Quiz Entry - updated: 2026.07.14
What are the three methods to access a Cisco IOS device, and which is the most secure for remote access?
Console (physical, for initial setup), SSH (secure encrypted remote), and Telnet (insecure plaintext remote) — SSH is the most secure for remote access.
| Method | Description |
|---|---|
| Console | Physical management port used for initial configuration and maintenance |
| SSH (Secure Shell) | Establishes a secure, encrypted remote CLI connection over a network |
| Telnet | Establishes an insecure remote CLI connection (sends data in plaintext) |
Best Practice: Always use SSH (Version 2) instead of Telnet whenever possible because Telnet sends authentication and commands in plaintext.
Go deeper:
Jeremy's IT Lab — SSH (CCNA Day 42) — configures secure remote CLI access and contrasts it with plaintext Telnet.
Secure Shell (Wikipedia) — the cryptographic protocol that replaced Telnet for remote login.- Telnet (Wikipedia) — why a plaintext virtual-terminal protocol is unsafe on modern networks.