H12-831_V1.0 Reviews Questions

Multiprotocol BGP (MP-BGP) extends traditional BGP to support IPv6 routing information through multiprotocol path attributes.

The MP_REACH_NLRI attribute carries reachable network prefixes and their associated next-hop information. For IPv6 unicast routes, it normally includes the IPv6 global unicast address of the next-hop router.

In the topology, R1 belongs to AS 65001 and uses Loopback0 with IPv6 address 2000::1/128 to establish its EBGP relationship with R2 in AS 65002.

R1 imports the prefix 2001::1/128 into BGP and advertises it to R2. Because the EBGP session uses R1 ' s loopback address, the advertised IPv6 next hop is 2000::1.

The destination prefix and next-hop address serve different functions: 2001::1/128 identifies the reachable destination, while 2000::1 identifies the forwarding next hop.

Therefore, the statement is TRUE.

HCIP-Datacom-Advanced Routing & Switching Technology V1.0 Training Material.pdf

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This statement is false. Time zone configuration using the clock timezone command affects only the local display of time on a device (e.g., logs, timestamps), and has no effect on dynamic routing protocol operation.

OSPF, BGP, IS-IS, and other routing protocols do not rely on time synchronization or time zone matching between devices to establish neighbor relationships.

Even if devices are in different time zones, they can still form adjacencies as long as IP connectivity and protocol parameters (e.g., hello/dead intervals, authentication) are correctly configured.

✅ Official Reference from Huawei:

" The clock timezone command sets the local time zone for display purposes. It does not affect protocol operations or neighbor relationships. "

— [Huawei HCIA-Datacom Certification Guide – System Management Section]

Comprehensive and Detailed In-Depth Explanation:

To verify the correct answer, we need to analyze Bidirectional Forwarding Detection (BFD) behavior and the provided configuration.

1. Understanding BFD Configuration Parameters

BFD (Bidirectional Forwarding Detection) is a protocol used for fast failure detection between directly connected devices.

Key Configuration Parameters in BFD:

Peer IP (bind peer-ip)

This specifies the destination router’s IP address for the BFD session.

✅ Correctly configured on both R1 and R2.

Discriminator Local/Remote (discriminator local X / remote Y)

These values must match between the two routers.

✅ Correctly configured (R1: local 1, remote 2; R2: local 2, remote 1).

Min-TX Interval (min-tx-interval)

Defines the minimum transmit interval for BFD packets.

❌ Missing from R2’s configuration (could be a cause for mismatch).

Min-RX Interval (min-rx-interval)

Defines the minimum receive interval for BFD packets.

❌ Missing from R2’s configuration (could be a cause for mismatch).

2. Analyzing the Configuration on R1 and R2

✅ Configuration on R1 (Correct)

shell

CopyEdit

bfd tor2 bind peer-ip 10.0.12.2

discriminator local 1

discriminator remote 2

min-tx-interval 1500

min-rx-interval 1500

This configuration is correct.

❌ Configuration on R2 (Incomplete)

shell

CopyEdit

bfd tor1 bind peer-ip 10.0.12.1

discriminator local 2

discriminator remote 1

Missing min-tx-interval and min-rx-interval.

3. Why the Answer is FALSE?

A BFD session does NOT go down due to mismatched timing parameters.

BFD dynamically negotiates timing values, meaning even if R2 is missing min-tx/min-rx values, the session should still establish.

However, the session will fail if the peer IP or discriminator values are incorrect (which they are NOT in this case).

The actual cause of failure in this case is likely the missing min-tx and min-rx settings on R2, NOT a mismatch between R1 and R2.