Huawei Updated H12-821_V1.0 Exam Questions and Answers by mimi

Comprehensive and Detailed in-depth Step-by-Step Explanation:The Network Entity Title (NET) is a unique identifier assigned to an IS-IS router. It is derived from the Network Service Access Point (NSAP) address and consists of the following components:

Area Address:

Identifies the area in which the router resides.

Multiple routers in the same IS-IS area must have the same area address.

System ID:

Uniquely identifies the router within the IS-IS area.

The System ID is typically derived from the router's loopback IP address or another unique value.

SEL (Selector Field):

The SEL field is always set to 00 for IS-IS NETs.

The NET is used by IS-IS for route calculation and to identify the router within the IS-IS domain. Therefore, the statement is TRUE.

References:

Huawei HCIA-Datacom Study Guide, Chapter on "IS-IS Addressing".

RFC 1195 – Use of OSI IS-IS for Routing in TCP/IP and Dual Environments.

Comprehensive and Detailed Step-by-Step Explanation:

HSB (Hot Standby Backup) Service:

HSB is used on WLAN controllers to back up critical information in real time to a backup device, ensuring service continuity in case of failures.

Backed-Up Information:

CAPWAP Tunnel Information (A): Essential for maintaining connections between APs and controllers.

AP Entries (C): Information about connected APs is backed up.

User Data Information (D): Includes client authentication and session details.

Incorrect Option:

DHCP Address Information (B): Not part of HSB's responsibilities, as DHCP is handled separately.

References:

HCIA-Datacom Study Guide, Chapter: WLAN Redundancy with HSB

Huawei HSB Configuration Guide

When OSPF routers have interfaces on different network segments with different subnet masks, the network type can be adjusted to establish adjacency. A point-to-point (P2P) network type eliminates the requirement for matching subnet masks by treating the link as directly connected without intermediate devices.

P2P Network Characteristics

OSPF treats the link as a direct connection between two routers.

No DR/BDR election occurs, simplifying adjacency establishment.

Subnet mask differences do not hinder neighbor relationships as the link is viewed as a logical tunnel.

HCIP-Datacom-Core Reference

The OSPF configuration section explicitly mentions P2P as a suitable network type for resolving adjacency issues caused by mismatched subnet masks​​.

In the PIM protocol, Register Stop and Graft messages are sent with unicast destination addresses, typically to specific neighbors or RP (Rendezvous Point) routers. Other messages like Bootstrap and Assert use multicast addresses for broader dissemination across the network ​.