Cisco Certified Network Associate (CCNA) (200-301)

To complete the tasks for your lab, here are the Cisco IOS commands required for each configuration step based on your provided topology.

Task 1: SW-1 Port e0/0 (VLAN Truncation)

To permit only specific VLANs on a trunk port, you must set the allowed list.

Bash

SW-1(config)# interface e0/0

SW-1(config-if)# switchport trunk allowed vlan 5,6

Task 2: Native VLAN Configuration

Both ends of the trunk must have the same native VLAN to prevent mismatch errors.

Bash

# On SW-1

SW-1(config)# interface e0/1

SW-1(config-if)# switchport trunk native vlan 77

# On SW-2

SW-2(config)# interface e0/1

SW-2(config-if)# switchport trunk native vlan 77

Task 3: SW-2 Port e0/2 (VLAN Truncation)

Similar to Task 1, restrict the trunk to only VLAN 6.

Bash

SW-2(config)# interface e0/2

SW-2(config-if)# switchport trunk allowed vlan 6

Task 4: LACP Port Channel (SW-3 and SW-4)

To create the Po34 interface using LACP, you must group the interfaces on both switches.

Configuration for SW-3:

Bash

SW-3(config)# interface range e0/0 - 1

SW-3(config-if-range)# channel-group 34 mode active

Configuration for SW-4:

Bash

SW-4(config)# interface range e0/0 - 1

SW-4(config-if-range)# channel-group 34 mode active

✅ Option B (Correct)
Reasoning: The data plane, also known as the forwarding plane, is responsible for the actual forwarding of user-generated traffic packets through the network devices. It executes the forwarding decisions that are programmed by the control plane. When a packet arrives at a network device, the data plane consults its forwarding information base (FIB) or switching table to determine the outgoing interface and forwards the packet.

❌ Why the other choices are incorrect:

• Option A is incorrect: The policy plane defines high-level business rules and network policies. It does not directly forward user traffic; instead, it influences the configuration and decisions made by the control plane.
• Option C is incorrect: The management plane is used for managing network devices (e.g., configuration, monitoring, troubleshooting, software updates). It handles management traffic, not user-generated data traffic.
• Option D is incorrect: The control plane is responsible for making forwarding decisions. It builds and maintains routing tables, MAC address tables, and other forwarding information, then programs these decisions into the data plane. It does not directly forward user-generated traffic.

• REST API (A): Representational State Transfer (REST) APIs are widely adopted as the primary technology for Northbound communication in SDN. They provide a flexible, stateless, and standardized way for applications to interact with the SDN controller, enabling them to request network services, retrieve network state, and apply policies.
• OpenFlow (B): OpenFlow is a Southbound interface protocol. It defines the communication between the SDN controller and the forwarding plane of network devices (switches and routers), allowing the controller to program network device behavior. It is not used for communication with applications.
• NETCONF (C): Network Configuration Protocol (NETCONF) is a protocol used for configuring network devices. While an SDN controller might use NETCONF for device management (acting as a form of Southbound interface), it is not the typical or primary technology used for applications to communicate with the controller for higher-level network service requests.
• Southbound API (D): This is a category of APIs that describes communication between the SDN controller and network devices, not between the controller and applications. Therefore, it is incorrect for the specified purpose.

Generative AI excels at creating new content, data, or models based on learned patterns. In network operations, this capability can be leveraged to generate synthetic network configurations for various purposes, such as testing new designs, simulating network behavior, or even assisting in the initial drafting of complex configurations. This directly aligns with the 'generative' aspect of the technology.

Option A describes optimization, not generation. Option B involves automation of deployment, which is a different function. Option C is a task of network management or optimization, not creation. Therefore, creating synthetic network configurations is the most fitting function of generative AI in this context.

✅ Option C (Correct)
Reasoning: The HTTP GET method is primarily used to request data from a specified resource. A successful GET request consistently returns a 200 (OK) status code, indicating that the request has succeeded and the requested data is included in the response body.

❌ Why the other choices are incorrect:

• Option A is incorrect: The PATCH method applies partial modifications to a resource. A successful PATCH typically returns 200 (OK) if the response body contains the updated resource, or 204 (No Content) if the response body is empty. While it can return 200, it's not its sole or most distinct success code.
• Option B is incorrect: The POST method submits an entity to a specified resource, often resulting in a change of state or creation of a new resource. A successful POST most commonly returns 201 (Created) when a new resource is created. It can return 200 (OK) if the action resulted in a non-resource representation or if the operation was successful without creating a new resource, but 201 is more characteristic for resource creation.
• Option D is incorrect: The DELETE method removes the specified resource. A successful DELETE typically returns 204 (No Content) if no response body is needed, or 200 (OK) if the response includes an entity describing the status (e.g., confirmation of deletion). Like PATCH, 200 is possible but 204 is also very common.

✅ Option C (Correct)

Reasoning: Ansible is an agentless configuration management tool that relies on standard SSH (Secure Shell) to communicate with managed nodes. SSH, by default, uses TCP port 22 for secure remote access and command execution. This allows Ansible to push configurations, execute modules, and gather facts without requiring a special agent installed on the target systems.

❌ Why the other choices are incorrect:

• Option A is incorrect: Chef uses a client-server model. The Chef client communicates with the Chef server primarily over HTTP/HTTPS (typically ports 80/443), not SSH (TCP port 22).
• Option B is incorrect: Python is a programming language, not a configuration management mechanism itself. While Python can be used to write scripts for configuration management, it does not inherently define a default communication port for node management in the way a dedicated tool like Ansible does.
• Option D is incorrect: Puppet also operates using a client-server architecture. Puppet agents communicate with the Puppet master primarily over HTTPS, typically using TCP port 8140 by default, not SSH (TCP port 22).

Correct Answer: D

The provided mapping correctly identifies the distinct roles and characteristics of Access Points (APs) and Wireless LAN Controllers (WLCs) in a modern wireless network architecture.

Access Point

• ✅ 'ability to boost a wi-fi signal' matches with -> Access Point
  Reasoning: Access Points can operate in different modes, including repeater or mesh mode. In these modes, an AP can extend the range of an existing wireless network, effectively boosting the Wi-Fi signal in areas with poor coverage.
• ✅ 'interconnects wireless LANs to a wired network' matches with -> Access Point
  Reasoning: This is the primary function of an Access Point. It acts as a bridge, translating frames between the wireless (IEEE 802.11) medium and the wired Ethernet (IEEE 802.3) medium, allowing wireless clients to access the LAN.

Wireless LAN Controller

• ✅ 'uses templates to implement QOS configuration' matches with -> Wireless LAN Controller
  Reasoning: A WLC centralizes the management of multiple APs. It utilizes templates and profiles to enforce consistent policies, such as Quality of Service (QoS) for voice and video traffic, across the entire wireless infrastructure.
• ✅ 'supplies user connection data within a device group' matches with -> Wireless LAN Controller
  Reasoning: The WLC serves as a central aggregation point for monitoring data. It collects statistics, client connection information, and performance metrics from all managed APs (which form a device group), providing administrators with a holistic view of the network's health.

The output shows "Total output drops: 100". Output drops occur when the interface's transmit queue overflows because it cannot send packets fast enough, indicating congestion or queueing on the interface. The "Output queue: 50/300" further shows active queue usage.

Why other options are incorrect:
* A: broadcast storm: A broadcast storm would typically show very high input rates and potentially input errors or CPU utilization, which are not present. The input rate is 0 packets/sec.
* C: bad NIC: A faulty NIC usually presents with various input/output errors (CRC, frame, overrun), interface resets, or link instability, none of which are observed.
* D: duplex mismatch: Duplex mismatch, especially with full-duplex on one side and half-duplex on the other, would result in high collision counts (e.g., collisions, late collisions, deferred), which are all zero in this output.

✅ Option C (Correct)

❌ Why the other choices are incorrect:

• Option A: QoS trust is incorrect: QoS trust is a configuration setting that dictates whether a port trusts the Quality of Service markings (e.g., DSCP or CoS) of incoming traffic. While essential for traffic prioritization, it is not a port *type* that inherently provides increased bandwidth or link redundancy for heavy traffic and resilience.
• Option B: PoE is incorrect: Power over Ethernet (PoE) delivers electrical power along with data over Ethernet cabling. WLCs themselves typically receive power via an AC adapter and their uplink ports generally do not use PoE. PoE is primarily used to power devices like access points or IP phones, not to enhance WLC uplink performance or resilience.
• Option D: trunk is incorrect: A trunk port is configured to carry traffic for multiple VLANs across a single link. While WLC distribution system ports are almost always configured as trunk ports to support various WLAN VLANs, 'trunk' describes the *mode* of operation for VLAN tagging, not a mechanism for bundling multiple physical links for bandwidth aggregation and fault tolerance. A single trunk port, by itself, does not provide the 'maximum resilience' and 'heavy traffic' handling *through aggregation* that LAG does.