Pass the Huawei HCIP-Datacom H12-821_V1.0 Questions and answers with CertsForce

Comprehensive and Detailed Step-by-Step Explanation:

BGP Router ID Behavior:

The router ID uniquely identifies a BGP device in the network.

If the router ID is changed, it is equivalent to creating a new BGP instance, and the existing BGP session is reset to establish a new peer relationship.

Impact of Router ID Change:

BGP peering relies on stable identifiers. Changing the router ID disrupts the TCP session and requires reestablishing the relationship.

Option A is false . When advertising a route to an IBGP peer, the BGP speaker does not modify the AS_Path. It simply advertises the route as-is , preserving the AS_Path learned from EBGP.

Clarification of the options:

B is correct: When a route is sent to an EBGP peer, the local AS is prepended to the AS_Path.

C is correct: The AS_Path begins with the local AS when a new route is advertised to an EBGP neighbor.

D is correct: IBGP does not modify AS_Path when passing routes within the same AS.

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

“BGP speakers prepend their AS number to the AS_Path only when advertising to EBGP peers. IBGP peers do not alter the AS_Path.”

(Chapter: BGP Path Attributes – Section: AS_Path)

The virtual MAC address for a VRRP virtual router is determined by the formula 00-00-5E-00-01-[VRID in hexadecimal] . For VRID 3, the hexadecimal equivalent is 03 . Thus, the virtual MAC address is 00-00-5E-00-01-03 ​.

Comprehensive and Detailed Step-by-Step Explanation:

1. Port Priority in RSTP:

RSTP (Rapid Spanning Tree Protocol) elects root and designated ports based on port priority and port ID.

Port priority is a configurable value that helps determine which port becomes the root or designated port when multiple ports are eligible.

The port ID consists of the port priority and port number. When priorities are equal, the port number is used as a tiebreaker.

2. Default Port Priority on Huawei Switches:

On Huawei switches, the default port priority is 128 .

This value can be adjusted in increments of 16 using the command stp port priority.

3. Analysis of Options:

Option A: 1

Incorrect . This is not the default port priority value.

Option B: 128

Correct . This is the default port priority value on Huawei switches.

Option C: 4096

Incorrect . This is not a valid default port priority value.

Option D: 32768

Incorrect . This is the default bridge priority, not the port priority.

4. Summary:

The default port priority on Huawei switches is 128 .

Comprehensive and Detailed In-Depth Explanation:

VRRP (Virtual Router Redundancy Protocol) HSB (Hot Standby Backup) mode ensures high availability for WLAN access controllers (ACs) .

A. FALSE → The default VRRP priority is 100 , but a higher value (not smaller) means a higher priority .

B. TRUE → The VRID (Virtual Router Identifier) must be the same on both master and backup ACs .

C. TRUE → The virtual IP address must match for seamless failover.

D. FALSE → The default VRRP advertisement interval is 1 second . However, this statement is false because the context suggests an incorrect assumption about configurability .

???? Reference: Huawei HCIA-Datacom Study Guide, VRRP in WLAN Deployments.

Comprehensive and Detailed Step-by-Step Explanation:

Switch Stack Overview:

In a switch stack, roles are assigned as master , standby , and slave .

The master handles configuration and control, while the standby serves as the backup master.

Behavior During Master Restart:

D: If the master switch restarts, the standby switch immediately takes over as the new master.

B: After the original master switch restarts, it becomes the master again (default behavior).

Incorrect Options:

A: The slave switch is not promoted to standby before the master switch restart completes.

C: The original standby switch remains the master after the restart.

The operator between if-match clauses under a node is AND, meaning all conditions must be satisfied. However, the operator between nodes is OR, meaning a route matching any node will pass the route-policy ​.