10 Questions
Which protocol is used for sending mail at the application layer?
SMTP
What port does the client SMTP process connect to when sending email?
Port 25
Which protocol is used for retrieving email at the application layer?
POP3
What is required in the message header of an SMTP message?
Properly formatted recipient email address and a sender address
What does SMTP do if the destination email server is not online when messages are sent?
Spools messages to be sent at a later time
What does a mesh topology entail?
Every device has a dedicated point-to-point link to every other device
What is the characteristic of a star topology?
Devices are connected to a central hub
How is data flow managed in a ring topology?
Devices are connected in a circular manner with data flowing in one direction
What is the defining feature of bus topology?
Devices are connected in a linear manner with terminators at each end
What does logical topology define?
How the information or data flows within the network
Study Notes
Email Protocols
- SMTP (Simple Mail Transfer Protocol) is used for sending mail at the application layer.
- The client SMTP process connects to port 25 when sending email.
- POP (Post Office Protocol) or IMAP (Internet Message Access Protocol) are used for retrieving email at the application layer.
SMTP Message Header
- A valid email address is required in the message header of an SMTP message.
SMTP Message Delivery
- If the destination email server is not online when messages are sent, SMTP holds the message and attempts to deliver it later.
Network Topologies
Mesh Topology
- A mesh topology entails a network where each device is connected to every other device.
Star Topology
- The characteristic of a star topology is that all devices are connected to a central device or hub.
Ring Topology
- Data flow is managed in a ring topology through a circular configuration where data travels in one direction around the ring.
Bus Topology
- The defining feature of bus topology is a single cable that connects all devices in a linear sequence.
Logical Topology
- Logical topology defines how data is transmitted and routed through a network, regardless of the physical connections.
Test your knowledge of email protocols with this quiz covering SMTP, POP3, and IMAP. Learn about the communication between email clients and servers, as well as the transfer of messages between mail servers.
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