Huawei H12-891_V1.0 Exam With Confidence Using Practice Dumps

Huawei Open Programmability System (OPS) is a programmable network architecture that uses RESTful APIs. In RESTful operations:

GET → Retrieve data

PUT → Configure/replace the value of a managed object

POST → Create new resources or perform non-idempotent operations

PATCH → Partially update a resource

When configuring or updating the value of a managed object (fully replacing it), PUT is the correct method.

Exact Extract – Huawei OPS and RESTful API Guide:

“The PUT method is used to configure the value of a managed object, replacing the entire object if it exists.”

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.

In MPLS (Multiprotocol Label Switching), Label Switching Routers (LSRs) handle packets based on FECs (Forwarding Equivalence Classes) and their positions in the label-switched path:

Ingress LSR: The entry point for labeled packets; it classifies packets into FECs and assigns the initial label.

Transit LSR: Intermediate routers that swap labels and forward packets along the LSP.

Egress LSR: The last router in the LSP that removes the label and forwards the packet normally.

An LSR cannot be both an ingress and a transit router for the same FEC, because an ingress LSR is defined as the starting point for that specific FEC ' s LSP. If it’s the ingress, it means the labeled path starts there, so it can ' t be in the middle (transit) of that same path.

Therefore, the statement is FALSE.