200-301 Question #1592: Real Exam Question with Answer & Explanation

Question

Lab Simulation 38 Guidelines This is a lab item in which tasks will be performed on virtual devices. - Refer to the Tasks tab to view the tasks for this lab item. - Refer to the Topology tab to access the device console(s) and perform the tasks. - Console access is available for all required devices by clicking the device icon or using the tab(s) above the console window. - All necessary preconfigurations have been applied. - Do not change the enable password or hostname for any device. - Save your configurations to NVRAM before moving to the next item. - Click Next at the bottom of the screen to submit this lab and move to the next question. - When Next is clicked, the lab doses and cannot be reopened. Topology Tasks All physical cabling is in place and verified. Connectivity for the Switches on ports E0/1, E0/2, and E0/3 must be configured and available for voice and data capabilities. 1. Configure Sw1 and Sw2 with both VLANS, naming them according to the topology. 2. Configure the E0/1, E0/2, and E0/3 ports on both switches for both VLANS and ensure that Cisco IP phones and PCs pass traffic. 3. Configure Sw1 and Sw2 to allow neighbor discovery via the vendor-neutral protocol on e0/0. Answer: See the below explanation

Explanation

The lab simulation requires configuring two switches with specified VLANs, setting up switch access ports for combined data and voice traffic, and enabling vendor-neutral neighbor discovery (LLDP) on their inter-switch link.

Approach. The correct interaction involves accessing the command-line interface (CLI) for both Sw1 and Sw2 (likely through a console tab or icon as per lab guidelines) and executing specific Cisco IOS commands. The steps must be performed on both switches:

Step 1: Create and Name VLANs (Task 1)

• Enter global configuration mode: configure terminal
• Create Data VLAN 201: vlan 201
• Name it 'Sales': name Sales
• Exit VLAN configuration: exit
• Create Voice VLAN 202: vlan 202
• Name it 'Sales_Voice': name Sales_Voice
• Exit VLAN configuration: exit

Step 2: Configure Access Ports for Voice and Data (Task 2)

• Enter interface range configuration mode for E0/1-3: interface range e0/1 - 3
• Set the port mode to access: switchport mode access
• Assign the data VLAN: switchport access vlan 201
• Assign the voice VLAN: switchport voice vlan 202
• Exit interface configuration: exit

Step 3: Configure LLDP on e0/0 (Task 3)

• Enable LLDP globally: lldp run
• Enter interface configuration mode for E0/0: interface e0/0
• Enable LLDP transmission on the interface: lldp transmit
• Enable LLDP reception on the interface: lldp receive
• Exit interface configuration: exit

Step 4: Save Configuration

• Return to privileged EXEC mode: end
• Save the running configuration to startup configuration (NVRAM): copy running-config startup-config (or write memory)

Common mistakes.

• common_mistake. Common mistakes include:

1. Forgetting to create VLANs: The ports cannot be assigned to VLANs that do not exist yet. Always create VLANs first.
2. Using switchport mode trunk on E0/1-3: These ports connect to end devices (IP phones and PCs) and should be access ports, not trunk ports which are for switch-to-switch links or links to routers that carry multiple VLANs.
3. Missing switchport access vlan or switchport voice vlan: Simply setting switchport mode access is insufficient; the specific data and voice VLANs must be assigned.
4. Using CDP instead of LLDP: Task 3 explicitly states 'vendor-neutral protocol,' which refers to LLDP, not Cisco's proprietary CDP (Cisco Discovery Protocol). Failing to enable lldp run globally or lldp transmit/receive on the interface would also be incorrect.
5. Not configuring all specified interfaces: The task requires E0/1, E0/2, AND E0/3, so using interface range e0/1 - 3 is critical.
6. Incorrect VLAN IDs or names: Mismatched IDs or names would lead to configuration errors or a failure to meet the requirements.
7. Forgetting to save the configuration: Changes made in running-config will be lost upon reboot if not saved to startup-config (NVRAM) using copy running-config startup-config.

Concept tested. This question tests the following core Cisco IOS networking concepts:

1. VLAN Configuration: Creation, naming, and management of Virtual Local Area Networks.
2. Voice VLAN (Auxiliary VLAN): Configuring switch ports to support both a data VLAN for connected PCs and a voice VLAN for connected IP phones, allowing separate traffic handling for each.
3. Access Port Configuration: Correctly setting up switch ports to connect to end devices.
4. Link Layer Discovery Protocol (LLDP): Understanding and configuring this vendor-neutral Layer 2 protocol for network device discovery, an alternative to CDP.
5. Basic Cisco IOS CLI Navigation and Configuration Saving: Proficiency in entering commands in different modes and persisting configurations.

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