H12-821_V1.0 Exam Dumps - Huawei HCIP-Datacom Questions and Answers

The prefix list permits the prefix 1.1.1.1/24 with a mask length greater than or equal to /26 and less than or equal to /32 . This means only prefixes with the base 1.1.1.1 and mask lengths between /26 and /32 will be permitted. Routes like 1.1.1.2/16 and 1.1.1.1/24 do not meet the mask length criteria, so they will be denied. Conversely, routes like 1.1.1.1/26 and 1.1.1.1/32 satisfy the condition and will be permitted ​.

Comprehensive and Detailed In-Depth Explanation:

BGP uses TCP (not UDP) on port 179 to establish peer relationships.

Peer IP must be routable in both IBGP and EBGP , but BGP does not use UDP connections .

The statement is false because of the incorrect mention of UDP .

???? Reference: Huawei HCIA-Datacom Study Guide, BGP Session Establishment and TCP Usage.

Comprehensive and Detailed In-Depth Explanation:

Wireless LAN (WLAN) roaming allows mobile devices (STAs) to move seamlessly between different APs without dropping connections .

Types of WLAN Roaming:

Layer 2 roaming → STAs move between APs in the same subnet without IP address changes.

Layer 3 roaming → STAs move across different subnets , requiring IP address reconfiguration (handled via DHCP or tunneling).

Since roaming prevents service interruption in large WLAN deployments, the statement is true .

???? Reference: Huawei HCIA-Datacom Study Guide, WLAN Roaming and Seamless Connectivity.

 ACL in Routing Policies

ACLs are frequently used in routing policies to match specific routes based on criteria such as source IP, destination IP, and more. This allows ACLs to influence route redistribution, filtering, and forwarding decisions.

 HCIP-Datacom-Core Reference

ACL applications in routing policies are discussed in the routing policy chapters​​.

A is true – MAC authentication often uses PAP or CHAP for basic password exchange.

B is false – By default , both the username and password are set to the full MAC address of the terminal, not just the last 6 digits.

C is true – MAC authentication is transparent to the user and requires no client software on the terminal.

D is true – The authentication system includes:

Terminal (user device),

Access device (AP or switch), and

Authentication server (e.g., RADIUS).

Reference from Huawei HCIP-Datacom-Core Technology Study Guide:

“MAC authentication does not require client-side software. By default, both the user name and password are the complete MAC address in lowercase without delimiters.”

(Chapter: WLAN Security – Section: MAC Authentication Mechanism)

Comprehensive and Detailed Step-by-Step Explanation:

1. What is NETCONF?

NETCONF (Network Configuration Protocol) is an XML-based protocol used for network device configuration and management.

It enables reading, modifying, deleting, and restoring configurations programmatically.

2. Supported Operations:

Option A: Modifying configurations

Correct.

NETCONF allows you to modify existing configurations on network devices.

Option B: Deleting configurations

Correct.

Configurations can be deleted using NETCONF operations.

Option C: Restoring configurations

Correct.

NETCONF can restore configurations by applying previously saved configuration data.

Option D: Backing up configurations

Correct.

NETCONF can retrieve and save the current configuration as a backup.

3. Summary:

NETCONF supports all listed operations: modifying, deleting, restoring, and backing up configurations.

 DIS and DR Election

The IS-IS Designated Intermediate System (DIS) is responsible for generating and updating pseudonode LSPs on a broadcast network.

Unlike OSPF DR, the IS-IS DIS does not preempt by default. This behavior avoids unnecessary flapping in the network due to frequent DIS re-elections.

 HCIP-Datacom-Core Reference

The characteristics of DIS and DR behavior are explained in IS-IS network operation chapters​​.

Comprehensive and Detailed Step-by-Step Explanation:

BGP ConnectRetry Timer:

The ConnectRetry timer is used when establishing a TCP connection between BGP peers.

If the connection is successful, the timer is disabled.

If the connection fails, the timer restarts, and the router attempts to reconnect after the timer expires.

Behavior:

This timer prevents excessive connection attempts and ensures efficient resource utilization.

Routing policies are used to control how routes are imported, advertised, or received. Policy-Based Routing (PBR) is used to forward packets based on policies, bypassing the routing table. Routing policies are not used for packet forwarding ​.

Comprehensive and Detailed Step-by-Step Explanation:

Route Policy Overview:

A route-policy is a policy-based routing tool that filters and modifies routing information.

It consists of one or more nodes , and each node can specify match conditions and apply actions to routes.

Maximum Number of Nodes:

The maximum number of nodes supported in a route-policy is 1024 , allowing flexibility in route filtering and control.