Module 12 Quizlet
Hostnames
A DNS server contains a table that associates _________ in a domain with corresponding IP addresses.
Public Switched Telephone Network (PSTN)
A call to a regular telephone (landline or cell phone) requires using a gateway to access the. . .
143
A new employee is attempting to configure a cell phone to connect to the email server of the company. Which port number should be selected when using the IMAP4 protocol to access email messages stored on the local server?
110
A new employee is attempting to configure a cell phone to connect to the email server of the company. Which port number should be selected when using the POP3 protocol to access messages stored on the email server?
25
A new employee is configuring a cell phone for company email. Once configured, what is the destination port number used when the employee sends an email from the phone?
Internet Message Access Protocol (IMAP4)
A server that supports IMAP clients also receives and stores messages addressed to its users. However, unlike POP, IMAP keeps the messages in the mailboxes on the server, unless they are deleted by the user. The most current version of IMAP is this protocol which listens for client requests on port 143.
Post Office Protocol (POP3)
A server that supports POP clients receives, and stores messages addressed to its users. When the client connects to the email server, the messages are downloaded to the client. By default, messages are not kept on the server after they have been accessed by the client. Clients contact this protocol's servers on port 110.
Start and stop processes, configure the device, and even shut down the system.
After a Telnet connection is established, users can perform any authorized function on the server, just as if they were using a command line session on the server itself. If authorized, they can. . .
Drags files between the local host window and the remote site (FTP server) window to transfer files.
After logging into the FTP server with a username and password, the user. . .
Telnet
After networks became available, people needed a way to remotely access the computer systems in the same manner that they did with the Directly Attached Terminals. This was developed to meet that need.
Easily intercepted and understood.
All data exchanged during Telnet sessions is transported as plaintext across the network. This means that the data can be. . .
Support transporting encrypted data.
Although the Telnet protocol can require a user to login, it does not. . .
23
An employee of a company is attempting to remotely access a computer system using a virtual terminal (vty) session via Telnet. Which destination port number should the employee put in the remote access software being used?
Virtual terminal (vty) session, or connection.
Appropriately enough, a connection using Telnet is called a _______ ________ ______ ___ __________. Rather than using a physical device to connect to the server, Telnet uses software to create a virtual device that provides the same features of a terminal session with access to the server's command line interface (CLI).
Selecting the username from a list.
Calls are made to other users of the same service on the internet, by . . .
.com, .edu, and .net
DNS names are registered and organized on the internet within specific high-level groups, or domains. Some of the most common high-level domains on the internet are. . .
Microsoft 365, Yahoo, and Gmail.
Email is one of the most popular client/server applications on the internet. Email servers run server software that enables them to interact with clients and with other email servers over the network.
The request will time out and the client will not be able to communicate with the web server.
If the DNS server cannot determine the IP address, . . .
Transfer Files.
In addition to web services, another common service used across the internet is one that allows users to. . .
Associating a name with an IP address.
It would be impossible to remember all of the IP addresses for all of the servers' hosting services on the internet. Instead, there is an easier way to locate servers by. . .
Text Based Systems
Long before desktop computers with sophisticated graphical interfaces existed, people used __________ _______ which were often just display terminals physically attached to a central computer.
Peer-to-Peer
Making telephone calls over the internet is becoming increasingly popular. An internet telephony client uses ____________ technology similar to that used by instant messaging, as shown in the figure. IP telephony makes use of Voice over IP (VoIP) technology, which converts analog voice signals into digital data. The voice data is encapsulated into IP packets which carry the phone call through the network.
Command-Line Interface
Most client operating systems such as Windows, Mac OS, and Linux include a ____________ _________ for FTP. There is also GUI-based FTP client software that provides a simple drag-and-drop interface for FTP.
Domain Name System
Resolves internet names to IP addresses.
Simple Mail Transfer Protocol (SMTP)
Sends email messages and attachments from clients to servers and from servers to other email servers.
Text-Based Terminal Devices
Telnet provides a standard method of emulating __________ ________ _______ over the data network. Both the protocol itself and the client software that implements the protocol are commonly referred to as Telnet. Telnet servers listen for client requests on TCP port 23.
Other users of the same site.
Text messages may also be called instant messages, direct messages, private messages, and chat messages. Text messaging enables users to communicate or chat over the internet in real-time. Text messaging services on a computer are usually accessed through a web-based client that is integrated into a social media or information sharing site. These clients usually only connect to . . .
Two different ports
The FTP server enables a client to exchange files between devices. It also enables clients to manage files remotely by sending file management commands such as delete or rename. To accomplish this, the FTP service uses what to communicate between client and server?
443
The HTTP protocol is not a secure protocol; information could easily be intercepted by other users as data is sent over the network. In order to provide security for the data, HTTP can be used with secure transport protocols. Requests for secure HTTP are sent to port _____. These requests use https in the site address in the browser, rather than http.
Cisco Webex Teams, Microsoft Teams, WhatsApp, Facebook Messenger,
There are also a number of standalone text message clients such as _________________________________________________________________________________ and many others. These applications are available for a wide variety of operating systems and devices. A mobile version is typically offered. In addition to text messages, these clients support the transfer of documents, video, music, and audio files.
HTTP & HTML
There are many different web servers and web clients available on the market. The _______ protocol and _______ standards make it possible for these servers and clients from many different manufacturers to work together seamlessly.
Simple Mail Transfer Protocol
This is used by an email client to send messages to its local email server. The local server then decides if the message is destined for a local mailbox or if the message is addressed to a mailbox on another server. If the server has to send the message to a different server, SMTP is used between those two servers as well. SMTP requests are sent to port 25.
The Secure Shell (SSH) protocol
This protocol offers an alternate and secure method for server access. This protocol provides the structure for secure remote login and other secure network services. It also provides stronger authentication than Telnet and supports transporting session data using encryption. As a best practice, network professionals should always use SSH in place of Telnet, whenever possible.
The File Transfer Protocol (FTP)
This protocol provides an easy method to transfer files from one computer to another. A host running FTP client software can access this protocol server to perform various file management functions including file uploads and downloads.
Domain Name System (DNS)
This provides a way for hosts to use this name to request the IP address of a specific server, as shown in the figure.
Text messaging
This, shown in the figure, is one of the most popular communication tools in use today. In addition, this software is built into many online applications, smart phone apps, and social media sites.
IP Address
Thousands of servers, installed in many different locations, provide the services that we use daily over the internet. Each of these servers is assigned a unique __ ______ that identifies it on the local network where it is connected.
False
True or False? Text messaging is only available on a smartphone?
Internet Message Access Protocol (IMAP)
Used by email clients to retrieve email and attachments from a remote server.
Post Office Protocol (POP)
Used by email clients to retrieve email and attachments from a remote server.
Hypertext Transfer Protocol (HTTP)
Used by web browsers to request web pages and web servers to transfers the files that make up web pages of the World Wide Web.
File Transfer Protocol (FTP)
Used for interactive file transfer between systems.
Dynamic Host Configuration Protocol (DHCP)
Used to automatically configure devices with IP addressing and other necessary information to enable them to communicate over the internet.
Secure Shell (SSH)
Used to provide remote access to servers and networking devices.
Internet searches, social media sites, video and audio streaming, on-line shopping sites, email and messaging.
What are the most common internet services that you use on a regular basis?
It downloads a copy of email messages leaving the original on the server.
What is a feature of IMAP?
SSH provides secure communications to access hosts.
What is the advantage of using SSH over Telnet?
SMTP
What protocol is used by a client to send email to a mail server.
HTTP
What protocol is used by web servers to serve up a web page?
The 1st connection established is for traffic control & the 2nd connection is created to transfer a file. And files can be downloaded from or uploaded to the server.
What two characteristics describe an FTP connection?
43
When a client has the name of server, such as a web server, but needs to find the IP address, it sends a request to the DNS server on port ___. The client uses the IP address of the DNS server configured in the DNS settings of the host IP configuration.
80
When a web client receives the IP address of a web server, the client browser uses that IP address and port ___ to request web services. This request is sent to the server using the Hypertext Transfer Protocol (HTTP).
IP Packets
When analog voice signals are converted for use on a computer network, in what format are they encapsulated?
That information is sent back to the client.
When the DNS server learns the IP address, . . .
It queries another DNS server within the domain.
When the DNS server receives the request, it checks its table to determine the IP address associated with that web server. If the local DNS server does not have an entry for the requested name, . . .
The user selects a unique name.
When the IP phone software has been installed, . . . This is so that calls can be received from other users.
The server responds to the client request and sends the web page to the client.
When the server receives a port 80 request, ____________________________________________________________________________________________________. The information content of a web page is encoded using specialized 'mark-up' languages. The Hypertext Markup Language (HTML) coding tells the browser how to format the web page and what graphics and fonts to use. HTML is the most commonly used language.
DHCP
Which application protocol is used to automatically configure IP addressing information?
DNS (Domain Name System)
Which application protocol is used to resolve web addresses to an IP address?
POP & IMAP
Which application protocols are used to by clients to retrieve email messages?
Instant Messaging
Which communication tool allows multiple users to communicate with each other in real time by using a smartphone application or social media site?
HTTP (Hypertext Transfer Protocol)
Which protocol is used to transfer web pages from a server to a client device?
POP3
Which protocol removes messages from the server after they have been accessed by a client?
IMAP4
Which protocol retains a message in a mailbox on a server, even after the message is accessed by a user on a local client device?
______ is one of the most popular client/server applications on the internet. ______ servers run server software that enables them to interact with clients and with other ______ servers over the network.
DNS
efer to the exhibit. Which protocol allows a user to type www.cisco.com instead of an IP address to access the web server?
