Security+ Lab · Router Hardening

Open the Gate: Permit Traffic on a Standard ACL

SY0-701 · 2.5 SY0-701 · 4.5 SY0-701 · 4.1

You are the evening network tech at Tidewater Mercantile. A coworker built standard access list 27 on the edge router MERIDIAN to keep two misbehaving lab hosts off the internal segment, then applied it inbound on GigabitEthernet0/1. Now the whole segment is dark — nothing gets through. The list only contains deny entries, and every Cisco ACL ends with an unwritten drop, so traffic that isn't explicitly allowed is discarded. Add a permit statement so normal traffic flows again while the two blocked hosts stay blocked, then make the fix survive a reboot.

Console — MERIDIAN

console 0 · 9600 8N1
MERIDIAN>

Task checklist

    Your tasks

    Need a refresher on the command path? 
    From the user prompt (MERIDIAN>), step up through the modes:

  enable                         → privileged mode  (MERIDIAN#)
  configure terminal             → global config    (MERIDIAN(config)#)
  access-list 27 permit any      → allow everything not denied above
  end                            → back to privileged mode
  copy running-config startup-config   → persist to NVRAM

Useful checks: "show access-lists", "show running-config".
Type "?" at any prompt for a short command list.

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