CS6250 COMPUTER NETWORK EXAM 1
QUESTIONS WITH VERIFIED ANSWERS
2026 | Complete Review Pack | 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
• Both the data link and transports layer protocols may provide error correction -
✓✓True
• What allows for communication between the application layer and the transport layer?
-✓✓Sockets
• Which of the following protocols belong to the application layer?
Ethernet
IP (Internet Protocol)
DNS (Domain Name Service)
UDP (User Datagram Protocol) -✓✓DNS (Domain Name Service)
• Which two protocols belong to the transport layer?
UDP
TCP
HTTP
IP -✓✓UDP and TCP
• 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 a network
, • What is the difference between hubs, bridges, and routers? -✓✓They operate on
different layers of the IP stack
• The transport layer protocols offer a logical connection between processes only if the
hosts reside in the same network -✓✓False
• A sending host receives a message from the application layer and encapsulates it with
the transport layer header before passing it down to the network layer -✓✓True
• An application running on a host can bind to multiple sockets simultaneously -✓✓True
• The identifier of a UDP socket is a tuple of destination IP address and port -✓✓True
• The identifier of a TCP socket is a tuple of source IP address and port -✓✓False
• UDP is considered more lightweight than TCP -✓✓True
• One of the functionalities that UDP offers is to increase or decrease the pace with
which the sender sends data to the receiver -✓✓False
• UDP offers basic error checking -✓✓True
• 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
• TCP offers in-order delivery of the packets, flow control, and congestion control -
✓✓True
• TCP detects packet loss using timeouts and triple duplicate acknowledgements -
✓✓True
• Flow control is a rate control mechanism to protect the receiver's buffer from
overflowing -✓✓True
• Congestion control is a rate control mechanism to protect the network from congestion
-✓✓True
• In TCP, the number of unacknowledged segments that a sender can have is the
minimum of the congestion window and the receive window. -✓✓True
• Consider the 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
QUESTIONS WITH VERIFIED ANSWERS
2026 | Complete Review Pack | 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
• Both the data link and transports layer protocols may provide error correction -
✓✓True
• What allows for communication between the application layer and the transport layer?
-✓✓Sockets
• Which of the following protocols belong to the application layer?
Ethernet
IP (Internet Protocol)
DNS (Domain Name Service)
UDP (User Datagram Protocol) -✓✓DNS (Domain Name Service)
• Which two protocols belong to the transport layer?
UDP
TCP
HTTP
IP -✓✓UDP and TCP
• 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 a network
, • What is the difference between hubs, bridges, and routers? -✓✓They operate on
different layers of the IP stack
• The transport layer protocols offer a logical connection between processes only if the
hosts reside in the same network -✓✓False
• A sending host receives a message from the application layer and encapsulates it with
the transport layer header before passing it down to the network layer -✓✓True
• An application running on a host can bind to multiple sockets simultaneously -✓✓True
• The identifier of a UDP socket is a tuple of destination IP address and port -✓✓True
• The identifier of a TCP socket is a tuple of source IP address and port -✓✓False
• UDP is considered more lightweight than TCP -✓✓True
• One of the functionalities that UDP offers is to increase or decrease the pace with
which the sender sends data to the receiver -✓✓False
• UDP offers basic error checking -✓✓True
• 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
• TCP offers in-order delivery of the packets, flow control, and congestion control -
✓✓True
• TCP detects packet loss using timeouts and triple duplicate acknowledgements -
✓✓True
• Flow control is a rate control mechanism to protect the receiver's buffer from
overflowing -✓✓True
• Congestion control is a rate control mechanism to protect the network from congestion
-✓✓True
• In TCP, the number of unacknowledged segments that a sender can have is the
minimum of the congestion window and the receive window. -✓✓True
• Consider the 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
