Online Access Free H12-811-ENU Exam Questions

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No.# B. Probe

Before associating with an AP, a STA (Station or Wireless Client) broadcasts a Probe Request frame to discover available wireless networks in the area. This frame can contain a specific SSID or be a broadcast to discover all available SSIDs.

The AP then responds with a Probe Response frame, which includes information about the network, such as the SSID, BSSID, supported data rates, and other network parameters.

Based on the received Probe Responses, the STA can select a suitable network and initiate the association process.

No.# Given the scenario where the company has 50 private IP addresses but only one public IP address that is not fixed, the NAT conversion method that meets the needs is:

**C. NAPT (Network Address Port Translation)**

Here’s why:

- **NAPT (Network Address Port Translation)**: Also known as PAT (Port Address Translation) or overload, this method allows multiple private IP addresses to share a single public IP address by using different port numbers. This is ideal for situations where you have a limited number of public IP addresses but need to accommodate many internal devices.

- **Static NAT**: This method maps a specific private IP address to a specific public IP address. Since you only have one public IP address and it is not fixed, static NAT is not suitable because it does not handle dynamic or multiple connections efficiently.

- **Basic NAT**: This typically refers to static NAT where one private IP is mapped to one public IP address. It does not support multiple private IPs sharing a single public IP effectively.

- **Easy-IP**: This term might be specific to certain vendors or products, but in general NAT terminology, it does not describe a standard method for handling multiple private addresses with a single public address.

Therefore, **NAPT** is the correct method for translating multiple private IP addresses to a single public IP address, meeting the company’s needs....

No.# To implement route backup by configuring static floating routes, the correct approach is:

**B. The administrator needs to configure different metric values for the main static route and the standby static route**

Here's why:

- **Floating Static Routes**: This method involves configuring two static routes to the same destination, where one route is the primary (or main) route and the other is a backup (or floating) route. The primary route is chosen based on its lower metric value, while the backup route has a higher metric value, making it less preferred. The backup route will only be used if the primary route fails.

- **Metric Value**: By configuring a different metric (also called an administrative distance in some contexts) for the primary and backup routes, you ensure that the backup route only takes over if the primary route becomes unavailable.

**Other options explained:**

- **A. The administrator needs to configure different protocol priority values**: This is not applicable to static routes. Protocol priority values are used in dynamic routing protocols, not for static routes.

- **C. The administrator needs to configure different TAGs**: TAGs are not used for route prioritization in static routing. They are used in certain routing scenarios for other purposes.

- **D. The administrator only needs to configure two static routes**: Simply configuring two static routes is not enough. You must set different metric values to create a floating/static backup route mechanism.

Therefore, configuring different metric values is the correct method for implementing static floating routes....

No.# B. DHCP ACK

Here’s a brief overview of each DHCP message type:

DHCP DISCOVER: Sent by the client to discover available DHCP servers.
DHCP OFFER: Sent by the DHCP server to offer an IP address and other configuration parameters to the client.
DHCP REQUEST: Sent by the client to request the offered IP address and to accept the parameters offered by the DHCP server.
DHCP ACK: Sent by the DHCP server to confirm that the client can use the IP address and the configuration parameters.
Thus, the correct message for confirming that the host can use the IP address is DHCP ACK

No.# Let’s clarify the typical methods for adding Access Points (APs) to an Access Controller (AC):

A. Manually confirm APs in the uncertified list
This involves manually authorizing APs that have been detected by the AC but are not yet officially added. This is often necessary for security reasons.

B. Automatically discover AP
Many ACs support automatic discovery of APs. This feature allows the AC to identify and register APs that connect to the network without manual intervention.

C. Add online
This method refers to adding APs to the AC while they are actively connected and online. The AC can recognize and configure the APs through its management interface.

D. Import AP offline
Importing APs offline is not a standard method. APs generally need to be connected and online to be added and managed effectively.

Therefore, the correct methods are:

B. Automatically discover AP
C. Add online
A. Manually confirm APs in the uncertified list
Option D (Import AP offline) is generally not a standard method used for adding APs to an AC because it implies the APs are not actively connected, which is typically required for them to be managed and configured by the AC.

Thus, the most accurate choices would be A, B, and C...

No.# On Huawei ARG3 series routers, AAA (Authentication, Authorization, and Accounting) supports the following authentication modes:

A. **802.1x**
- **Correct**. 802.1x is a network access control protocol for securing networks by authenticating devices before they can connect.

B. **HWTACACS**
- **Correct**. HWTACACS (Huawei Terminal Access Controller Access Control System) is a protocol used for authentication, which is similar to TACACS+.

D. **Local**
- **Correct**. Local authentication uses a locally stored username and password database on the router itself.

C. **None**
- **Incorrect**. Selecting "None" would imply no authentication, which is not a supported mode when AAA is enabled.

Therefore, the correct answers are A, B, and D.

No.# On Huawei ARG3 series routers, AAA (Authentication, Authorization, and Accounting) supports the following authentication modes:

A. **802.1x**
- **Correct**. 802.1x is a network access control protocol for securing networks by authenticating devices before they can connect.

B. **HWTACACS**
- **Correct**. HWTACACS (Huawei Terminal Access Controller Access Control System) is a protocol used for authentication, which is similar to TACACS+.

D. **Local**
- **Correct**. Local authentication uses a locally stored username and password database on the router itself.

C. **None**
- **Incorrect**. Selecting "None" would imply no authentication, which is not a supported mode when AAA is enabled.

Therefore, the correct answers are A, B, and D.

No.# Correct answer should be B
B. **Reduce the number of equipment**

Router-on-a-stick is a method of inter-VLAN routing that uses a single physical interface on a router, which is configured with multiple sub-interfaces. Each sub-interface is associated with a specific VLAN, allowing the router to route traffic between the VLANs using one physical interface. This approach reduces the number of physical interfaces and potentially the number of routers needed, thus reducing equipment requirements.

Here's why the other options are not applicable:

- **A. Reduce the use of IP addresses**: The router-on-a-stick approach does not reduce the number of IP addresses used. Each VLAN still requires its own subnet and corresponding IP addresses.

- **C. Reduce the number of chain connections**: This option is not directly applicable as the router-on-a-stick approach involves configuring trunk connections rather than affecting chain connections.

- **D. Reduce routing table entries**: The router-on-a-stick method does not necessarily reduce routing table entries. Each VLAN requires its own routing entries....

No.# Correct answer is D
D. Have a clear grammatical structure, simple and easy to learn, colleagues run efficiently

This statement is incorrect. While Python is known for its readability and simplicity, it doesn't have a "grammatical structure" in the same way as natural languages. The term "colleagues run efficiently" is also unrelated to Python's characteristics.

The other options accurately describe Python's attributes.

No.# A. **False**

In the network layer (specifically in IPv4), the Protocol field indicates the type of transport layer protocol being used. For UDP (User Datagram Protocol), the value of the Protocol field is `17`.

The value `6` is used for TCP (Transmission Control Protocol). Therefore, if the transport layer protocol is UDP, the value of the network layer Protocol field is not `6`.

No.# Incorrect answer

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