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Chapter 2 Application Layer
1.
In the following four descriptions, which one is
correct?
A
In C/S architecture, clients
communicate with each other directly.
B
In C/S architecture, client
has a fixed well-known address.
C
In P2P architecture, peers
communicate with each other directly.
D
In P2P architecture, peer
has a fixed well-known address.
2.
In
the
context
of
a
communication
session
between
a
pair
of
process,
the
process
that
initiates the communication is labeled
as the
,
the process that waits to be contacted to
begin the session is labeled as the
.
A
client process, server
process
B
sending process, receiving process
C
input process,
output process
D
communicating process, connecting
process
3. A socket is the interface
between
within a host.
A
the network layer and the
link layer
B
the
link layer and the physical layer
C
the application layer and
the transport layer
D
the transport layer and the network
layer
4. In the following applications,
which one is a loss-tolerant application?
A
E-mail
B
file transfer
C
instant
messaging
D
real-time audio
5. In the following applications, which
one is a bandwidth-sensitive application?
A
E-mail
B
web application
C
real-time audio
D
file transfer
6.
The service of TCP can’t guarantee
.
A
delivery of all data
without error
B
delivery of all data in the
proper order
C
the rate of delivery
D
congestion
control
7. In the following
applications, which one uses UDP?
1
A
E-mail
B
web application
C
file transfer
D
DNS
8
. In the following
descriptions about HTTP, which one is not correct?
A
HTTP uses non-persistent connections in
its default mode.
B
HTTP uses TCP as its underlying
transport protocol.
C
HTTP is a stateless protocol.
D
HTTP is
client-server architecture.
9.
Suppose a web page
consists of a base HTML file, 5 JEPG images and a
java applet, and
also
suppose
HTTP
uses
persistent
connection
without
pipelining,
the
total
response
time
is
.
A
2RTT
B
8RTT
C
12
RTT
D
14RTT
10. In
HTTP response message, if the requested HTTP
protocol
version is not
supported, the
status code is
.
A
200
B
301
C
400
D
505
1~5 CACDC 6~10 CDABD
11. The port number of web application
is
.
A
25
B
20
C
80
D
53
12.
A
network
entity
that
satisfies
HTTP
requests
on
the
behalf
of
an
origin
web
server
is
.
A
server farm
B
server stack
C
proxy server
D
edge server
13.
In the following descriptions about persistent
connection, which one is not correct?
A
The server
leaves the TCP connection open after sending a
response.
B
Each
TCP connection is closed after the server sending
one object.
C
There are two versions of persistent
connection: without pipelining and with
pipelining.
2
D
The default mode of HTTP
uses persistent connection with pipelining.
14. FTP uses two parallel TCP
connections to transfer a file, there are
.
A
control connection and data
connection
B
receiving connection and sending
connection
C
client connection and sever connection
D
program
connection and process connection
15.
In the following descriptions about FTP, which one
is correct?
A
FTP is p2p architecture.
B
FTP sends its control information out-
of-band.
C
FTP uses persistent connection.
D
FTP is a stateless protocol.
16. In the commands of FTP, which one
does not have parameter?
A USER
B PASS C LIST
D STOR
17. The Internet mail system
has three components which they are
.
A
user agent, SMTP, POP3
B
SMTP, POP3, IMAP
C
user agent,
SMTP, IMAP
D
user agent, SMTP, mail
server
18. If the status
code in HTTP response message is 404, it means
.
A
Request succeeded.
B
The requested document
doesn’t exit on this server.
C
This is
a generic
error
code
indicating
that
the
request
could
not
be
understood
by
the
server.
D
Requested object has been permanently
mover.
19. Comparison HTTP with SMTP,
the correct is
.
A
HTTP is a push
protocol, and SMTP is a pull protocol.
B
In the default
mode, both of them use persistent connection.
C
HTTP places
all of the message’s objec
ts into one
message, and SMTP sends every object
3
one by one.
D
HTTP requires each message
to be in 7-
bit ASCII format, and SMTP
doesn’t impose this
restriction.
20. The headers in the MIME message
must include except
.
A
From
B
Content-type
C
Content-transfer-encoding
D
MIME
version
11~15CCBAB 16~20 DDBBD
21. In the following protocol, which
one is stateless?
A
POP3
B
SMTP
C
FTP
D
IMAP
22. DNS means
.
A
Data Name System
B
Data National System
C
Domain Name
System
D
Domain National System
23.
There are three classes of DNS server except
.
A
Root DNS server
B
Local DNS server
C
TLD server
D
Authoritative DNS server
24.
DNS provides some services except
.
A
Host aliasing
B Mail server aliasing
C
Load
distribution
D
A
single point of failure
25. There are
three architectures for locating content in P2P
file sharing, KaZaA uses .
A
Centralized Directory
（
Napst
er
）
B Query Flooding(Gnutella)
C Exploiting Heterogeneity (p141)
D Incentive Priorities
4
26. There are three
architectures for locating content in P2P file
sharing, Napster uses .
A
Centralized Directory (p137)
B Query Flooding
C
Exploiting Heterogeneity
D
Incentive Priorities
27. The following
architectures in P2P file sharing, which is an
overlay network?
A Centralized
Directory
B Query
Flooding(p139)
C
Exploiting Heterogeneity
D
Incentive Priorities
28. The time it
takes for a small packet to travel from client to
server and then back to the
client is
.
A
round-travel time
B
next-hop time
C
round-trip
time
D
prefix-matching time
29. Suppose A ( with a Web-based e-mail
account ) sends a message to B ( who accesses his
mail server using POP3), which
application-layer protocol is not used?
A
HTTP
B
SMTP
C
POP3
D
IMAP
30. In the
four following options, which protocol is included
in Mail Access Protocol?
A
SMTP
B
DHCP
C
IMAP
D
FTP
31. In FTP commands,
is used to send
user password to the server.
A
User
B
Pass
C
Retr
D
Stor
32. The
function of the additional header field in MIME
Content-Type is
.
A
to convert the message body to its
origin non-ASCII form
B
to determine what actions it should
take on message body
5
C
to send an
E-mail to the receiving user agent
D
to indicate what type the
message is
33. In the four following
options, which application is organized as hybrid
of C/S and P2P
architecture?
A
E-mail
B
OICQ
C
File transfer
D
Web application
34. In the
four following options, which is not a centralized
DNS
design’s
problem?
A a single point of failure
B traffic volume
C
distant centralized database
D slow (maintenance)
35.
In
the
following
options,
from
the
application
developer’s
perspecti
ve,
which
is
not
correct?
A
the network architecture is
fixed
B
the
network architecture provides a specific set of
services to applications
C
the application architecture is
designed by the physical devices
D
the application
architecture dictates how the application is
organized over the various end
systems
36.
There
are
three
predominant
architectures
used
in
modern
network
applications,
which
one is not included?
A
the client-
server architecture
B
the P2P architecture
C
a hybrid of the client-
server and P2P architecture
D
a hybrid of the client-
server and browser-server architecture
37. In the following options about C/S
architecture, which is not correct?
A
In C/S
architecture, there is an always-on host, called
the server.
6
B
In C/S architecture, there
is an always-on host, called the
client
.
C
The server has a fixed, well-known
address, called IP address.
D
Clients do not directly
communicate with each other.
38.
are often used to create a powerful virtual
server in C/S architecture.
A Peers
B Server farm
C
server stack D local server
39.
A
process
sends
messages
into,
and
receives
messages
from,
the
network
through
its
.
A
socket
B
program
C
client
D
peer
40. Which one is not
defined by an application-layer protocol?
A
the types of messages exchanged
B
the syntax of
various message types
C
the semantics of the fields
D
rules for
determining when and how to translate the socket
41. HTTP can use two types of
connections, which are
.
A
persistent and non-persistent
connection
B
connection with pipelining and without
pipelining
C
TCP
and UDP
D
parallel and serial connection
42.
takes for a small packet to travel from
client to server and then back to the client.
A
RDT
B
threshold
C
RTT
D
overhead
43. The default
mode of HTTP uses
.
A
non-persistent connection with
pipelining
B
non-persistent connection without
pipelining
C
persistent connection with pipelining
7
D
persistent connection without
pipelining
44. In HTTP request
messages, the request line has three fields, there
are
.
A
the method
field, the URL field and the HTTP version field
B
the method,
the connection and URL field
C
the user-agent, the method
and HTTP version field
D
the user-agent, the URL and the HTTP
version field
45.
In
the
header
lines
of
HTTP
request
message,
if
the
field
of
Connection
is
close,
it
specifies
.
A
the host on which object resides
B
what type of
the user agent
C
that
the
browser
wants
the
server
to
close
the
connection
after
sending
the
requested
object
D
which language
can the browser receive
46. In HTTP
response message, if the status code is 404, it
means
.
A
request
succeeded and the information is returned in the
response
B
requested object has been permanently
moved
C
the
requested HTTP protocol version is not supported
by the server
D
the requested document does not exist
on this server
47.
is a network
entity that satisfies HTTP requests on the behalf
of an origin Web
server.
A
proxy server
B
local server
C
DNS server
D
Web server
48. In the following four options about
web cache, which one is not correct?
A
A web cache is
both a server and a client at the same time.
B
A web cache is
purchased and installed by an ISP.
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