CompTIA Network+ Certification (N10-003) Part 11

  • CompTIA Network+
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Quizzes Created: 23 | Total Attempts: 6,370
| Attempts: 234 | Questions: 30 | Updated: Jun 3, 2025
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1. Which of the following uses ports 20 and 21?

Explanation

FTP uses TCP port 20 for data and TCP port 21 for control.

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About This Quiz
CompTIA Network+ Certification (N10-003) Part 11 - Quiz

This CompTIA Network+ Certification quiz assesses knowledge on network protocols and configurations, including PPP, SMTP, and SSL. It is designed for network professionals aiming to validate their skills in managing and troubleshooting network infrastructure.

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2. Which port must you close on a firewall to prevent users from browsing the Internet?

Explanation

HTTP transmits data between a web browser and the Internet. HTTP uses TCP port 80. Thus, closing TCP port 80 will prevent users from accessing the Internet.

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3. Which of the following uses port 22?

Explanation

Secure Shell (SSH) uses TCP port 22.

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4. What is the default TCP port used by HTTP?

Explanation

The default port for HTTP is TCP port 80.

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5. Which of the following uses port 443?

Explanation

HTTPS uses TCP port 443.

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6. You are working as a network technician.  A developer wants to know what is the default port that listens to the URL https://www.google.com.  How do you answer?

Explanation

Web browsers use HTTP to access web sites. The default port for HTTP is TCP port 80.

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7. Which of the following provides name resolution on the Internet?

Explanation

The Internet uses host names and DNS is responsible for host name resolution.

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8. Which ports must you open on a firewall to allow FTP traffic? (choose all that apply)

Explanation

FTP uses TCP port 20 for data and TCP port 21 for control.

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9. SMTP is identified by which of the following well-known TCP/IP ports?

Explanation

TCP port 25 is the default port SMTP

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10. You work as a network technician.  You are asked to troubleshoot a problem where a user is unable to connect to a File Transfer Protocol (FTP) server even if port 21 is unblocked on the corporate firewall.  What is the most probable cause of this problem?

Explanation

FTP uses both TCP port 21 and port 22. TCP port 21 is used for control while TCP port 20 is used for data. Therefore, you should unblock both port 20 and 21.

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11. What is the default TCP port used by HTTPS?

Explanation

The default port for HTTPS is TCP port 443.

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12. You want to determine which IP address www.google.com resolves to.  Which of the following types of servers is required to accomplish this?

Explanation

DNS is responsible for resolving host names like www.google.com to an IP address.

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13. Which of the following uses port 23?

Explanation

Telnet uses TCP port 23.

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14. Which of the following provides NetBIOS name to IP address resolution?

Explanation

WINS provides NetBIOS name to IP address resolution.

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15. Which of the following uses port 143?

Explanation

IMAP4 uses TCP port 143.

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16. Which of the following ports is required by Secure Shell?

Explanation

Secure Shell (SSH) uses TCP port 22.

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17. You work as a network administrator and you've been asked to configure a Microsoft Exchange server for e-mail services at a branch office.  The Exchange server has to be able to send e-mail to the main office that uses a Novel GroupWise e-mail server.  What protocol is needed to send e-mail between the two servers?

Explanation

Simple Mail Transfer Protocol (SMTP) is used for transfering e-mail messages between servers.

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18. Which of the following ports should be allowed to pass the corporate firewall to allow a remote user to log onto a corporate server using the SSH terminal from home?

Explanation

SSH uses TCP port 22. Therefore, this port should be redirected from the router to the IP address to allow SSH terminal connectivty.

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19. When using a modem for dial-up networking in Windows which of the following protocols is normally used to establish the connection?

Explanation

The PPP protocol is used to establish a connection over point-to-point links such as dial-up and dedicated leased lines.

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20. You are a senior network technician.  A trainee asks you which of the following protocols is used for error reporting in IP.  How do you answer?

Explanation

Internet Control Message Protocol (ICMP) is used for network management and control. It provides error testing and reporting for TCP/IP.

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21. Which of the following cannot be used for remote connections?

Explanation

IMAP4 transmit e-mail between the e-mail client and the e-mail server. This does not allow remote connections.

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22. Which ports must you open on a firewall to allow e-mail communications? (choose all that apply)

Explanation

TCP port 25 is used by SMTP which transmits e-mail from one server to another. TCP port 110 is used by POP3 to transmit e-mail betwen server and clients.

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23. Which of the following provides HOST name to IP address resolution?

Explanation

DNS provides host name to IP address resolution.

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24. You are a network technician.   Your boss asks if it is possible to encrypt data between web browser and web server.  You answer that it is possible but it requires the use of ______.

Explanation

Secure Socket Layer (SSL) provides secure Session Layer connections over the Internet between a web browser and web server.

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25. Which of the following ports allow secure HTTP traffic?

Explanation

HTTPS provides secure HTTP traffic uses TCP port 443 and not TCP port 80.

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26. Which of the following network services provides name resolution? (choose all that apply)

Explanation

DNS provides host name to IP address resolution while WINS provides NetBIOS name to IP address resolution.

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27. You work as a network engineer.  You have been asked to verify that the Simple Mail Transfer Protocol (SMTP) service is running on a remote server in a branch office.  The server does not allow Remote Desktop connections.  You know that you can test the SMTP port with telnet but on what port number should you establish the session?

Explanation

To check if SMTP is running test port 25.

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28. You work as a network administrator and you have been asked to setup a new mail server in a new domain on your network.  Which DNS records would you request to be created before e-mail can be received from the Internet to the new e-mail server?

Explanation

The MX record points to the mail exchanger for a particular host. This ensures that e-mail for a particular host will go to the correct mail exchanger. However, e-mail addresses use host names but computers use IP addresses. Therefore, we also need to translate host names to IP addresses. The Address (A) record maps a host name to an IP address.

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29. You are working as a senior network technician.  One of your trainees has some questions about name resolution.  He says he knows about DNS name resolution but wonders what is required in order to resolve Network Basic Input/Output System (NetBIOS) name to Internet Protocol (IP) address resolution.  How would you answer?

Explanation

LMHOSTS and WINS provides NetBIOS name to IP address resolution.

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30. Which of the following provides remote logon over the Internet?

Explanation

The PPP protocol is used to establish a connection over point-to-point links such as dial-up and dedicated leased lines that are used to connect to the Internet.

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Which of the following uses ports 20 and 21?
Which port must you close on a firewall to prevent users from browsing...
Which of the following uses port 22?
What is the default TCP port used by HTTP?
Which of the following uses port 443?
You are working as a network technician.  A developer wants to...
Which of the following provides name resolution on the Internet?
Which ports must you open on a firewall to allow FTP traffic? (choose...
SMTP is identified by which of the following well-known TCP/IP ports?
You work as a network technician.  You are asked to troubleshoot...
What is the default TCP port used by HTTPS?
You want to determine which IP address www.google.com resolves...
Which of the following uses port 23?
Which of the following provides NetBIOS name to IP address resolution?
Which of the following uses port 143?
Which of the following ports is required by Secure Shell?
You work as a network administrator and you've been asked to configure...
Which of the following ports should be allowed to pass the corporate...
When using a modem for dial-up networking in Windows which of the...
You are a senior network technician.  A trainee asks you which of...
Which of the following cannot be used for remote connections?
Which ports must you open on a firewall to allow e-mail...
Which of the following provides HOST name to IP address resolution?
You are a network technician.   Your boss asks if it is...
Which of the following ports allow secure HTTP traffic?
Which of the following network services provides name resolution?...
You work as a network engineer.  You have been asked to...
You work as a network administrator and you have been asked to...
You are working as a senior network technician.  One of your...
Which of the following provides remote logon over the Internet?
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