Complete step-by-step Packet Tracer (.PKA) lab solution for 7.4.1 Packet Tracer - Implement DHCPv4 (Full .PKA Lab Router DHCP Pool & IP Helper Solution). Includes the Topology Addressing Table, Missing Score Checklist (94% or 96% -> 100% Fix), multi-device Cisco IOS CLI scripts, and 10 interactive lab verification questions.
1. Topology & Addressing Table (7.4.1)
| Device | Interface | IP Address | Subnet Mask | Gateway |
|---|---|---|---|---|
| S1 (Distribution) | Port-channel 1 & 2 | Trunk (802.1Q) | Native VLAN 99 | Layer 2 Trunk |
| S2 & S3 (Access) | Port-channel 2 & 3 | Trunk (802.1Q) | Native VLAN 99 | Layer 2 Trunk |
⚠️ Stuck at 94% or 96% in Packet Tracer? (3 Hidden Grader Checks)
1. Check #1: Configured 'switchport mode trunk' on physical interfaces BEFORE creating 'channel-group'.
2. Check #2: Mismatch between LACP ('mode active') and PAgP ('mode desirable') across S1, S2, and S3.
3. Check #3: Forgot to re-apply 'switchport mode trunk' directly under 'interface Port-channel 1', '2', and '3'.
2. Complete Multi-Device Cisco IOS CLI Solution (7.4.1)
S1 (Distribution) Configuration Script
S1 (Distribution) — IOS CLI
enable configure terminal interface range g0/1 - 2 shutdown channel-group 1 mode active no shutdown interface port-channel 1 switchport mode trunk interface range f0/21 - 22 shutdown channel-group 2 mode desirable no shutdown interface port-channel 2 switchport mode trunk end copy running-config startup-config
S2 & S3 (Access) Configuration Script
S2 & S3 (Access) — IOS CLI
enable configure terminal interface range g0/1 - 2 shutdown channel-group 1 mode active no shutdown interface port-channel 1 switchport mode trunk interface range f0/23 - 24 shutdown channel-group 3 mode active no shutdown interface port-channel 3 switchport mode trunk end copy running-config startup-config
3. Practical Lab Verification Quiz (10 Interactive Questions)
Lab Question 1While configuring 7.4.1 in Packet Tracer, your score is stuck at 94% or 96% even though pings succeed. What is the #1 configuration item missed?
✔ Correct Answer: A. Configured 'switchport mode trunk' on physical interfaces BEFORE creating 'channel-group'.
Lab Verification Note: Always verify with
show etherchannel summary | show interfaces trunk and save configuration to NVRAM.Lab Question 2Refer to the Addressing Table in 7.4.1. Which command sequence configures S1 (Distribution) (Port-channel 1 & 2)?
✔ Correct Answer: B. ip address Trunk (802.1Q) Native VLAN 99 and no shutdown
Lab Verification Note: Always verify with
show etherchannel summary | show interfaces trunk and save configuration to NVRAM.Lab Question 3During Part 2 of 7.4.1, which second common mistake prevents reaching 100%?
✔ Correct Answer: C. Mismatch between LACP ('mode active') and PAgP ('mode desirable') across S1, S2, and S3.
Lab Verification Note: Always verify with
show etherchannel summary | show interfaces trunk and save configuration to NVRAM.Lab Question 4Which Cisco IOS verification command confirms operational status for 7.4.1?
✔ Correct Answer: A. show etherchannel summary | show interfaces trunk
Lab Verification Note: Always verify with
show etherchannel summary | show interfaces trunk and save configuration to NVRAM.Lab Question 5What is the third critical grader check required before submitting 7.4.1?
✔ Correct Answer: D. Forgot to re-apply 'switchport mode trunk' directly under 'interface Port-channel 1', '2', and '3'.
Lab Verification Note: Always verify with
show etherchannel summary | show interfaces trunk and save configuration to NVRAM.Lab Question 6What happens if the Native VLAN is mismatched on an 802.1Q trunk link in 7.4.1?
✔ Correct Answer: B. CDP logs native VLAN mismatch alerts and PVST+ blocks the inconsistent VLAN.
Lab Verification Note: Always verify with
show etherchannel summary | show interfaces trunk and save configuration to NVRAM.Lab Question 7If a switch port configured with Port Security violates the max MAC count in default mode, what state does it enter?
✔ Correct Answer: C. err-disabled (requires shutdown and no shutdown to recover)
Lab Verification Note: Always verify with
show etherchannel summary | show interfaces trunk and save configuration to NVRAM.Lab Question 8Why must you execute 'copy running-config startup-config' before submitting 7.4.1 or a 200-301 PBQ Simlet?
✔ Correct Answer: A. To save active RAM configuration into non-volatile NVRAM so grading scripts score it.
Lab Verification Note: Always verify with
show etherchannel summary | show interfaces trunk and save configuration to NVRAM.Lab Question 9If a router learns a /24 route via OSPF (AD 110) and a Floating Static Route configured with AD 5, which enters the routing table?
✔ Correct Answer: B. The Floating Static Route (AD 5) because 5 is lower than OSPF AD 110.
Lab Verification Note: Always verify with
show etherchannel summary | show interfaces trunk and save configuration to NVRAM.Lab Question 10Where should an Extended IPv4 ACL (100-199) be placed according to Cisco best practices?
✔ Correct Answer: D. As close to the SOURCE of the traffic as possible.
Lab Verification Note: Always verify with
show etherchannel summary | show interfaces trunk and save configuration to NVRAM.