Verification Guide: PTL-0055 — Integrated Branch Network Troubleshooting Challenge

Overview#

This verification guide provides detailed instructions and verification criteria for PTL-0055: Integrated Branch Network Troubleshooting Challenge. Learners isolate and resolve multi-domain branch office faults spanning VLAN trunking, DHCP relay, static routing, and access control lists.

Device Role and Interface Reference#

Test Execution Matrix#

Positive Verification (Completed State: completed.pkt)#

Starter Fault Verification (Starter State: starter.pkt)#

Detailed Step-by-Step Remediation Procedure#

1. Step 1: Check Trunk Allowed VLANs on Branch-SW1

   • Issue show interfaces trunk on Branch-SW1.
   • Observe that Vlans allowed on trunk lists only 10.
   • Remediate with:

     Branch-SW1(config)# interface GigabitEthernet0/1
     Branch-SW1(config-if)# switchport trunk allowed vlan add 20
     

2. Step 2: Restore DHCP Relay on Branch-R2

   • Issue show running-config interface GigabitEthernet0/0.10 on Branch-R2.
   • Observe absence of ip helper-address.
   • Remediate with:

     Branch-R2(config)# interface GigabitEthernet0/0.10
     Branch-R2(config-subif)# ip helper-address 10.0.1.1
     

3. Step 3: Fix HQ-R1 Static Return Routes

   • Issue show ip route static on HQ-R1.
   • Observe misconfigured next-hop 10.1.12.6.
   • Remediate with:

     HQ-R1(config)# no ip route 192.168.0.0 255.255.0.0 10.1.12.6
     HQ-R1(config)# ip route 192.168.10.0 255.255.255.0 10.1.12.2
     HQ-R1(config)# ip route 192.168.20.0 255.255.255.0 10.1.12.2
     

4. Step 4: Update Edge ACL on Branch-R2

   • Issue show access-lists on Branch-R2.
   • Observe 10 deny icmp any host 10.0.1.100.
   • Remediate with:

     Branch-R2(config)# no access-list 101
     Branch-R2(config)# access-list 101 permit ip any any
     

5. Step 5: Verify End-to-End Operation

   • Execute POS-01 through POS-06 to ensure 100% connectivity.