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Question 1 of 60 Quiz ID: q1

Which of the following best describes file storage in network applications?

Files are stored locally on each client machine

Files are stored on a server in the network and accessed by clients

Files are stored in the cloud and accessed through web browsers only

Files are distributed across multiple peer nodes

Question 2 of 60 Quiz ID: q2

What year was the File Transfer Protocol (FTP) originally defined?

1970

1980

1985

1990

Question 3 of 60 Quiz ID: q3

Which transport protocol does FTP use?

UDP

TCP

SCTP

HTTP

Question 4 of 60 Quiz ID: q4

How many connections does FTP use and what are they?

One connection on port 21

Two connections: Control on port 21 and Data on port 20

Three connections: Control, Data, and Authentication

One connection that switches between control and data modes

Question 5 of 60 Quiz ID: q5

What form of authentication does FTP provide?

Certificate-based authentication

Token-based authentication

Username and password

Biometric authentication

Question 6 of 60 Quiz ID: q6

Which FTP command is used to retrieve a file from the server?

GET

RETR

Both GET and RETR

DOWNLOAD

Question 7 of 60 Quiz ID: q7

What does the FTP command 'STOR' do?

Store file information

Upload a file to remote host

Create storage directory

Store user credentials

Question 8 of 60 Quiz ID: q8

What does SFTP stand for and what is its main advantage over FTP?

Simple FTP; easier to use

Secure File Transfer Protocol; transfers files over TLS

Super Fast Transfer Protocol; faster transfers

Standard File Transfer Protocol; industry standard

Question 9 of 60 Quiz ID: q9

What is another name for Network File Systems?

Distributed File Systems

Network Attached Storage (NAS)

Storage Area Networks

Cloud Storage Systems

Question 10 of 60 Quiz ID: q10

Which file system is commonly used in Unix environments?

SMB

CIFS

Network File System (NFS)

WebDAV

Question 11 of 60 Quiz ID: q11

Which file systems are commonly used in Windows environments?

NFS and AFS

SMB and CIFS

WebDAV and FTP

SSH and Telnet

Question 12 of 60 Quiz ID: q12

How does a client typically access a network file system?

Through a web browser only

By mounting the file system as a drive

Using command line tools exclusively

Through email attachments

Question 13 of 60 Quiz ID: q13

What characterizes Storage-Area Networks (SANs)?

File-level access for clients

Block-level access for high performance storage shared among servers

Web-based storage interfaces

Peer-to-peer file sharing

Question 14 of 60 Quiz ID: q14

What is a key issue with Internet storage compared to LAN storage?

Higher cost

Limited storage capacity

Internet is slower and less reliable than LAN

Incompatible file formats

Question 15 of 60 Quiz ID: q15

Which protocol is mentioned as being used for Internet storage?

FTP

HTTP

WebDAV

SMTP

Question 16 of 60 Quiz ID: q16

Why was the Domain Name System (DNS) created?

To replace IP addresses entirely

To overcome the limitations of the hosts file as networks grew

To provide email routing

To enable web browsing

Question 17 of 60 Quiz ID: q17

In which RFCs is DNS defined?

RFCs 1034 and 1035

RFCs 959 and 960

RFCs 2821 and 2822

RFCs 793 and 794

Question 18 of 60 Quiz ID: q18

On which port does DNS operate?

Port 21

Port 25

Port 53

Port 80

Question 19 of 60 Quiz ID: q19

What type of naming scheme does DNS use?

Flat naming scheme

Hierarchical, domain-based naming scheme

Sequential numbering system

Random hash-based naming

Question 20 of 60 Quiz ID: q20

Which of the following is NOT a DNS function mentioned in the lecture?

Translating names to IP addresses

Translating names to other information

Translating IP addresses to names

Providing file storage services

Question 21 of 60 Quiz ID: q21

What is an example of DNS translating a name to an IP address?

123.56.88.126 => abc.lk

abc.lk => 123.56.88.126

foolish.lk => the society of foolish people

202.33.192.85 => host85.mycomp.org

Question 22 of 60 Quiz ID: q22

What do authoritative DNS servers provide?

Caching services for faster lookups

Authoritative hostname to IP mappings for organization's servers

Load balancing for web servers

Backup storage for DNS records

Question 23 of 60 Quiz ID: q23

What is another name for a Local Name Server?

Root name server

Authoritative name server

Default name server

Primary name server

Question 24 of 60 Quiz ID: q24

What role does a local name server play in DNS queries?

It stores all DNS records globally

It acts as a proxy and forwards queries into the hierarchy

It only handles reverse DNS lookups

It manages domain registrations

Question 25 of 60 Quiz ID: q25

What is a key advantage of using local name servers?

They provide better security

They reduce lookup latency for commonly searched hostnames

They cost less to maintain

They have unlimited storage capacity

Question 26 of 60 Quiz ID: q26

How do Peer-to-Peer (P2P) applications differ from the client-server model?

P2P applications are always faster

P2P has no specified client or server, with all peers having equal status

P2P applications only work on mobile devices

P2P requires a central database

Question 27 of 60 Quiz ID: q27

Which of the following is NOT mentioned as a P2P application?

File Sharing

Instant Messaging

Online Gaming

Web Browsing

Question 28 of 60 Quiz ID: q28

In the P2P file sharing example, what protocol is used for file transfer?

FTP

SFTP

HTTP

TCP

Question 29 of 60 Quiz ID: q29

What makes P2P file sharing highly scalable?

Centralized servers handle all requests

All peers are servers, so capacity grows with users

Files are compressed before sharing

Only selected peers serve files

Question 30 of 60 Quiz ID: q30

In the original Napster design, what information does a peer provide to the central server when connecting?

Username and password only

IP address and content

File sizes and checksums

Download and upload speeds

Question 31 of 60 Quiz ID: q31

What are the main problems with centralized directory P2P systems like original Napster?

Slow file transfers and limited storage

Single point of failure, performance bottleneck, and copyright infringement issues

High bandwidth costs and complex setup

Incompatible file formats and security vulnerabilities

Question 32 of 60 Quiz ID: q32

How does decentralized file sharing (like BitTorrent) differ from centralized systems?

It uses faster protocols

It has no central directory; each file has controller nodes with info about sharing nodes

It only works with specific file types

It requires special hardware

Question 33 of 60 Quiz ID: q33

What is BitTorrent primarily designed for?

Searching for files across the internet

Efficient content distribution using file swarming

Real-time communication between peers

Secure file encryption and storage

Question 34 of 60 Quiz ID: q34

What does a .torrent file contain?

The actual file content to be shared

Metadata about files and information about the tracker

User credentials and permissions

Network routing information

Question 35 of 60 Quiz ID: q35

What is the role of the tracker in BitTorrent?

To store the actual files being shared

To coordinate file distribution by telling peers where to download pieces

To provide search functionality for files

To encrypt files during transfer

Question 36 of 60 Quiz ID: q36

What is the typical size range for pieces in BitTorrent file sharing?

1 KB to 64 KB

64 KB to 1 MB

1 MB to 10 MB

10 MB to 100 MB

Question 37 of 60 Quiz ID: q37

What information does a tracker maintain about peers?

File content and checksums

IP address, port, peer ID, and state information

User preferences and download history

Network bandwidth and connection speed

Question 38 of 60 Quiz ID: q38

What is a 'seeder' in BitTorrent terminology?

A peer that is just starting to download

A peer that provides the complete file

A peer that only downloads but never uploads

A peer that manages the tracker

Question 39 of 60 Quiz ID: q39

What is an 'initial seeder'?

The first peer to join a torrent

A peer that provides the initial copy of the file

A peer with the fastest internet connection

A peer designated by the tracker

Question 40 of 60 Quiz ID: q40

What is a 'leecher' in BitTorrent?

A malicious peer that only downloads

One who is downloading (not a derogatory term)

A peer with slow internet connection

A peer that corrupts file pieces

Question 41 of 60 Quiz ID: q41

When can a leecher start sharing pieces with other downloaders?

Only after downloading the complete file

As soon as it has a complete piece

After downloading 50% of the file

Only with permission from the initial seeder

Question 42 of 60 Quiz ID: q42

How does a leecher become a seeder?

By uploading more than downloading

By obtaining all the pieces and assembling the complete file

By being designated by the tracker

By maintaining the highest upload speed

Question 43 of 60 Quiz ID: q43

What does the initial seeder do with the file before sharing?

Compresses it for faster transfer

Encrypts it for security

Chops it into many pieces

Creates multiple copies

Question 44 of 60 Quiz ID: q44

How does a leecher initially locate other peers sharing a file?

Through direct peer discovery

By broadcasting on the local network

By locating the .torrent file that directs it to a tracker

Through social media networks

Question 45 of 60 Quiz ID: q45

What happens as more downloads occur in BitTorrent?

The network becomes slower

More replicas of pieces become available

The original file gets corrupted

The tracker becomes overloaded

Question 46 of 60 Quiz ID: q46

How does BitTorrent verify file integrity?

Through digital signatures

By verifying checksums

Through peer voting

Using encryption keys

Question 47 of 60 Quiz ID: q47

Which field is NOT typically included in a .torrent file?

URL of the tracker

Piece hashes

User credentials

Piece length

Question 48 of 60 Quiz ID: q48

What does the tracker return to peers requesting information?

File content and metadata

A random list of peers

Search results for files

Network performance statistics

Question 49 of 60 Quiz ID: q49

What is the main advantage of file swarming in BitTorrent?

Better file compression

Enhanced security features

Distributed load and increased download speed through multiple sources

Reduced storage requirements

Question 50 of 60 Quiz ID: q50

In network file storage, what is the primary difference between file-level and block-level access?

File-level is faster than block-level

Block-level provides direct access to storage blocks while file-level accesses complete files

File-level requires special hardware

Block-level is only used in peer-to-peer systems

Question 51 of 60 Quiz ID: q51

What is the primary purpose of the LIST command in FTP?

To list available FTP servers

To list the files in the current remote directory

To list connected users

To list transfer protocols

Question 52 of 60 Quiz ID: q52

Which DNS function involves translating '202.33.192.85' to 'host85.mycomp.org'?

Forward DNS lookup

Reverse DNS lookup

DNS caching

DNS forwarding

Question 53 of 60 Quiz ID: q53

In the DNS hierarchy, what type of servers are at the top level?

Local DNS servers

Authoritative DNS servers

Root DNS servers

Caching DNS servers

Question 54 of 60 Quiz ID: q54

What makes P2P file sharing different from traditional client-server file sharing?

P2P uses different file formats

In P2P, each peer can act as both client and server

P2P is always encrypted

P2P only works with small files

Question 55 of 60 Quiz ID: q55

What is the main limitation of using /etc/hosts file for hostname resolution?

It only works with IP version 4

It requires root privileges to modify

It becomes difficult to update in every host as the network grows

It doesn't support long hostnames

Question 56 of 60 Quiz ID: q56

Which of the following best describes WebDAV?

A peer-to-peer file sharing protocol

A protocol used for Internet storage

A DNS lookup method

A network file system for Unix

Question 57 of 60 Quiz ID: q57

In BitTorrent, what is the significance of piece hashes in the .torrent file?

They determine download priority

They enable verification of piece integrity

They specify file compression methods

They identify peer locations

Question 58 of 60 Quiz ID: q58

What happens when Alice downloads from Bob while others upload from Alice in P2P?

The network becomes congested

File transfer speeds decrease

It demonstrates the scalable nature of P2P systems

It violates P2P protocols

Question 59 of 60 Quiz ID: q59

What is a key characteristic of distributed services mentioned in P2P applications?

They require central coordination

They operate without a single point of control

They only work in local networks

They are slower than centralized services

Question 60 of 60 Quiz ID: q60

According to the lecture, which statement best summarizes the evolution from FTP to modern file storage?

Modern systems only use web browsers for access

Security improvements led to protocols like SFTP, while integration with GUIs improved usability

File sizes have become the limiting factor

All modern systems use peer-to-peer architecture

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