W2 - Transport Layer Services (SY24-25/C305-302I)

FTP

SMTP

DNS

HTTP

The client directly accesses the server without resolving the IP address.

The client sends a DNS request to resolve the IP address of the server, then establishes a connection.

The client encrypts data before requesting access.

The client needs no IP address to connect to the server.

The client sends a request packet to the server, which processes and responds to it.

The client sends an encrypted request to the server.

The client sends data directly through an intermediary server.

The client sends data through multiple redundant servers.

Connectionless communication

Fast transmission without error-checking

Unreliable delivery

Guaranteed data delivery

Live streaming

Email communication

File transfer

Secure transactions

UDP doesn’t use port numbers.

UDP uses port numbers only for encryption.

UDP uses the same port numbers as TCP for all communications.

UDP uses port numbers to route data to the correct application without establishing a connection.

The connection fails, and an error is returned to the client.

The connection is established but data is dropped.

The client retries on another port.

The server automatically reroutes to a different port.

The DNS server failed to resolve the website’s domain name to an IP address.

The server is overloaded.

Your computer's firewall is blocking the connection.

The website is using an outdated HTTP version.

The user’s computer has been assigned an invalid IP address.

The DNS server is down.

The web server is offline.

The default gateway configuration is incorrect.

20

21

80

110

Checking the server’s firewall rules

Running a ping test to the server’s IP address

Ensuring the server’s application is running

Updating the client application to the latest version

TCP

UDP

HTTP

FTP