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Question

Difficulty: EasyRemote Access and Out-of-Band Management

A network administrator needs to select remote access mechanisms for data center infrastructure that provide secure, encrypted command-line management or function out-of-band during a primary production network outage. Which of the following options satisfy these requirements? (Select TWO)

  1. Connecting device serial console ports to a dedicated terminal server accessible via an external cellular modemAnswer
  2. Establishing a Secure Shell (SSH) connection over a dedicated out-of-band management interfaceAnswer
  3. C
    Establishing an unencrypted Telnet connection over port 23 across the primary production VLAN
  4. D
    Configuring unencrypted SNMPv2c read-write community strings over the primary production WAN connection

Answer

Connecting device serial console ports to a dedicated terminal server with cellular backup, and establishing Secure Shell (SSH) connections over an isolated out-of-band management interface.
Out-of-band management relies on dedicated physical or secondary paths (such as serial console connections to a terminal server backed by cellular connectivity) to reach devices independently of production IP networks. For remote management, Secure Shell (SSH) ensures administrative commands and credentials are securely encrypted.

Step-by-Step Solution

1
Identify methods that provide true out-of-band (OOB) connectivity during primary network failures.
Connecting physical console/serial ports to a terminal server paired with an independent transport channel (such as a cellular modem) allows network administrators to manage hardware even when primary and secondary WAN links are down.
Out-of-band management requires an alternate physical or logical pathway isolated from standard production data paths.
2
Identify secure, encrypted remote access protocols.
Secure Shell (SSH) encrypts all traffic (including passwords and commands) to prevent eavesdropping and unauthorized access, especially when paired with a dedicated out-of-band management network.
In-band unencrypted protocols such as Telnet or legacy SNMP transmit credentials in cleartext and present unacceptable security risks.

Key Concept

Out-of-Band Management & Secure Remote Access Protocols
Estimated Time:1m 0s
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Topics

Remote Access and Out-of-Band Management

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