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Chapter 2 MC
Chapter 2 MC
This activity contains 10 questions.
The transfer of an html file from one host to another is
loss-tolerant and time sensitive
loss-intolerant and time insensitive
loss-intolerant and time sensitive
none of the above
A browser will generate header lines as a function of
browser type and version
user configuration of browser
whether the browser has a cached version of the requested object
all of the above
Suppose a client sends an HTTP request message with the
If-modified-since:
header. Suppose the object in a server has not changed since the last time a client retrieved the object. Then the server will send a response message with the status code:
304 Not Modified
404 Not Found
200 OK
none of the above
Suppose the hit rate is .5 (instead of .4) in the caching example in the text. Then the average delay is
between 1.0 and 1.1 seconds
between 1.2 and 1.3 seconds
greater than two seconds
none of the above
SMTP is used to
to transfer messages from one mail server to another
to define the format of message headers
to transfer messages from mail server to a user agent
all of the above
Suppose a DNS resource record has Type=MX. Then
Value is the hostname of the mail server that has the alias hostname Name.
Value is the hostname of the DNS server that is authoritative for Name.
Value is the IP address of the mail server that has the alias hostname Name.
none of the above
Local DNS name servers
never cache resource records
cache resource records and never discard them
cache resource records, but discard them after a period of time that is on the order of a few days
obtain resource records from Web caches
Streams are not needed in which of the following programs:
UDPclient
TCPserver
UDPserver
TCPclient
Consider the minimum time for P2P file distribution, as discussed in Section 2.6. Suppose the upload rate of the server is10 Mbps, the upload rates of all peers is 1 Mbps, and the download rates of all peers is 10 Mbps. Further suppose that there are 100 peers and the file is 100 million bits. The minimum distribution time is
approximately 10 seconds
approximately 1000 seconds
approximately 100 seconds
approximately 1 second
For BitTorrent, which of the following is true:
At a given instant of time, a peer A may upload to a peer B, even if peer B is not sending anything to A.
Although a peer may have 50 concurrent TCP connections with other peers, at any given instant of time it sends data to less than 10 other peers.
Among the chunks that a peer does not have, the peer will request chunks that appear to be relatively rare in the torrent.
All of the above.
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