CS6250 COMPUTER NETWORK EXAM 1
QUESTIONS WITH VERIFIED ANSWERS
2026 | Latest Questions | A+
• What is the Domain Name System (DNS) designed to do primarily? -✓✓Translate
domain names into IP addresses
• What is the architectural design of the Internet protocol stack based on? -✓✓Layers
• T/F: Both the data link and transports layer protocols may provide error correction -
✓✓True
• What allows for communication between the applications layer and the transport layer
-✓✓Sockets
• Which of the following protocols belong to the application layer?
[ethernet/DNS/UDP/IP] -✓✓DNS
• Which two protocols belong to the transport layer? [IP/TCP/UDP/HTTP] -✓✓TCP,
UDP
• When an application sends a packet of information across the network, this packet
travels down the IP stack and undergoes what process -✓✓Encapsulation
• According to the end-to-end principle, where should most of the Internet's
functionality/intelligence be implemented? -✓✓At the edges of the network
• What is the difference between hubs, bridges, and routers? -✓✓They operate on
different layers of the IP stack
• T/F: the UDP and TCP protocols have a large overlap of functionality -✓✓false
• T/F: the transport layer protocols offer a logical connection between processes, only if
the hosts reside in the same network -✓✓false
• T/F: a sender host receives a message from the application layer it encapsulates it
with the transport layer header before passing it down to the network layer -✓✓true
• T/F: an application running on a host can bind to multiple sockets simultaneously -
✓✓true
, • T/F: a host cannot maintain a TCP socket and a UDP socket simultaneously -✓✓false
• T/F: the identifier of a UDP socket is a tuple of destination IP address and port -
✓✓true
• T/F: the identifier of a TCP socket is a tuple of source IP address and port -✓✓false
• T/F: UDP is considered more lightweight than TCP -✓✓true
• T/F: when two hosts use UDP to send and receive messages, they need to signal the
end of sending data to each other when they are done -✓✓false
• T/F: one of the functionalities that UDP offers is to increase or decrease the pace with
which the sender sends data to the receiver -✓✓false
• T/F: UDP offers basic error checking -✓✓true
• T/F: assume hosts A, B, and C. Host A has a UDP socket with port 123. Hosts B and
C each send their own UDP segment to Host A. Hosts B and C cannot use the same
destination port 123 for sending their UDP segment -✓✓false
• T/F: TCP offers in order delivery of packets, flow control, and congestion control -
✓✓true
• T/F: TCP detects packet loss using timeouts and triple duplicate acknowledgements -
✓✓true
• T/F: flow control is a rate control mechanism to protect the receiver's buffer from
overflowing -✓✓true
• T/F: congestion control is a rate control mechanism to protect the network from
congestion -✓✓true
• T/F: in TCP, the number of unacknowledged segments that a sender can have is the
minimum of the congestion window and the receive window -✓✓true
• T/F: consider the following TCP Reno, congestion window is cut in half in both of the
following events:
a) a timeout occurs
b) a triple duplicate acknowledgement occurs -✓✓false
• T/F: consider a TCP connection and a diagram that shows the congestion as it
progresses over time. From the diagram, when we observe the congestion window to
drop to its initial value, we infer that a packet loss occurred -✓✓true
QUESTIONS WITH VERIFIED ANSWERS
2026 | Latest Questions | A+
• What is the Domain Name System (DNS) designed to do primarily? -✓✓Translate
domain names into IP addresses
• What is the architectural design of the Internet protocol stack based on? -✓✓Layers
• T/F: Both the data link and transports layer protocols may provide error correction -
✓✓True
• What allows for communication between the applications layer and the transport layer
-✓✓Sockets
• Which of the following protocols belong to the application layer?
[ethernet/DNS/UDP/IP] -✓✓DNS
• Which two protocols belong to the transport layer? [IP/TCP/UDP/HTTP] -✓✓TCP,
UDP
• When an application sends a packet of information across the network, this packet
travels down the IP stack and undergoes what process -✓✓Encapsulation
• According to the end-to-end principle, where should most of the Internet's
functionality/intelligence be implemented? -✓✓At the edges of the network
• What is the difference between hubs, bridges, and routers? -✓✓They operate on
different layers of the IP stack
• T/F: the UDP and TCP protocols have a large overlap of functionality -✓✓false
• T/F: the transport layer protocols offer a logical connection between processes, only if
the hosts reside in the same network -✓✓false
• T/F: a sender host receives a message from the application layer it encapsulates it
with the transport layer header before passing it down to the network layer -✓✓true
• T/F: an application running on a host can bind to multiple sockets simultaneously -
✓✓true
, • T/F: a host cannot maintain a TCP socket and a UDP socket simultaneously -✓✓false
• T/F: the identifier of a UDP socket is a tuple of destination IP address and port -
✓✓true
• T/F: the identifier of a TCP socket is a tuple of source IP address and port -✓✓false
• T/F: UDP is considered more lightweight than TCP -✓✓true
• T/F: when two hosts use UDP to send and receive messages, they need to signal the
end of sending data to each other when they are done -✓✓false
• T/F: one of the functionalities that UDP offers is to increase or decrease the pace with
which the sender sends data to the receiver -✓✓false
• T/F: UDP offers basic error checking -✓✓true
• T/F: assume hosts A, B, and C. Host A has a UDP socket with port 123. Hosts B and
C each send their own UDP segment to Host A. Hosts B and C cannot use the same
destination port 123 for sending their UDP segment -✓✓false
• T/F: TCP offers in order delivery of packets, flow control, and congestion control -
✓✓true
• T/F: TCP detects packet loss using timeouts and triple duplicate acknowledgements -
✓✓true
• T/F: flow control is a rate control mechanism to protect the receiver's buffer from
overflowing -✓✓true
• T/F: congestion control is a rate control mechanism to protect the network from
congestion -✓✓true
• T/F: in TCP, the number of unacknowledged segments that a sender can have is the
minimum of the congestion window and the receive window -✓✓true
• T/F: consider the following TCP Reno, congestion window is cut in half in both of the
following events:
a) a timeout occurs
b) a triple duplicate acknowledgement occurs -✓✓false
• T/F: consider a TCP connection and a diagram that shows the congestion as it
progresses over time. From the diagram, when we observe the congestion window to
drop to its initial value, we infer that a packet loss occurred -✓✓true
