Which protocol removes messages from the server after they have been accessed by a client?

IMAP and POP3 are protocols for accessing emails stored on a mail server. You can configure your email software to access emails from your IONOS email account using either IMAP or POP3. We recommend IMAP. In this article you will learn why.

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Which protocol remove messages from the server after they have been accessed by a client?
What protocol removes mail from server?
Which protocol removes messages from the server after they have been accessed by a client SMTP POP3 DNS imap4?
What is POP3 used for?

IMAP (Internet Message Access Protocol)

Emails remain on the email server, allowing you to set up the account on multiple computers and devices to access your email, as well accessing them through Webmail.
Folders can be created on the server to better manage the messages. The folders then sync across all devices used to check your email.
Sent messages are also saved in the sent folder, allowing you to view sent emails from any computer or device.
The server saves the status of an email (e.g. read, unread, replied, etc.). This allows you to see the status from any computer or device.
Initially, only the header (sender, date, subject) of an email is loaded. You can then decide whether you want to download the complete email message.
Messages are deleted directly on the server without being downloaded first.
You won't lose your emails if your mobile device or PC is destroyed or stolen.

POP3 (Post Office Protocol version 3)

All your emails are downloaded to the computer or device checking the email. After the emails have been downloaded, they are removed from the mail server.
Once the emails have been downloaded to the computer or device, you can also access your emails even if the device has no internet connection.
Data such as emails and folders are not synchronized between different devices. This means that if you set up your email on your mobile device with POP3, the emails will be downloaded completely to your mobile device. POP3 removes the emails from the mail server. It will no longer be possible for you to read your emails in Webmail because they are already downloaded to your mobile device.

Please note: It is possible, but not recommended, to use set up the same email account using IMAP and POP3 on different devices. If you choose to do this, it's highly recommended to Leave a copy of all messages on the server for the device using POP3. This allows you to still access and manage emails using IMAP on other devices.

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Terms in this set (44)

255.255.255.255

Which destination IPv4 address does a DHCPv4 client use to send the initial DHCP Discover packet when the client is looking for a DHCP server?

Dynamic Allocation

Which is a DHCPv4 address allocation method that assigns IPv4 addresses for a limited lease period?

broadcast DHCPREQUEST

Which DHCPv4 message will a client send to accept an IPv4 address that is offered by a DHCP server?

Printers and servers

Which 2 types of devices are typically assigned static IP addresses?

DHCPDISCOVER AND DHCPREQUEST

A DHCP-enabled client PC has just booted. During which two steps will the client PC use broadcast messages when communicating with a DHCP server? (Choose two.)

Eliminates burden on network support staff and eliminates most address configuration errors

Which two reasons generally make DHCP the preferred method of assigning IP addresses to hosts on large networks? (Choose two.)

Discover
Offer
Request
Acknowledge

If more than one DHCP server is available on the local network, in which order will DHCP messages be sent between a host and a DHCP server?

251 - If the block of addresses allocated to the pool is 192.168.10.0/24, there are 254 IP addresses to be assigned to hosts on the network. As there are 3 printers which need to have their addresses assigned statically, then there are 251 IP addresses left for assignment.

A DHCP server is used to assign IP addresses dynamically to the hosts on a network. The address pool is configured with 192.168.10.0/24. There are 3 printers on this network that need to use reserved static IP addresses from the pool. How many IP addresses in the pool are left to be assigned to other hosts

When a device that is configured to use DHCP boots, the client broadcasts a DHCPDISCOVER message to identify any available DHCP servers on the network

The client broadcasts a DHCPDISCOVER message to identify any available DHCP servers on the network. A DHCP server replies with a DHCPOFFER message. This message offers to the client a lease that contains such information as the IP address and subnet mask to be assigned, the IP address of the DNS server, and the IP address of the default gateway. After the client receives the lease, the received information must be renewed through another DHCPREQUEST message prior to the lease expiration.

Which statement is true about DHCP operation?

IPv4 addresses are 32 bits
IPV6 addresses use hexadecimal numbers

Which two statements are correct about IPv4 and IPv6 addresses? (Choose two.)

dual stack

Which network technology allows devices to communicate using both IPv4 and IPv6 addressing at the same time?

More addresses for networks and hosts

An IPv6 address is comprised of 128 bits as opposed to 32 bits in an IPv4 address. Thus it offers far more addresses for networks and hosts than an IPv4 address does.

What is an advantage of using IPv6 ?

The LOGICAL address of the ROUTER interface on the same network as the host computer

The default gateway is the IP address of an interface on the router on the same network as the sending host.

Which characteristic describes the default gateway of a host computer?

2001:0db8:3c55:0015:1010:0000:abcd:ff13

An IPv6 address is made up of 128 bits represented in hexadecimal numbers. There are two rules that help reduce the number of digits needed to represent an IPv6 address.
Rule 1 - Omit leading zeros in any 16-bit section.
Rule 2 - Replace any single group of consecutive zeros with a double colon (::). This can only be used **once** within an IPv6 address.

Which number grouping is a valid IPv6 address?

SLAAC

Stateless Address Autoconfiguration (SLAAC) relies on information received in router advertisement (RA) messages in order to automatically create an IPv6 address. The RA messages contain information such as the network prefix and prefix length, which the host combines with an interface ID in order to make a unique IPv6 unicast address.

Which method of IPv6 prefix assignment relies on the prefix contained in RA messages?

2001:DB8:0:1111:200

IPv6 addresses are represented by 32 hexadecimal digits (0-9, A-F). The size of the notation can be reduced by eliminating leading zeroes in any hextet and by replacing a single, contiguous string of hextets containing all zeroes with a double colon, which can only be used one time.

Which IPv6 address notation is valid?

Router

Typically, the translation from private IP addresses to public IP addresses is performed on routers in corporate environments. In a home environment, this device might be an access point that has routing capability or the DSL or cable router.

Typically, which network device would be used to perform NAT for a corporate environment?

Link-local

Link-local IPv6 addresses start with FE80::/10, which is any address from FE80:: to FEBF::. Link-local addresses are used extensively in IPv6 and allow directly connected devices to communicate with each other on the link they share.

What type of IPv6 address is FE80::1?

Tunneling

The tunneling migration technique encapsulates an IPv6 packet inside an IPv4 packet. Encapsulation assembles a message and adds information to each layer in order to transmit the data over the network. Translation is a migration technique that allows IPv6-enabled devices to communicate with IPv4-enabled devices using a translation technique similar to NAT for IPv4. The dual-stack migration technique allows IPv4 and IPv6 protocol stacks to coexist on the same network simultaneously.

Which network migration technique encapsulates IPv6 packets inside IPv4 packets to carry them over IPv4 network infrastructures?

UDP has no overhead

UDP is a stateless protocol that provides no reliability or flow control. Because of its low overhead, UDP is well suited for delay sensitive applications such as VoIP.

Why is UDP well suited as the transport layer protocol for video applications?

Port numbers

IP addresses are added to an Internet (IP) header. The ACK flag and window components are only added to a TCP header.

Which transport layer information is added to both the TCP and UDP headers?

Applications that are sensitive to delay

UDP is not a connection-oriented protocol and does not provide retransmission, sequencing, or flow control mechanisms. It provides basic transport layer functions with a much lower overhead than TCP. Lower overhead makes UDP suitable for applications which are sensitive to delay.

What type of applications are best suited for using UDP?

Port Number

The TCP/IP transport layer uses port numbers to identify target applications. Each network application (server or client) has a port number assigned to the application.

What protocol header information is used at the transport layer to identify a target application?

443

A client device has initiated a secure HTTP request to a web browser. Which well-known port address number is associated with the destination address?

192.168.1.1:80

A socket is defined by the combination of an IP address and a port number, and uniquely identifies a particular communication.

Which number or set of numbers represents a socket?

Sequence numbers

At the transport layer, TCP uses the sequence numbers in the header of each TCP segment to reassemble the segments into the correct order.

What information is used by TCP to reassemble and reorder received segments?

Well-known port

*Well-known ports (0 to 1023) are reserved for common applications and services.
*Registered ports (1024 to 49151) are assigned to user processes and applications.
*Dynamic, private, or ephemeral ports (49152 to 65535) are assigned to client applications when initiating a connection.

What type of port number is assigned by IANA to commonly used services and applications?

TCP

Transmission Control Protocol (TCP) operates at the transport layer of the TCP/IP model. TCP ensures that IP packets are delivered reliably.

Which protocol operates at the transport layer of the TCP/IP model and ensures reliable delivery of IP packets?

It provides unreliable delivery of segments

Is a connectionless protocol

What is a characteristic of UDP?

What is the well-known port address number used by DNS to serve requests?

The client randomly selects a source port number

Because a session does not have to be established for UDP, the client selects a random source port to begin a connection. The random port number selected is inserted into the source port field of the UDP header.

Which action is performed by a client when establishing communication with a server via the use of UDP at the transport layer?

110

The POP3 protocol uses the TCP protocol with port 110 for accessing emails stored on a local server.

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?

SSH provides secure communications to access hosts

SSH provides a secure method for remote access to hosts by encrypting network traffic between the SSH client and remote hosts. Although both Telnet and SSH request authentication before a connection is established, Telnet does not support encryption of login credentials.

What is the advantage of using SSH over Telnet?

IMAP4

The IMAP4 protocol will keep any message accessed by a client device in the mailbox on the server. The message is removed from the mailbox only after it is deleted by a user on the client device.

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?

143

The IMAP4 protocol uses the TCP protocol with port 143 for accessing emails stored on a local server.

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?

HTTP

The Hypertext Transfer Protocol (HTTP) provides services between a web browser requesting web pages and a web server responding to the requests. HTML (Hypertext Markup Language) is a markup language to instruct a web browser how to interpret and display a web page.

Which protocol is used to transfer web pages from a server to a client device?

The SMTP protocol uses TCP port 25 as the destination when a client is sending an email message using a local server.

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?

DNS

Web servers are assigned static IP addresses. They are also registered with domain names so people can remember them easily. However, web servers are connected through their IP addresses. DNS provides the service to map the domain name to its IP address.

Which protocol allows a user to type www.cisco.com instead of an IP address to access the web server?

Instant messaging

Instant messaging (IM) software enables users to communicate or chat over the Internet in real time. IM requires users to log in before they can communicate. Blogs, email, and web mail are asynchronous communication tools.

Which communication tool allows multiple users to communicate with each other in real time by using a smartphone application or social media site?

A Telnet server listens on TCP port 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?

The first connection established is for traffic control-
The second is created to transfer a file

An FTP client is an application that runs on a computer used to push and pull files from a server running an FTP daemon. To transfer files, FTP requires two connections between the client and the server: one for commands and replies and another for the actual file transfer. The client establishes the first connection to the server for control traffic and the second connection for the actual file transfer. This connection is created every time there is a file to be transferred. The client can download a file from or upload a file to the server

What two characteristics describe an FTP connection? (Choose two.)

HTTP

Hypertext Transfer Protocol (HTTP) is a protocol that is used by web servers to serve up a web page.

Which protocol is used by web servers to serve up a web page?

POP3

The POP3 email protocol will download messages off a server as the client accesses them. By default, these messages will not be kept on the server once they have been accessed by a client.