Computer Networks and File Formats

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What protocol is used for sending mail?

POP

IMAP

HTTP

SMTP (correct)

What is the minimum required components of an SMTP message?

Sender address and recipient address

Message header and message body (correct)

Message body and recipient address

Message header and sender address

What is the primary function of a client's SMTP process?

To store email locally

To send email to a mail server (correct)

To forward email to another mail server

To receive email from a mail server

What is the primary function of the presentation layer?

To format data for the application layer Signup and view all the answers

What happens to a message if it is not delivered after a predetermined expiration time?

It is returned to the sender as undeliverable Signup and view all the answers

What is the purpose of a mail server periodically checking the queue for messages?

To attempt to send messages again Signup and view all the answers

What is the purpose of DNS in the application layer?

To translate domain names into IP addresses Signup and view all the answers

What is the purpose of application layer protocols?

To specify the format and control information for communication Signup and view all the answers

What happens to messages when the destination email server is not online or busy?

They are spooled to be sent at a later time Signup and view all the answers

What is the main purpose of POP and IMAP?

To retrieve email from a mail server Signup and view all the answers

What is the file format for video that is mentioned in the text?

MKV Signup and view all the answers

On which port does the client SMTP process connect with a server SMTP process?

Port 25 Signup and view all the answers

What is the purpose of the session layer in the TCP/IP model?

To initiate dialogs and keep them active Signup and view all the answers

Which of the following is NOT a characteristic of the DNS protocol?

Establishes a secure connection Signup and view all the answers

What is the purpose of the application layer in the TCP/IP model?

To provide services to end-user applications Signup and view all the answers

What is the file format for graphics that is mentioned in the text?

GIF Signup and view all the answers

Why were domain names created?

To convert numeric IP addresses into a simple, recognizable name Signup and view all the answers

What is the purpose of the DNS protocol?

To define the format for queries and responses Signup and view all the answers

What is an FQDN?

Fully-Qualified Domain Name Signup and view all the answers

What is the format used for DNS communications?

A single format called a message Signup and view all the answers

What type of records does a DNS server store?

Resource records Signup and view all the answers

What information does a resource record contain?

Name, address, and type of record Signup and view all the answers

Why would it be difficult to use IP addresses instead of URLs?

Because IP addresses are harder to remember Signup and view all the answers

What is the purpose of the DNS service?

To match resource names with numeric network addresses Signup and view all the answers

What is the primary function of DNS?

To provide name resolution Signup and view all the answers

How does DNS maintain its database?

By using a hierarchical system with multiple zones Signup and view all the answers

What is the purpose of breaking down the naming structure into zones?

To create smaller, manageable portions Signup and view all the answers

What happens when a DNS server receives a request for a name translation not within its zone?

The request is forwarded to another DNS server Signup and view all the answers

What is an example of a top-level domain?

.com Signup and view all the answers

What is the primary purpose of the File Transfer Protocol (FTP)?

To allow for data transfers between a client and a server Signup and view all the answers

What is the primary purpose of the nslookup command?

To troubleshoot name resolution issues Signup and view all the answers

What is the role of an FTP client?

To run on a computer and push and pull data from an FTP server Signup and view all the answers

Who typically provides the DNS server addresses for a network device?

The ISP Signup and view all the answers

What is the TCP port used for control traffic in FTP?

TCP port 21 Signup and view all the answers

What is displayed when the nslookup command is issued?

The default DNS server configured for the host Signup and view all the answers

What is the direction of data transfer in FTP?

In both directions, depending on the request Signup and view all the answers

What is the Server Message Block (SMB) protocol?

A client-server, request-response file sharing protocol Signup and view all the answers

What can servers make available to clients on the network using SMB?

Their own resources, such as directories, files, printers, and serial ports Signup and view all the answers

What is the primary purpose of the Server Message Block (SMB) protocol?

To describe the structure of shared network resources Signup and view all the answers

What is the relationship between the client and the server in the SMB protocol?

Client-server, where the client requests resources from the server Signup and view all the answers