Computer Networking A Top-Down Approach 7th

1.  Home Self-Assessment Multiple Choice Quiz Chapter 3
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Self-Assessment Multiple Choice Quiz
Chapter 3: Transport Layer
Consider the latency model for dynamic congestion windows. Which of the following
components contribute to latency
When a TCP segment arrives to a host, the socket to which the segment is directed
depends on
UDP h hi h f h f ll i h i i
Computer Networking: a Top-Down
Approach, 7th Edition
Kurose • Ross
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round trip time, RTTround trip time, RTT
the transmission time of the object, O/Rthe transmission time of the object, O/R
the sum of all the stalled timesthe sum of all the stalled times
all of the aboveall of the above
the destination port numberthe destination port number
the source port numberthe source port number
the source IP address of the datagram that encapsulated the segmentthe source IP address of the datagram that encapsulated the segment
all of the aboveall of the above

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UDP has which of the following characteristics:
When a UDP segment arrives to a host, in order to direct the segment to the
appropriate socket, the OS uses
The stop-and-wait protocol is highly ine cient when
three-way hand shake for connection establishmentthree-way hand shake for connection establishment
connection state at the serverconnection state at the server
regulated send rateregulated send rate
none of the abovenone of the above
the destination port numberthe destination port number
the source IP addressthe source IP address
the source port numberthe source port number
all of the aboveall of the above
when there is a large distance between source and destination and thewhen there is a large distance between source and destination and the
transmission rate is lowtransmission rate is low
when there is a large distance between source and destination and thewhen there is a large distance between source and destination and the
transmission rate is hightransmission rate is high
when there is a short distance between source and destination and thewhen there is a short distance between source and destination and the
transmission rate is largetransmission rate is large
when there is a short distance between source and destination and thewhen there is a short distance between source and destination and the
transmission rate is lowtransmission rate is low

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Pipelining requires which of the following
TCP applies fast retransmit to a segment when
Nmap is often used to:
transmitting many packets before receiving acknowledgementstransmitting many packets before receiving acknowledgements
unique sequence numbers for each in-transit packetunique sequence numbers for each in-transit packet
sender-side buffering of unacknowledged packetssender-side buffering of unacknowledged packets
all of the aboveall of the above
it estimates unusually large RTTsit estimates unusually large RTTs
the segment's timer expiresthe segment's timer expires
when it receives three ACKs for an earlier segmentwhen it receives three ACKs for an earlier segment
none of the abovenone of the above
Decipher encrypted trafficDecipher encrypted traffic
Measure throughput between hostsMeasure throughput between hosts
Measure round-trip times between hosts.Measure round-trip times between hosts.
Do port scans over a range of ports at a target host.Do port scans over a range of ports at a target host.

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With SYN cookies, when a server receives a SYN segment, it returns a SYNACK with:
Over a TCP connection, suppose host A sends two segments to host B, host B sends
an acknowledgement for each segment, the rst acknowledgement is lost, but the
second acknowledgement arrives before the timer for the rst segment expires.
Consider the latency model for dynamic congestion windows. The value P is equal to
with an initial sequence number that is a hash of the IP addresses and portwith an initial sequence number that is a hash of the IP addresses and port
numbers in the SYN segment (as well as of other things).numbers in the SYN segment (as well as of other things).
with a randomly chosen initial sequence number;with a randomly chosen initial sequence number;
initial sequence number 1;initial sequence number 1;
none of the above.none of the above.
Host A will retransmit the second segmentHost A will retransmit the second segment
Host A will retransmit the first segmentHost A will retransmit the first segment
Host A will retransmit both segmentsHost A will retransmit both segments
Host A will retransmit neither segmentsHost A will retransmit neither segments
RTT/ORTT/O
the number of times the server stallsthe number of times the server stalls
the number of windows that cover the objectthe number of windows that cover the object
none of the abovenone of the above

5. 12
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Consider the latency model for static congestion windows. If the server receives an
acknowledgement for the rst data segment in the rst window before the server
completes the transmission of the rst window, then the latency for an object of size
O is:
In a TCP connection, suppose that loss occurs whenever the window size of a
connection hits W. Also suppose that the RTT is constant. Then the approximate
average transmission rate is
See Results
Reset / Start Over
Latency = 2 RTTLatency = 2 RTT
Latency = 2 RTT + O/RLatency = 2 RTT + O/R
Latency = 2 RTT + O/R + (K-1) [S/R + RTT - WS/R]Latency = 2 RTT + O/R + (K-1) [S/R + RTT - WS/R]
Latency = 2 RTT + O/R - S/R - RTT + WS/RLatency = 2 RTT + O/R - S/R - RTT + WS/R
MSS/RTTMSS/RTT
W*MSS/2 RTTW*MSS/2 RTT
W*MSS/RTTW*MSS/RTT
.75 W*MSS/RTT.75 W*MSS/RTT

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