This multiple choice quiz covers topics in Chapter 2 of the textbook "Computer Networking: A Top-Down Approach" including the application layer, HTTP, caching, and peer-to-peer file sharing protocols. It contains 12 questions testing knowledge of concepts like application layer protocols, HTTP request and response headers, DNS records, TCP vs UDP, and characteristics of BitTorrent file sharing.

1.  Home Self-Assessment Multiple Choice Quiz Chapter 2
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Self-Assessment Multiple Choice Quiz
Chapter 2: Application Layer
The transfer of an html le from one host to another is
A browser will generate header lines as a function of
Suppose a client sends an HTTP request message with the
If-modified-since:
Computer Networking: a Top-Down
Approach, 7th Edition
Kurose • Ross
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loss-tolerant and time sensitiveloss-tolerant and time sensitive
loss-intolerant and time sensitiveloss-intolerant and time sensitive
loss-intolerant and time insensitiveloss-intolerant and time insensitive
none of the abovenone of the above
browser type and versionbrowser type and version
user configuration of browseruser configuration of browser
whether the browser has a cached version of the requested objectwhether the browser has a cached version of the requested object
all of the aboveall of the above

2. 4
5
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:
Suppose the hit rate is .5 (instead of .4) in the caching example in the text. Then the
average delay is
SMTP is used to
Suppose a DNS resource record has Type=MX Then
200200 OKOK
404404 NotNot FoundFound
304304 NotNot ModifiedModified
none of the abovenone of the above
between 1.0 and 1.1 secondsbetween 1.0 and 1.1 seconds
between 1.2 and 1.3 secondsbetween 1.2 and 1.3 seconds
greater than two secondsgreater than two seconds
none of the abovenone of the above
to transfer messages from one mail server to anotherto transfer messages from one mail server to another
to transfer messages from mail server to a user agentto transfer messages from mail server to a user agent
to define the format of message headersto define the format of message headers
all of the aboveall of the above

3. 6
7
8
9
Suppose a DNS resource record has Type MX. Then
Local DNS name servers
Streams are not needed in which of the following programs:
Consider the minimum time for P2P le distribution, as discussed in Section 2.6.
Suppose the upload rate of the server is10 Mbps, the upload rates of all peers is 1
Value is the IP address of the mail server that has the alias hostname Name.Value is the IP address of the mail server that has the alias hostname Name.
Value is the hostname of the mail server that has the alias hostname Name.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 hostname of the DNS server that is authoritative for Name.
none of the abovenone of the above
never cache resource recordsnever cache resource records
cache resource records, but discard them after a period of time that is on thecache resource records, but discard them after a period of time that is on the
order of a few daysorder of a few days
cache resource records and never discard themcache resource records and never discard them
obtain resource records from Web cachesobtain resource records from Web caches
TCPclientTCPclient
TCPserverTCPserver
UDPclientUDPclient
UDPserverUDPserver

4. 10
11
Mbps, and the download rates of all peers is 10 Mbps. Further suppose that there are
100 peers and the le is 100 million bits. The minimum distribution time is
For BitTorrent, which of the following is true:
For the Web application, the user agent is
approximately 1 secondapproximately 1 second
approximately 10 secondsapproximately 10 seconds
approximately 1000 secondsapproximately 1000 seconds
approximately 100 secondsapproximately 100 seconds
Among the chunks that a peer does not have, the peer will request chunks thatAmong the chunks that a peer does not have, the peer will request chunks that
appear to be relatively rare in the torrent.appear to be relatively rare in the torrent.
Although a peer may have 50 concurrent TCP connections with other peers, atAlthough 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.any given instant of time it sends data to less than 10 other peers.
At a given instant of time, a peer A may upload to a peer B, even if peer B isAt a given instant of time, a peer A may upload to a peer B, even if peer B is
not sending anything to A.not sending anything to A.
All of the above.All of the above.
the user's keyboardthe user's keyboard
the user's monitorthe user's monitor
the user's mousethe user's mouse
none of the abovenone of the above

5. 12
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UDPUDP
TCPTCP
HTTPHTTP
none of the abovenone of the above