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Zorluk: OrtaRemote Access and Out-of-Band Management

A network administrator receives an alert indicating that a remote data facility has experienced a total WAN transport link failure, rendering all primary IP interfaces and in-band networks unreachable. The administrator needs to gain direct command-line access to the core router to diagnose the interface state and attempt configuration recovery. Which of the following remote access mechanisms will allow the administrator to establish access to the device under these conditions?

  1. A cellular modem connected to a serial console server wired to the router's console portCevap
  2. B
    An SSH v2 session established over TCP port 22 to the router's loopback interface IP address
  3. C
    An encrypted Telnet session routed over TCP port 23 to the router's virtual terminal lines
  4. D
    An SNMPv3 command walk targeted at UDP port 161 on the router's management VLAN interface

Cevap

A cellular modem connected to a serial console server wired to the router's console port provides an out-of-band connection that does not rely on the failed primary WAN link or local IP infrastructure.
Out-of-band (OOB) management allows administrators to manage network devices via dedicated alternative pathways that operate independently of the primary production network. Connecting a cellular modem to a console/terminal server wired directly to a network device's RS-232/RJ-45 console port provides secure, direct CLI access regardless of whether the primary WAN link or IP stack on the device is functioning.

Adım Adım Çözüm

1
Analyze the operational constraints presented in the scenario.
Identified that the primary WAN transport link has completely failed, making all in-band IP pathways unreachable.
When in-band IP networks fail, standard remote management protocols that rely on production IP routing cannot reach the device.
2
Differentiate between in-band and out-of-band (OOB) management technologies.
Out-of-band access uses independent communication paths (such as cellular modems or PSTN lines connected to console servers) to reach serial management ports.
Serial console access bypassed network stack failures, allowing interactive CLI access even when IP interface routing is down.
3
Select the mechanism that satisfies out-of-band requirements.
The cellular-connected console server provides direct access to the console port completely independent of the WAN status.
Cellular console servers establish an alternate external communication path directly to device console hardware.

Anahtar Kavram

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

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