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Zorluk: OrtaRemote Access and Out-of-Band Management

A network engineering team is auditing emergency access procedures for remote branch office infrastructure. The goal is to maintain administrative control and restore unresponsive devices even during a complete failure of the primary ISP circuit. Which TWO of the following components or methods provide an effective out-of-band (OOB) management solution? (Select TWO)

  1. A cellular-backed serial console server connected to device console management portsCevap
  2. A network-connected switched Power Distribution Unit (PDU) to remotely hard power-cycle locked equipmentCevap
  3. C
    In-band Telnet management enabled on the primary router WAN interface for emergency CLI access
  4. D
    Unencrypted SNMPv2c polling enabled across primary internal VLANs for emergency configuration pushes

Cevap

Deploying a cellular-backed serial console server connected to device console ports and using a network-connected switched Power Distribution Unit (PDU) for remote power-cycling.
Out-of-band (OOB) management requires an alternate, physically isolated access path (such as a serial terminal server utilizing a cellular connection) to bypass failed primary network links. Additionally, a switched PDU provides out-of-band power control to perform hard reboots on frozen devices without physical technician intervention.

Adım Adım Çözüm

1
Analyze out-of-band (OOB) management requirements
OOB management requires a dedicated, redundant communication channel that remains operational when primary network interfaces or WAN circuits fail.
Connecting a terminal server to console ports over a cellular modem guarantees command-line access during primary link outages.
2
Identify remote hardware power recovery mechanisms
A switched PDU allows remote outlet power-cycling when an operating system or management interface becomes completely unresponsive.
Hard reboots require physical power control separate from operating system network stacks.
3
Evaluate and reject in-band and insecure management alternatives
Telnet and SNMPv2c are in-band management methods that depend on working primary network paths and lack proper security/encryption.
In-band tools become unreachable during primary ISP failure and expose network devices to cleartext credential interception.

Anahtar Kavram

Out-of-Band (OOB) Remote Access and Power Management Infrastructure
Tahmini Süre:1m 30s
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Remote Access and Out-of-Band Management

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