Module 16 - Application layer services

Question 1

Which type of software runs on a host to provide services like web, email, or file sharing to clients on a network?

Answer 1

Server software

Question 2

Which application would you use as a client to access a web page from a server?

Answer 2

A web browser

Question 2

Which server type stores corporate or user files for client access using tools like Windows File Explorer?

Answer 2

A file server

Question 3

Which process must occur before a client can communicate using a domain name like www.learnip.com?

Answer 3

A DNS lookup

Question 4

Which two protocols operate at the Transport Layer to manage port-based communication?

Answer 4

TCP and UDP

Question 4

Which term refers to the full set of IP and port info used to identify a single communication between two devices?

Answer 4

A socket

Question 4

Which port does a web server listen on for HTTP requests according to the lesson?

Answer 4

TCP port 80

Question 5

Which combination of values defines a socket for a TCP connection?

Answer 5

Source IP and port number, destination IP and port number

Question 6

Which transport layer protocol would be used for real-time or streaming communications due to its low overhead?

Answer 6

UDP

Question 6

Which type of identifier refers broadly to any resource on a network using a string format?

Answer 6

A URI (Uniform Resource Identifier)

Question 7

Which URI specialization defines only the namespace of a resource without specifying protocol?

Answer 7

URN (Uniform resource name)

Question 8

Which URI specialization defines the location of a resource and includes the protocol?

Answer 8

URL (Uniform Resource Locator)

Question 9

Which part of a URI includes items like /author/book.html?

Answer 9

Path and file name

Question 10

Which part of a URI might include items like #page155?

Answer 10

The fragment

Question 10

Which protocol is used to resolve internet names to IP addresses?

Answer 10

DNS

Question 11

Which protocol allows email clients to retrieve and manage emails directly on the remote server without deleting them?

Answer 11

IMAP

Question 11

Which protocol provides remote access to servers and network devices using encrypted communication?

Answer 11

SSH

Question 12

Which protocol allows email clients to retrieve email and attachments by downloading them from a remote server, typically deleting them from the server after retrieval?

Answer 12

POP

Question 12

Which protocol is responsible for sending email messages and attachments from clients to servers or between servers?

Answer 12

SMTP

Question 13

Which protocol enables the transfer of files interactively between systems over a network?

Answer 13

FTP

Question 14

Which protocol is used to automatically assign IP addresses and configuration information to devices on a network?

Answer 14

DHCP

Question 14

Which protocol do web browsers use to request web pages from web servers?

Answer 14

HTTP

Question 15

Which process occurs when a client sends a request to resolve a domain name to an IP address?

Answer 15

DNS lookup

Question 16

Which language tells a browser how to display and format a web page?

Answer 16

HTML (Hypertext markup language)

Question 16

Which two TCP ports are used by FTP to manage communication between client and server?

Answer 16

TCP port 21 for control and TCP port 20 transfer

Question 17

Which TCP port does an FTP client use to initiate the control connection to an FTP server?

Answer 17

TCP port 21

Question 18

Which TCP port is used by the FTP server to transfer actual data files after the session is established?

Answer 18

TCP port 20

Question 19

Which software allows users to access a server remotely using either Telnet or SSH protocols?

Answer 19

Tera Term

Question 19

Which protocol provides a more secure alternative to Telnet for remote server access?

Answer 19

SSH

Question 19

Which TCP port does a Telnet server use to listen for client requests?

Answer 19

TCP port 23

Question 20

Which type of session is created when a Telnet client connects to a server?

Answer 20

A vty (virtual terminal session)

Question 20

Which command line access method emulates a text-based terminal connection over a network using unencrypted data?

Answer 20

Telnet

Question 21

Which command line access method supports encryption and stronger authentication mechanisms for secure sessions?

Answer 21

SSH

Question 22

Which TCP port is used by SMTP to transmit email messages?

Answer 22

TCP port 25

Question 23

Which application protocol is used to retrieve email messages and delete them from the server after access by the client?

Answer 23

POP3

Question 23

Which TCP port does a POP3 server listen on for client connections?

Answer 23

TCP port 110

Question 23

Which application protocol allows clients to retrieve email without deleting it from the mail server by default?

Answer 23

IMAP4

Question 24

Which port is used by IMAP4 to listen for client requests?

Answer 24

TCP port 143

Question 25

Which type of technology does internet telephony use to convert analog voice into digital packets?

Answer 25

VoIP (Voice over IP)

Question 25

Which network type is used when a VoIP call must reach a standard landline or cell phone?

Answer 25

PSTN (Public Switched Telephone Network)