Free Practice Quiz Question List

3 Common UDP Ports and Services Online Quiz Questions

Use this free practice quiz with 20 questions to review 3 Common UDP Ports and Services, test your knowledge, and prepare for your next test or exam.

20 questions

Choose one

1 point

An application requires messages to arrive in order and be retransmitted if lost. Which statement best describes what it must do when using UDP?

A
UDP guarantees delivery, but not ordering or retransmission.
B
UDP does not guarantee delivery, ordering, or retransmission; the application must provide needed behaviors or use another transport.
C
UDP guarantees ordering, but not delivery.
D
UDP automatically retransmits every lost datagram.

Choose one

1 point

In an IPv4 DHCP exchange, which port direction is correct for a client's request and the server's reply?

A
The client sends requests to port 68, and the server replies to port 67.
B
Both requests and replies use server port 67.
C
The client sends requests to server port 67, and replies go to client port 68.
D
The client sends requests to port 69, and the server replies to port 70.

Choose one

1 point

A team is configuring a voice-call application that carries media with RTP over UDP. What should it expect about the UDP port used for each session?

A
Use a port selected or negotiated for the session; RTP has no single universal UDP port.
B
Always use UDP port 69 because it is used for file transfers.
C
Always use UDP port 123 because it is used for time synchronization.
D
Use UDP port 53 because it is used for name lookups.

Choose all

1 point

Select all correct statements about DNS transport and port use.

A
Most routine DNS queries use UDP port 53.
B
DNS uses UDP only and never uses TCP.
C
DNS also uses TCP port 53, including for zone transfers and other cases requiring TCP.
D
DNS uses TCP port 69 for zone transfers.

Choose all

1 point

Select all correct statements about the typical SNMP UDP port roles.

A
Managers commonly query agents on port 162.
B
Managers commonly query agents on port 161.
C
Notification receivers commonly listen on port 161 for traps.
D
Notification receivers commonly listen on port 162 for traps or other notifications.

True or false

1 point

A TFTP file exchange can use transfer ports selected for the session after the initial request to server port 69.

A
True
B
False

True or false

1 point

DHCP for IPv6 uses the same UDP server and client ports as IPv4: 67 and 68.

A
True
B
False

Written response

1 point

What UDP port is associated with NTP, which synchronizes computer clocks with time servers?

Written response

1 point

What UDP port does a DHCPv6 server use?

Fill in the blank

1 point

The protocol used to synchronize computer clocks with time servers is .

Fill in the blank

1 point

A familiar UDP port number indicates a conventional service, but it does not prove that the service is there.

Open ended

1 point

An administrator sees traffic addressed to a familiar UDP port and assumes the corresponding conventional service is running on the destination host. Explain why that conclusion is not justified by the port number alone.

Choose one

1 point

A device administrator is considering TFTP for transferring configuration files. Which security concern should guide how the service is deployed?

A
It automatically encrypts every file transfer.
B
It has no built-in login or access control, so it should be carefully restricted.
C
It guarantees delivery and retransmits all lost datagrams.
D
It can only transfer files using TCP.

Written response

1 point

Which built-in access-limiting capability does TFTP lack? Enter either the general capability or the related authentication feature.

Written response

1 point

A host is configured to synchronize its clock with a time server using the standard NTP service. Which UDP port should the host contact?

True or false

1 point

True or false: DNS uses UDP port 53 for many routine queries and also uses TCP port 53 in some cases.

A
True
B
False

Choose one

1 point

What does UDP port 123 conventionally indicate, and what does the port assignment alone establish about whether the service is running?

A
UDP port 123 is conventionally associated with NTP, but that assignment alone does not prove NTP is running.
B
NTP must be running because UDP port 123 is assigned to it.
C
UDP port 123 proves the host is running a service that uses TCP.

Choose one

1 point

A firewall rule must allow the standard IPv4 DHCP exchange. Which port direction matches a client's request and the server's reply?

A
Client requests go to port 68, and server replies go to port 67.
B
Both client requests and server replies use port 67.
C
Client requests go to server port 67, and server replies go to client port 68.
D
Client requests go to server port 69, and server replies go to client port 68.

Choose one

1 point

An administrator is configuring SNMP monitoring. Which assignment correctly distinguishes manager queries from notification reception?

A
Managers query agents on port 161; notification receivers commonly listen on port 162.
B
Managers query agents on port 162; notification receivers commonly listen on port 161.
C
Both queries and notifications use port 161 exclusively.
D
Both queries and notifications use port 162 exclusively.

Choose one

1 point

A device begins a TFTP file transfer by sending a request to the server's standard port. Which behavior should a firewall administrator expect after that initial request?

A
The initial request and all file data must remain on server port 69.
B
The request begins at server port 69, then the exchange uses session-selected transfer ports.
C
The request begins at server port 67, then the exchange moves to client port 68.
D
The request begins at server port 123, then the exchange uses a fixed port for every session.

3 Common UDP Ports and Services Online Quiz Questions

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