Quick recap of common protocols, email methods and the TCP/IP layered model.
1. What is a protocol?
A protocol is a set of rules that allows two devices to communicate.
2. Which protocol is used to send web pages securely?
HTTPS adds encryption and authentication, so it is used when websites handle sensitive information.
3. Which protocol is mainly used to transfer files between computers?
FTP is the protocol used for sending files between computers, often across a WAN.
4. Which email protocol keeps messages on the server so they stay in sync across devices?
IMAP keeps emails on the mail server, which helps maintain synchronisation between devices.
5. Which protocol is used to send outgoing email?
SMTP transfers outgoing email from a client to a server or between mail servers.
6. In the TCP/IP stack, which layer adds source and destination IP addresses?
The network layer uses IP and adds source and destination IP addresses so routers can direct packets.
7. Which layer uses TCP to split data into packets and add sequence numbers?
The transport layer establishes the connection and adds packet numbers and port numbers.
8. Why is layering useful in networking?
Layering reduces complexity and allows devices and software to work on defined responsibilities.