Latest 200-301 Practice Questions - Good Materials for Cisco CCNA Exam Preparations

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1. What is a benefit of using a Cisco Wireless LAN Controller?

A. Central AP management requires more complex configurations

B. Unique SSIDs cannot use the same authentication method

C. It supports autonomous and lightweight APs

D. It eliminates the need to configure each access point individually

Answer: D

Explanation:

Without a WLC, each AP in a network would need to be configured individually, which is time-consuming and prone to inconsistencies. A WLC allows network administrators to configure all APs centrally. This ensures uniformity in configuration, enhances security, and simplifies the management of the wireless network. Updates, security policies, and settings can be pushed out to all APs from the WLC, making the overall network management more efficient.

2. Which attribute does a router use to select the best path when two or more different routes to the same destination exist from two different routing protocols?

A. dual algorithm

B. metric

C. administrative distance

D. hop count

Answer: C

Explanation:

Administrative Distance (AD) is a value that routers use to rank the trustworthiness of a route that has been learned from a particular routing protocol. Each routing protocol is assigned a default administrative distance value, and the router uses this value to determine which route to trust if multiple routing protocols provide routes to the same destination.

3. Which two encoding methods are supported by REST APIs?

A. YAML

B. JSON

C. EBCDIC

D. SGML

E. XML

Answer: BE

Explanation:

REST (Representational State Transfer) APIs are designed to communicate between systems using standardized methods. One of the key aspects of REST APIs is the format in which data is encoded and exchanged. The two most common encoding methods supported by REST APIs are JSON (JavaScript Object Notation) and XML (eXtensible Markup Language). JSON is a lightweight data interchange format that is easy for humans to read and write, and easy for machines to parse and generate. And, XML is another commonly used data format for REST APIs. It is more verbose than JSON and is designed to be both human- and machine-readable.

4. In Which way does a spine and-leaf architecture allow for scalability in a network when additional access ports are required?

A. A spine switch and a leaf switch can be added with redundant connections between them

B. A spine switch can be added with at least 40 GB uplinks

C. A leaf switch can be added with a single connection to a core spine switch.

D. A leaf switch can be added with connections to every spine switch

Answer: D

Explanation:

Option D is the best method for scalability. By connecting the new leaf switch to every spine switch, it ensures balanced traffic distribution, maintains low latency, and provides redundancy, all critical aspects for scaling the network efficiently.

5. Which two actions are performed by the Weighted Random Early Detection mechanism?

A. It drops lower-priority packets before it drops higher-priority packets

B. It can identify different flows with a high level of granularity

C. It guarantees the delivery of high-priority packets

D. It can mitigate congestion by preventing the queue from filling up

E. it supports protocol discovery

Answer: AD

Explanation:

Option A: WRED can differentiate between packets based on their priority (using IP precedence or Differentiated Services Code Point (DSCP)). It assigns different drop probabilities to different types of traffic. Lower-priority packets are more likely to be dropped than higher-priority packets when congestion begins to build up. This helps in maintaining higher quality of service (QoS) for important traffic.

Option D: This is a primary function of WRED. By starting to drop packets randomly before the queue is full, WRED helps to signal the sender to slow down (congestion avoidance), preventing the queue from becoming completely full and avoiding the more drastic consequences of tail drop (where packets are dropped only when the queue is completely full).

6. Which mode allows access points to be managed by Cisco Wireless LAN Controllers?

A. autonomous

B. lightweight

C. bridge

D. mobility express

Answer: B

Explanation:

- Lightweight Access Points operate in conjunction with a Cisco Wireless LAN Controller (WLC).

- In this mode, the access points are referred to as lightweight access points (LAPs).

- The management functions (such as configuration, management, and policy enforcement) are offloaded to the WLC.

- LAPs communicate with the WLC using the Control and Provisioning of Wireless Access Points (CAPWAP) protocol.

- The WLC handles tasks such as authentication, association, security management, and more, allowing for centralized management of multiple access points.

- This setup simplifies large-scale deployments as configurations and policies are managed centrally from the WLC.

7. What is the default behavior of a Layer 2 switch when a frame with an unknown destination MAC address is received?

A. The Layer 2 switch drops the received frame

B. The Layer 2 switch floods packets to all ports except the receiving port in the given VLAN.

C. The Layer 2 switch sends a copy of a packet to CPU for destination MAC address learning.

D. The Layer 2 switch forwards the packet and adds the destination MAC address to its MAC address table

Answer: B

Explanation:

Option B is the correct default behavior for most Layer 2 switches. When a switch receives a frame with a destination MAC address that is not in its MAC address table (CAM table), it floods the frame out of all ports in the same VLAN except the port on which the frame was received. This flooding ensures that the frame reaches its destination device even if the switch does not initially know where that device is connected.

8. Which type of attack can be mitigated by dynamic ARP inspection?

A. worm

B. malware

C. DDoS

D. man-in-the-middle

Answer: D

Explanation:

Dynamic ARP Inspection operates by inspecting Address Resolution Protocol (ARP) packets within a network. ARP is crucial for translating IP addresses into MAC addresses (and vice versa) on a local network segment. However, ARP is inherently vulnerable to various types of attacks, particularly ARP spoofing attacks, which are a common form of MitM attack. In an ARP spoofing attack, an attacker sends falsified ARP messages over the local network to associate their MAC address with the IP address of a legitimate network device, such as a gateway or another host. This allows the attacker to intercept, modify, or block network traffic intended for the legitimate device, leading to potential data theft, traffic redirection, or service disruption. By implementing Dynamic ARP Inspection, network administrators can protect against ARP spoofing attacks and thereby mitigate the risk of man-in-the-middle attacks, ensuring network integrity and security.