H12-891_V1.0 Exam Dumps : HCIE-Datacom V1.0

The MPLS header consists of:

Label (20 bits) – Label value used for forwarding.

EXP (3 bits) – QoS field (Class of Service).

S bit (1 bit) – Bottom-of-Stack indicator.

TTL (8 bits) – Time-to-Live, similar to the TTL field in the IP header.

Function of TTL in MPLS:

It is used to prevent infinite loops.

Every LSR decrements the TTL by 1.

When TTL reaches 0, the packet is discarded.

This mirrors the behavior of IP TTL and ensures loop prevention in MPLS networks.

Correct answer: D. This field is used to prevent packet forwarding loops, similar to the TTL field in an IP header.

The free mobility solution in Huawei iMaster NCE-Campus allows:

Centralized policy management via the controller

Security group-based policies, decoupled from IPs/VLANs

Automatic policy delivery, no need to configure repeatedly per device

Dynamic mapping of users and IPs via security group subscriptions

Exact Extract - Huawei iMaster NCE-Campus Solution White Paper:

“Free mobility uses security groups and centralized control to enable consistent policy enforcement, avoiding repetitive configurations and simplifying policy management.”

Comprehensive and Detailed In-Depth Explanation:

OSPFv3, which supports IPv6, uses a router ID that is 32 bits in length, similar to OSPFv2. The router ID in OSPF is always a 32-bit number, typically represented in an IPv4 address format (dotted decimal). Although OSPFv3 is designed to support IPv6, it still relies on a 32-bit router ID for identification, which must be unique within an OSPF domain. The router ID does not change even though the protocol itself supports IPv6 addresses (128 bits).