Chapter 3 - Computer Networking: A Top-
Down Approach UPDATED ACTUAL
Exam Questions and CORRECT Answers
end systems - CORRECT ANSWER - transport protocols run in ___
segment(s) - CORRECT ANSWER - app messages are broken into ____ by the send side,
and passed to the network layer
reassembles (into messages) - CORRECT ANSWER - the receiving side ____ segments
and passes them to the app layer
datagram - CORRECT ANSWER - term for network/IP packets
network layer - CORRECT ANSWER - logical communication between hosts
transport layer - CORRECT ANSWER - logical communication between processes
network layer - CORRECT ANSWER - the *transport layer* relies on and enhances _____
services
multiplexing at sender - CORRECT ANSWER - handle data from multiple sockets, add
transport header
demultiplexing at receiver - CORRECT ANSWER - use header info to deliver to deliver
received segments to the correct socket
source IP (address), destination IP (address) - CORRECT ANSWER - in
*demultiplexing*, each datagram received by the host has _____ and ____
, transport-layer segment - CORRECT ANSWER - in *demultiplexing*, each datagram
carries a(n) ____
IP address(es), port numbers - CORRECT ANSWER - in *demultiplexing*, the host uses
______ to direct a segment to the appropriate socket
destination port (#), socket, port (#) - CORRECT ANSWER - *(connectionless
demultiplexing)* when the host receives a UDP segment, it checks the ____ in the segment and
directs the segment to the _____ with that _____
destination IP (address), destination port (#) - CORRECT ANSWER - *(connectionless
demultiplexing)* when creating a datagram to send into a UDP socket, must specify _____ and
____
same destination port (#), same socket as destination - CORRECT ANSWER -
*(connectionless demultiplexing)* IP datagrams with the _____ but different source IP address
and/or source port numbers will be directed to the ____
socket - CORRECT ANSWER - interface between network layer and transport layer
used as return address - CORRECT ANSWER - why do we need the *source port* in
connectionless demux?
UDP socket tuple - CORRECT ANSWER - *(connectionless demux)*
<destination IP, destination port>
TCP socket tuple - CORRECT ANSWER - *(connection-oriented demux)*
Down Approach UPDATED ACTUAL
Exam Questions and CORRECT Answers
end systems - CORRECT ANSWER - transport protocols run in ___
segment(s) - CORRECT ANSWER - app messages are broken into ____ by the send side,
and passed to the network layer
reassembles (into messages) - CORRECT ANSWER - the receiving side ____ segments
and passes them to the app layer
datagram - CORRECT ANSWER - term for network/IP packets
network layer - CORRECT ANSWER - logical communication between hosts
transport layer - CORRECT ANSWER - logical communication between processes
network layer - CORRECT ANSWER - the *transport layer* relies on and enhances _____
services
multiplexing at sender - CORRECT ANSWER - handle data from multiple sockets, add
transport header
demultiplexing at receiver - CORRECT ANSWER - use header info to deliver to deliver
received segments to the correct socket
source IP (address), destination IP (address) - CORRECT ANSWER - in
*demultiplexing*, each datagram received by the host has _____ and ____
, transport-layer segment - CORRECT ANSWER - in *demultiplexing*, each datagram
carries a(n) ____
IP address(es), port numbers - CORRECT ANSWER - in *demultiplexing*, the host uses
______ to direct a segment to the appropriate socket
destination port (#), socket, port (#) - CORRECT ANSWER - *(connectionless
demultiplexing)* when the host receives a UDP segment, it checks the ____ in the segment and
directs the segment to the _____ with that _____
destination IP (address), destination port (#) - CORRECT ANSWER - *(connectionless
demultiplexing)* when creating a datagram to send into a UDP socket, must specify _____ and
____
same destination port (#), same socket as destination - CORRECT ANSWER -
*(connectionless demultiplexing)* IP datagrams with the _____ but different source IP address
and/or source port numbers will be directed to the ____
socket - CORRECT ANSWER - interface between network layer and transport layer
used as return address - CORRECT ANSWER - why do we need the *source port* in
connectionless demux?
UDP socket tuple - CORRECT ANSWER - *(connectionless demux)*
<destination IP, destination port>
TCP socket tuple - CORRECT ANSWER - *(connection-oriented demux)*
