Computer Networking - Application Layer MCQs

This Portion of Computer Networking contains Computer Networking Application Layer MCQs (Multiple Choice Questions and Answers).

This Section covers below lists of topics.

1 INTRODUCTION

Providing Services
Application-Layer Paradigms

2 CLIENT-SERVERS PARADIGM

Application Programming Interface
Using Services of the Transport Layer

3 STANDARD CLIENT-SERVER APPLICATIONS

World Wide Web and HTTP
FTP
Electronic Mail
TELNET
Secure Shell (SSH)
Domain Name System (DNS)

4 PEERS-TO-PEER PARADIGM

P2P Networks
Distributed Hash Table (DHT)
Chord
Pastry
Kademlia
A Popular P2P Network: BitTorrent

5 SOCKET INTERFACE PROGRAMMING

Socket Interface in C

PRACTICE IT NOW TO SHARPEN YOUR CONCEPT AND KNOWLEDGE

1. In a client-server paradigm, a _ program provides services to a (another) _ program

client; client
client; server
server; client
server; server

2. In a client-server paradigm

both the server and the client must be running all the time.
both the server and the client need to be running only when they are needed.
the server must be running all the time but the client needs to be running only when it is needed.
the client must be running all the time but the server needs to be running only when it is needed

3. The first section of a URL identifier is the __________.

protocol
path
host
port

4. A _______ document is a fixed-content document that is created and stored in a server. The client can get a copy of the document only

static
dynamic
active
None of the choices are correct

5. ._____________ is a language for creating a static document

Extensible Style Language (XSL)
Hypertext Markup Language (HTML)
Extensible Markup Language (XML)
All choices are correct

6. A _______ document is created by a Web server whenever a browser requests the document

static
dynamic
active
None of the choices are correct

7. For many applications, we need a program or a script to be run at the client site. These are called _______________ documents

static
dynamic
active
None of the choices are correct

8. HTTP uses the services of _________

9. In HTTP, the first line in a request message is called a _ line; the first line in the response message is called the __ line

request; response
status; response
status; status
None of the choices are correct

10. In a ___________ connection, one TCP connection is made for each request/response.

persistent
nonpersistent
persistent or a nonpersistent
None of the choices are correct

11. In a ___________ connection, the server leaves the connection open for more requests after sending a response.

persistent
nonpersistent
persistent or nonpersistent
None of the choices are correct

12. In HTTP, _______ server is a computer that keeps copies of responses to recent requests.

a regular
a proxy
an auxiliary
a remote

13. An HTTP request message always contains _______.

a header line and a body
a request line and a header line
a request line, a header line, and a body
a request line, a header line, a blank line, and a body

14. Which of the following is present in both an HTTP request line and a status line?

version number
URL
status code
method

15. FTP uses the services of ________.

UDP
IP
TCP
none of the choices are correct

16. In FTP, _________ well-known port(s) is (are) used.

one
two
three
four

17. During an FTP session the control connection is opened _______.

once
twice
many times
none of the choices are correct

18. During an FTP session the data connection may be opened _______.

only once
only two times
as many times as needed
none of the choices are correct

19. In FTP, a file can be organized into records, pages, or a stream of bytes. These are types of an attribute called _______.

file types
data structures
transmission modes
none of the choices are correct

20. In FTP, there are three types of _______: stream, block, and compressed.

file types
data types
transmission modes
none of the choices are correct

21. In FTP, ASCII, EBCDIC, and image define an attribute called _______.

file type
data structure
transmission mode
none of the choices are correct

22. In FTP, when we _______, it is copied from the client to the server.

retrieve a file
store a file
open a file
none of the choices are correct

23. In the common scenario, the electronic mail system needs _________________________.

two UAs, two MTAs and one MAA
two UAs, two MTAs and two MAAs
two UAs, two pairs of MTAs and a pair of MAAs
two UAs, two pairs of MTAs and a two pairs of MAAs

24. ________ provides service to the user to make the process of sending or receiving a message easier.

An MTA
An MAA
A UA
None of the choices are correct

25. An e-mail message contains the and the __.

header; envelop
header; body
envelop; body
None of the choices are correct

26. In the Internet, an e-mail address consists of two parts: a _ and a _.

local part; domain name
global part; domain name
label; domain name
local part; label

27. ._________ is a supplementary protocol that allows non-ASCII data to be sent through e-mail.

SMPT
MPEG
MIME
POP

28. The formal protocol that defines the MTA client and server in the Internet is called ___________.

SMTP
SNMP
TELNET
SSH

29. SMTP is a __________ protocol.

pull
push
push and pull
None of the choices are correct

30. The message access protocol is a ________ protocol.

pull
push
push and pull
None of the choices are correct

31. In the _______ encoding scheme, each 24 bits become four 6-bit chunks, and eventually are sent as 32 bits

8bit
binary
base64
quoted-printable

32. In the _______ encoding scheme, a non-ASCII character is sent as 3 characters.

8bit
base64
quoted-printable
binary

33. TELNET is an abbreviation for ____________.

terminal network
telephone network
telecommunication network
None of the choices are correct

34. When a user logs into a local time-sharing system, it is called ________ login.

local
remote
local or remote
None of the choices are correct

35. When a user wants to access an application program or utility located on a remote machine, he or she performs ___________ login.

local
remote
local or remote
None of the choices are correct

36. Network Virtual Terminal (NVT) uses two sets of characters, one for _ and one for ______.

sending; receiving
request; reply
data; control
None of the choices are correct

37. For data, NVT uses US ASCII characters with the highest order bit set to ______.

1
0
1 or 0
None of the choices are correct

38. For control, NVT uses US ASCII characters with the highest order bit set to ______.

1
0
1 or 0
None of the choices are correct

39. The _______ translates local characters into NVT characters.

terminal driver
TELNET client
TELNET server
pseudoterminal driver

40. The _______ translates NVT characters into a form acceptable by the remote operating system.

terminal driver
TELNET client
TELNET server
pseudoterminal driver

41. The _________ component in the SSH provides confidentiality, integrity, authentication and compression.

SSH Application
SSH-AUTH
SSH-CONN
SSH-TRAN

42. Port forwarding is ____________________________.

a protocol used to forward messages from one port to another port
a procedure for changing an ephemeral port to a well-known port
a service, provided by SSH, that creates a secure channel for applications that do not have security services.
None of the choices are correct

43. In a _______ name space, a name is a sequence of characters without structure.

linear
flat
hierarchical
organized

44. In a _________ name space, each name is made of several parts.

linear
flat
hierarchical
organized

45. In the DNS, the names are defined in ___________ structure.

a linear list
an inverted-tree
a three-dimensional
None of the choices are correct

46. The root of the DNS tree is _______.

a string of 127 characters
a string of 63 characters
a string of 15 characters
an empty string

47. In the domain name space, a full domain name is a sequence of labels separated by ________.

colons
semicolons
dots
commas

48. In the domain name space, if a label is terminated by a null string, it is called a __________.

PQDN
CQDN
SQDN
None of the choices are correct

49. In the domain name space, if a label is not terminated by a null string, it is called a __________.

FQDN
PQDN
SQDN
None of the choices are correct

50. In the domain name space, a _________ is a subtree of the domain name space.

label
name
domain
None of the choices are correct

51. In the domain name space, what a server is responsible for or has authority over is called a _________.

domain
label
zone
None of the choices are correct

52. A _______ server is a computer whose zone system consists of the whole tree.

domain
zone
root
primary

53. A ________ server is a computer that stores a file about the zone for which it has an authority.

primary
secondary
zone
root

54. A ________ server is a computer that transfers the complete information about a zone from another server.

primary
secondary
zone
root

55. In the Internet, the country domain section uses ___________ country abbreviations.

two-character
three-character
four-character
None of the choices are correct

56. In __________ resolution, the resolver expects the server to supply the final answer.

iterative
recursive
straight
None of the choices are correct

57. In __________ resolution, the server returns the IP address of the server that it thinks can resolve the query.

iterative
recursive
straight
None of the choices are correct

58. DNS can use the services of ________.

UDP
TCP
either UDP or TCP
None of the choices are correct

59. A registrar, a commercial entity accredited by ________ is responsible for adding new domains to DNS data base

NIC
ICANN
ISOC
IEFE

60. In a centralized P2P network, the directory system uses the paradigm; the storing and downloading of the files are done using __ paradigm.

client-server; client-server
peer-to-peer; client-server
client-server; peer-to-peer
peer-to-peer; peer-to-peer

61. Napster is an example of a ____________ peer-to-peer network

centralized
structured-decentralized
unstructured-decentralized
None of the choices are correct

62. Gnutella is an example of a ____________ peer-to-peer network

centralized
structured-decentralized
unstructured-decentralized
None of the choices are correct

63. BitTorrent is an example of a ____________ peer-to-peer network

centralized
structured-decentralized
unstructured-decentralized
None of the choices are correct

64. In a structured-decentralized P2P network, ________________.

the directory system is kept in a center
a query to find a file must be flooded through the network
a pre-defined set of rules is used to link nodes so that a query can be effectively and efficiently resolved
None of the choices are correct

65. In a DHT-based network, each peer

has a partial knowledge about the whole network.
has a complete knowledge about the whole network.
only has a knowledge about its successor.
None of the choices are correct

66. The finger table is the routing table used in ______________.

Gnutella
Pastry
Kademlia
None of the choices are correct

67. Which of the following is not a Chord interface.

Lookup
Fix node
Stabilize
Join

68. In __________ a key is stored in a node whose identifier is numerically closest to the key.

Chord
Pastry
Kademlia
None of the choices are correct

69. To resolve a query, _________ uses two entities: a routing table and a leaf set.

Chord
Pastry
Kademlia
None of the choices are correct

70. In Kademlia, the distance between the two identifiers (nodes or keys) are measured as the bitwise-___________ between them.

AND
NOR
OR
None of the choices are correct

71. In ________, nodes and data items are m-bit identifiers that create an identifier space of 2m points distributed at the leaves of a binary tree

Chord
Pastry
Kademlia
None of the choices are correct

72. In Kademlia, each node in the network divides the binary tree into m subtrees that.

include the node itself
do not include the node itself
include the node itself and the successor node
None of the choices are correct

73. Trackerless BitTorrent uses __________ DHT to do the job of tracking.

Chord
Pastry
Kademlia
None of the choices are correct

Computer Networking – Application Layer MCQs

1. In a client-server paradigm, a _______ program provides services to a (another) _______ program