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cs6250 - exam 1/141 Questions and Answers/100% Scores
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cs6250 - exam 1/141 Questions andAnswers/100% Scores
How did Licklider and his team in the early 1960s experiment with a
precursor to the internet? - -Connecting two computers over a dial-up
telephone line
-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
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