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Chapter 3 MC
Chapter 3 MC
This activity contains 10 questions.
Consider the latency model for dynamic congestion windows. Which of the following components contribute to latency
the transmission time of the object, O/R
the sum of all the stalled times
round trip time, RTT
all of the above
When a TCP segment arrives to a host, the socket to which the segment is directed depends on
the source port number
the destination port number
the source IP address of the datagram that encapsulated the segment
all of the above
UDP has which of the following characteristics:
three-way hand shake for connection establishment
connection state at the server
regulated send rate
none of the above
When a UDP segment arrives to a host, in order to direct the segment to the appropriate socket, the OS uses
the source IP address
the source port number
the destination port number
all of the above
The stop-and-wait protocol is highly inefficient when
when there is a large distance between source and destination and the transmission rate is low
when there is a large distance between source and destination and the transmission rate is high
when there is a short distance between source and destination and the transmission rate is large
when there is a short distance between source and destination and the transmission rate is low
Pipelining requires which of the following
unique sequence numbers for each in-transit packet
sender-side buffering of unacknowledged packets
transmitting many packets before receiving acknowledgements
all of the above
TCP applies fast retransmit to a segment when
when it receives three ACKs for an earlier segment
the segment's timer expires
it estimates unusually large RTTs
none of the above
Nmap is often used to:
Measure throughput between hosts
Measure round-trip times between hosts.
Decipher encrypted traffic
Do port scans over a range of ports at a target host.
With SYN cookies, when a server receives a SYN segment, it returns a SYNACK with:
with a randomly chosen initial sequence number;
with 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).
initial sequence number 1;
none of the above.
Over a TCP connection, suppose host A sends two segments to host B, host B sends an acknowledgement for each segment, the first acknowledgement is lost, but the second acknowledgement arrives before the timer for the first segment expires.
Host A will retransmit neither segments
Host A will retransmit both segments
Host A will retransmit the second segment
Host A will retransmit the first segment
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