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Which layer of the OSI model does UDP operate on?
a. Application layer
b. Network layer
c. Transport layer
d. Physical layer
Answer: c. Transport layerwikipedia+2
What is the main characteristic of UDP compared to TCP?
a. Reliable and ordered delivery
b. Connectionless and unreliable
c. Provides flow control
d. Provides error correction
Answer: b. Connectionless and unreliabletechtarget+2
What is the full form of UDP?
a. Unified Data Protocol
b. User Datagram Protocol
c. Universal Data Packet
d. Utility Data Process
Answer: b. User Datagram Protocolgeeksforgeeks+2
Which type of application commonly uses UDP?
a. Video streaming
b. Email transfer
c. File download
d. Web browsing
Answer: a. Video streamingfortinet+2
In UDP, messages are referred to as:
a. Segments
b. Frames
c. Datagrams
d. Packets
Answer: c. Datagramsbunny+2
UDP provides which service not provided by the IP layer?
a. Authentication
b. Port numbers
c. Flow control
d. Encryption
Answer: b. Port numberstutorialspoint+2
How does UDP handle lost messages?
a. Requests retransmission
b. Ignores loss
c. Reorders packets
d. Notifies sender
Answer: b. Ignores lossallabouttesting+2
What is the minimum size of a UDP header?
a. 8 bytes
b. 16 bytes
c. 4 bytes
d. 32 bytes
Answer: a. 8 byteslenovo+2
Which field in UDP header is optional in IPv4?
a. Source Port
b. Checksum
c. Length
d. Sequence number
Answer: b. Checksumwikipedia+2
What type of applications benefit most from UDP?
a. Applications needing guaranteed delivery
b. Time-sensitive communications
c. Large file transfers
d. Secure data transmissions
Answer: b. Time-sensitive communicationsgeeksforgeeks+2
UDP does NOT provide which of the following?
a. Ordered delivery
b. Port addressing
c. Error correction
d. Connection setup
Answer: a. Ordered deliverytechtarget+2
What happens if two UDP datagrams are sent in rapid succession?
a. They always arrive in order
b. Arrival order is not guaranteed
c. Second is always dropped
d. Both are merged
Answer: b. Arrival order is not guaranteedgeeksforgeeks+2
Which protocol does UDP run over?
a. ICMP
b. IP
c. ARP
d. HTTP
Answer: b. IPprepinsta+2
What does UDP use to identify applications on a host?
a. MAC address
b. Port number
c. IP address
d. Hostname
Answer: b. Port numbertutorialspoint+2
Which control mechanism is absent in UDP?
a. Congestion control
b. Checksum calculation
c. Port addressing
d. Data segmentation
Answer: a. Congestion controllenovo+2
What is one advantage of UDP over TCP?
a. Reliable delivery
b. Lower latency
c. Guaranteed order
d. Built-in security
Answer: b. Lower latencybunny+2
Which application layer protocol typically uses UDP?
a. FTP
b. DNS
c. SMTP
d. Telnet
Answer: b. DNSwikipedia+2
How does UDP react to congestion in the network?
a. Reduces transmission rate
b. Stops sending data
c. Continues sending data
d. Sends ACK packets
Answer: c. Continues sending datatechtarget+2
Which is a common use for UDP in networking?
a. Voice over IP (VoIP)
b. Secure web browsing
c. Email transfer
d. SSH sessions
Answer: a. Voice over IP (VoIP)fortinet+2
What happens if a UDP segment is corrupted?
a. It is automatically resent
b. It is dropped
c. Receiver asks for retransmission
d. A duplicate is created
Answer: b. It is droppedtutorialspoint+2
For periodic burst transfers, which protocol is preferable?
a. UDP
b. TCP
c. SMTP
d. FTP
Answer: a. UDPtestbook+2
Why is UDP considered “stateless”?
a. It stores previous communication states
b. Each transmission is independent
c. It maintains connection state
d. It uses sequence numbers
Answer: b. Each transmission is independentwikipedia+2
What is the primary disadvantage of UDP?
a. Slow speed
b. Data loss
c. Large header size
d. No port addressing
Answer: b. Data losslenovo+2
Which protocol is typically used for streaming audio?
a. TCP
b. UDP
c. SMTP
d. ICMP
Answer: b. UDPfortinet+2
UDP is best defined as:
a. Reliable, connection-oriented protocol
b. Simple, connectionless protocol
c. Protocol with flow control
d. Protocol with guaranteed order
Answer: b. Simple, connectionless protocolclimbtheladder+2
What is the role of ports in UDP?
a. Store packet data
b. Identify destination application
c. Control flow
d. Encrypt datagrams
Answer: b. Identify destination applicationtechtarget+2
Which file transfer protocol can use UDP?
a. FTP
b. TFTP
c. HTTP
d. SSH
Answer: b. TFTPtutorialspoint+2
What does the UDP “length” field specify?
a. Header size only
b. Size of the datagram including the header
c. Number of datagrams sent
d. Port number range
Answer: b. Size of the datagram including the headerlenovo+2
UDP applications must often handle which task themselves?
a. Port assignment
b. Retransmission and error recovery
c. Host addressing
d. IP numbering
Answer: b. Retransmission and error recoveryclimbtheladder+2
Which protocol uses port 53 UDP?
a. FTP
b. Telnet
c. DNS
d. SMTP
Answer: c. DNSwikipedia+2
UDP’s header is considered:
a. Large and complex
b. Fixed and simple
c. Variable and encrypted
d. Dynamic and reliable
Answer: b. Fixed and simpletutorialspoint+2
If flow control is needed in UDP-based applications, what must happen?
a. UDP automatically provides it
b. The application must provide it
c. TCP is used instead
d. IP layer manages it
Answer: b. The application must provide ittestbook+2
Which protocol is NOT typically built on UDP?
a. SNMP
b. RIP
c. Telnet
d. Kerberos
Answer: c. Telnetlenovo+2
Which type of transmission does UDP support?
a. Reliable, multi-point transmission
b. Fast, best-effort delivery
c. Guaranteed delivery with handshakes
d. Ordered transmission only
Answer: b. Fast, best-effort deliverybunny+2
What occurs if a UDP packet arrives out of order?
a. Receiver reorders it
b. Packet is dropped
c. Application handles out-of-order
d. Packet is merged
Answer: c. Application handles out-of-ordertechtarget+2
What protocols typically use both TCP and UDP?
a. Domain Name System (DNS)
b. File Transfer Protocol (FTP)
c. Hypertext Transfer Protocol (HTTP)
d. Secure Shell (SSH)
Answer: a. Domain Name System (DNS)wikipedia+2
How does UDP handle acknowledgment of received data?
a. Automatic acknowledgment
b. No acknowledgment mechanism
c. Sequence number checking
d. Guaranteed receipt confirmation
Answer: b. No acknowledgment mechanismtechtarget+2
The UDP checksum is used primarily for:
a. Encryption
b. Port assignment
c. Data Integrity verification
d. Error correction
Answer: c. Data Integrity verificationtutorialspoint+2
In which scenario is UDP preferable over TCP?
a. Sending large documents
b. Streaming real-time audio or video
c. Secure email delivery
d. Reliable file transfer
Answer: b. Streaming real-time audio or videofortinet+2
Which statement is FALSE about UDP?
a. UDP provides congestion control
b. UDP header is simple
c. UDP does not reorder packets
d. UDP provides no flow control
Answer: a. UDP provides congestion controllenovo+2
UDP is especially useful when:
a. Reliable delivery is essential
b. Application can tolerate some data loss
c. All data must be encrypted
d. Order of data is guaranteed
Answer: b. Application can tolerate some data losstechtarget+2
Which protocol uses UDP port 161?
a. Telnet
b. SNMP
c. SMTP
d. FTP
Answer: b. SNMPwikipedia+2
What does it mean that UDP is “connectionless”?
a. Data sent after connection setup
b. Data sent without connection
c. Data sent in sequence
d. Data sent is acknowledged
Answer: b. Data sent without connectiongeeksforgeeks+2
Which field is NOT present in UDP header?
a. Source port
b. Urgent pointer
c. Checksum
d. Length
Answer: b. Urgent pointertutorialspoint+2
What is the purpose of the destination port in UDP?
a. Indicate packet size
b. Identify destination application
c. Specify encryption type
d. Determine hop count
Answer: b. Identify destination applicationwikipedia+2
Which protocol is used for routing information using UDP?
a. RIP
b. FTP
c. HTTP
d. Telnet
Answer: a. RIPlenovo+2
UDP multicast is often used in:
a. Online gaming
b. Secure file transfer
c. Web browsing
d. Email
Answer: a. Online gamingfortinet+2
What makes UDP suitable for real-time applications?
a. Guaranteed delivery
b. Minimal transmission delay
c. Built-in encryption
d. Automatic error correction
Answer: b. Minimal transmission delayprepinsta+2
UDP is classified under which transport mode?
a. Connection-oriented
b. Connectionless
c. Session-based
d. Reliable
Answer: b. Connectionlesstechtarget+2
What mechanism does UDP lack that is essential in TCP?
a. Sequence numbering
b. Flow control and error correction
c. Port addressing
d. Header checksum
Answer: b. Flow control and error correctionclimbtheladder+2

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