H12-821_V1.0 Probesfragen & H12-821_V1.0 Antworten

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Huawei H12-821_V1.0 Exam Syllabus Topics:

Section	Weight	Objectives
Network Reliability	7%	- VRRP protocol - Device redundancy and link backup - BFD technology
Ethernet Switching Technologies	7%	- VLAN principles and configuration - Spanning Tree Protocol - Link aggregation and stack technology
Multicast Technologies	9%	- IGMP protocol - PIM protocol - Multicast basic concepts
IPv6 Technologies	3%	- IPv6 address structure and configuration - IPv6 routing protocols
OSPF Fundamentals	16%	- OSPF special applications and troubleshooting - OSPF configuration and optimization - OSPF principles and operation mechanisms
IS-IS Fundamentals	8%	- IS-IS protocol principles - IS-IS configuration and deployment
Network Service and Management	5%	- Network management and monitoring - DHCP and DNS services
Routing Basics	3%	- Routing concepts and classification - Routing table composition and selection rules
Network Security	8%	- ACL and packet filtering - AAA authentication - Attack defense and security policy
BGP Fundamentals	17%	- BGP route attributes and selection - BGP configuration and policy application - BGP characteristics and working principles
Network Solutions and Design	5%	- Typical network architecture and solution - Enterprise network design principles
WLAN Basics	2%	- WLAN technology principles - WLAN deployment and optimization
Routing and Traffic Control	10%	- Route import and redistribution - Policy-based routing - Routing policy and filtering

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Huawei HCIP-Datacom-Core Technology V1.0 H12-821_V1.0 Prüfungsfragen mit Lösungen (Q381-Q386):

381. Frage
Preferences of routing protocols determine the sequence In which a router selects a route among routes to the same destination /earned through different routing protocols.

A. FALSE
B. TRUE

Antwort: A

382. Frage
What types of metrics does the IS-IS protocol support? (Multiple choice)

A. wide
B. Tos
C. default
D. Narrow

Antwort: A,D

383. Frage
BGP confederations are widely used because they can reduce the number of IBGP connections in an AS.
Which of the following statements is false about confederations?

A. After a confederation is configured, the original IBGP attributes can be retained.
B. A confederation divides an AS into several sub-ASs, and EBGP full-mesh connections are established in each sub-AS.
C. After a confederation is configured, the original AS number is used as the confederation ID of each router.
D. The ASs outside a confederation still consider the confederation as one AS.

Antwort: B

Begründung:
Comprehensive and Detailed in-depth Step-by-Step Explanation:BGP confederations are used to reduce the complexity of IBGP full-mesh connections within a large AS by dividing the AS into multiple sub-ASs (called "member ASs") while still appearing as a single AS to external ASs. Below is an analysis of each option:
* A. The ASs outside a confederation still consider the confederation as one AS:
* This is true. Externally, the entire confederation is seen as a single AS, identified by the main AS number.
* B. After a confederation is configured, the original IBGP attributes can be retained:
* This is true. The configuration of a confederation does not affect the IBGP attributes exchanged between routers.
* C. After a confederation is configured, the original AS number is used as the confederation ID of each router:
* This is true. The main AS number is used as the Confederation Identifier for all member ASs in the confederation.
* D. A confederation divides an AS into several sub-ASs, and EBGP full-mesh connections are established in each sub-AS:
* This is false. Within each sub-AS of a confederation, IBGP connections are still used (not EBGP). Confederations are designed to reduce the number of IBGP full-mesh connections required within a large AS by creating smaller, manageable sub-ASs.
Therefore, the correct answer is D.
References:
* Huawei HCIA-Datacom Study Guide, Chapter on "BGP Confederations".
* RFC 5065 - Autonomous System Confederations for BGP.

384. Frage
IGMP Snooping runs at the data link layer and is used to manage and control multicast groups, and solves the problem of multicast packets being broadcast on Layer 3.

A. FALSE
B. TRUE

Antwort: A

385. Frage
IP multicast effectively conserves network bandwidth and reduces network load. Therefore, it is widely used in network services, such as IPTV, real-time data transmission, and multimedia conferencing.

A. FALSE
B. TRUE

Antwort: B

Begründung:
Comprehensive and Detailed Step-by-Step Explanation:
1. Overview of IP Multicast:
IP multicast is a method of delivering data from one source to multiple destinations simultaneously.
Unlike unicast (one-to-one communication) or broadcast (one-to-all communication), multicast isone-to- many, allowing data to be sent only to subscribers (multicast group members).
This significantly conserves bandwidth and reduces the load on the network because the source only sends a single stream of data, which is replicated by multicast routers as needed.
2. Use Cases for IP Multicast:
IP multicast is widely used in network services that involve real-time or large-scale data delivery, such as:
IPTV (Internet Protocol Television):Broadcasting live TV streams.
Real-Time Data Transmission:Delivering stock market data, sensor updates, etc.
Multimedia Conferencing:Supporting group calls, webinars, and online meetings.
3. Why the Statement is TRUE:
IP multicast reduces unnecessary traffic and maximizes efficiency, making it ideal for these types of network services.
Reference:
Huawei HCIA-Datacom Study Guide, Chapter "Multicast Basics."
RFC 1112: Host Extensions for IP Multicasting.

386. Frage
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