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Free Practice Quiz Question List

2 Common TCP Ports and Services Online Quiz Questions

Use this free practice quiz with 20 questions to review 2 Common TCP Ports and Services, test your knowledge, and prepare for your next test or exam.

20 questions
01
Fill in the blank
1 point

Telnet, an older unencrypted remote terminal protocol, is commonly associated with TCP port .

02
Written response
1 point

What TCP port is commonly associated with SMTP, the service that transfers email between mail servers? Enter the port number.

03
Fill in the blank
1 point

HTTP web traffic without TLS by default is commonly associated with TCP port .

04
Choose one
1 point

A network administrator sees FTP traffic on TCP port 21. Which interpretation best describes the usual role of this connection?

  1. A

    It carries FTP file data, and its port is always 20.

  2. B

    It carries FTP commands and responses; file data uses a separate connection.

  3. C

    It carries encrypted remote login commands.

  4. D

    It carries email between mail servers.

05
Choose one
1 point

A browser connects to a website using HTTP protected with TLS. Which service and common TCP port match this traffic?

  1. A

    HTTP without TLS by default, TCP port 80

  2. B

    DNS over TCP, TCP port 53

  3. C

    HTTPS (HTTP protected with TLS), TCP port 443

  4. D

    SMTP, TCP port 25

06
True or false
1 point

SSH can support secure file-transfer tools such as SFTP, as well as encrypted remote login.

  1. A

    True

  2. B

    False

07
Written response
1 point

Which service is commonly associated with TCP port 22 for encrypted remote login and command-line administration?

08
True or false
1 point

DNS commonly uses UDP port 53, even though it can also use TCP port 53.

  1. A

    True

  2. B

    False

09
Choose one
1 point

For which transport protocols does IANA register Microsoft RDP on port 3389?

  1. A

    TCP only

  2. B

    Both TCP and UDP

  3. C

    UDP only

  4. D

    Neither TCP nor UDP

10
Choose all
1 point

Select all the services that provide graphical remote desktop access, allowing a user to view and control another computer's desktop.

  1. A

    SSH

  2. B

    Microsoft RDP

  3. C

    Telnet

  4. D

    RFB, commonly used by VNC

11
Choose all
1 point

Select all the reasons why a port number alone may not prove which application service is using it.

  1. A

    A service can be configured to use a nonstandard port.

  2. B

    A registered port always proves which application is using it.

  3. C

    A registered port may carry other traffic.

  4. D

    A port number by itself proves that a service is secure.

12
Written response
1 point

What protocol, commonly used by VNC for remote display and input, is associated with TCP port 5900?

13
Open ended
1 point

Compare SSH, RDP, VNC, and Telnet in terms of the kind of remote access they provide. Include the key security distinction between SSH and Telnet.

14
Written response
1 point

Which TCP port is listed for SMTP, the service that transfers email between mail servers?

15
Choose one
1 point

A firewall log shows TCP port 21 during an FTP session. Which interpretation best matches the role of this port?

  1. A

    Port 21 carries both FTP commands and all file data on the same connection.

  2. B

    Port 21 carries FTP commands and responses; file data uses a separate connection.

  3. C

    Port 21 is the standard port for encrypted remote command-line access.

  4. D

    Port 21 carries DNS queries only when TCP is used.

16
Choose one
1 point

A network engineer sees a DNS zone transfer using TCP. Which statement correctly describes the relevant port and protocol?

  1. A

    DNS uses TCP port 53 exclusively; UDP is not used for DNS.

  2. B

    TCP port 53 is used for email transfer between mail servers.

  3. C

    TCP port 53 can carry DNS queries and responses, including zone transfers; DNS also commonly uses UDP port 53.

  4. D

    TCP port 53 is the standard port for secure web traffic.

17
True or false
1 point

True or false: Telnet provides encrypted remote terminal access comparable to SSH.

  1. A

    True

  2. B

    False

18
Choose one
1 point

An unfamiliar application is communicating over a port commonly associated with a different service. What is the most accurate conclusion?

  1. A

    The port number proves which application is running because services cannot use nonstandard ports.

  2. B

    The port number is a useful clue, but it does not prove which application is using it.

  3. C

    The port number proves the traffic is encrypted if it is registered for a common service.

  4. D

    The port number identifies the host rather than an application service.

19
Choose one
1 point

A Windows remote-desktop service is configured on its common registered port. Which description correctly identifies the service and its registered transports?

  1. A

    It is used for encrypted command-line login and is registered only for TCP.

  2. B

    It is used for email transfer between mail servers and is registered for both TCP and UDP.

  3. C

    It is used for remote desktop access to a Windows computer and is registered for both TCP and UDP.

  4. D

    It is used for remote display through VNC and is registered only for UDP.

20
Choose one
1 point

A client must distinguish ordinary web traffic from HTTP protected with TLS. Which pairing is correct?

  1. A

    Port 80 is HTTP without TLS by default; port 443 is HTTPS protected with TLS.

  2. B

    Port 80 is HTTPS protected with TLS; port 443 is HTTP without TLS by default.

  3. C

    Both ports identify HTTP without TLS by default.

  4. D

    Both ports identify HTTPS protected with TLS.