Remote access technology

Telnet - port 23 sends text-based commands and is unencrypted not secure.

secure shell - port 22 - encrypts everything that is being sent and recived between the client and the server.

RDP - port 3389 - provides graphicle interface to connect to another computer over a network.

RGD can create a secure gateway and then tunnel into a

RDG - provides. secure connection using SSL/TLS to secure RTP.

VNC - port 5900 designed for thin client archiceture or VDI.

Virtual desktop infristructure. hosts a desktop enfrin on a centalized server. Desktop as a service.

In band - using telnet or SSH.

out of band - connecting to th emanagement network to manage the devices on the network.

API - Application prgramming interface. set of protocols and routines for building and interacing with software applications. allow for direct intergration of different tird party

🌍 Remote Access Technologies

🔑 Core Protocols

Telnet (TCP/23)
- Text-based remote command access.
- ⚠️ Unencrypted → insecure, replaced by SSH.
SSH – Secure Shell (TCP/22)
- Encrypted alternative to Telnet.
- Used for secure CLI management (routers, switches, Linux servers).
RDP – Remote Desktop Protocol (TCP/3389)
- Microsoft protocol for graphical remote access.
- Used to connect to Windows desktops/servers.
RDG – Remote Desktop Gateway
- Wraps RDP inside SSL/TLS for secure tunneling.
- Allows RDP connections over the internet safely.
VNC – Virtual Network Computing (TCP/5900)
- Provides graphical desktop sharing.
- Often used in thin client or VDI (Virtual Desktop Infrastructure) setups.

🖥️ Virtual Desktop Infrastructure (VDI)

Runs desktops on centralized servers → accessed remotely.
Can be delivered as DaaS (Desktop as a Service) from the cloud.

⚙️ Management Access

In-Band Management
- Uses the same network as production traffic.
- Examples: SSH, RDP, Telnet.
Out-of-Band Management
- Uses a separate management network or console connection.
- Used when the production network is down.

🔗 API (Application Programming Interface)

Set of rules/protocols for interacting with software.
Allows direct integration of third-party apps/services.
Common in cloud, automation, and remote management.

✅ Exam Tips

Telnet = insecure, SSH = secure.
RDP = graphical remote access, enhanced by RDG.
VNC = platform-independent GUI remote access.
In-band = production network, Out-of-band = dedicated mgmt path.
API = enables automation and remote integration.

⚡ Sample Exam Question:

“Which remote access technology provides secure CLI management by encrypting all session traffic?”

→ SSH (TCP/22)