrelated

5. A company wants employees to access their emails from multiple devices and keep messages synchronized, including read/unread status and folders. Which protocol should they choose and why?

hard

A. IMAP, because it keeps emails on the server and syncs changes.

B. POP3, because it downloads emails for offline use.

C. SMTP, because it sends emails reliably.

D. FTP, because it transfers files quickly.

Solution

1. Step 1: Understand company needs

   They want multiple device access with synchronized email status and folders.

2. Step 2: Match protocol features

   IMAP keeps emails on the server and syncs all changes like read status and folders across devices.

3. Step 3: Eliminate other options

   POP3 downloads and removes emails, SMTP only sends emails, FTP is unrelated to email.

4. Final Answer:

   IMAP, because it keeps emails on the server and syncs changes. -> Option A

5. Quick Check:

   Multi-device sync = IMAP [OK]

Hint: For syncing emails on many devices, use IMAP. [OK]

Common Mistakes:

• Choosing POP3 which does not sync across devices
• Confusing SMTP with receiving protocols
• Selecting FTP which is not for email