RIB --> All the routing entry should be present in Routing Information Base(RIB) best path and second path ...

FIB --> only best path should be present in the Forwarding Information Base(FIB) ...

when the packet receive on Router it will check the FIB to forward the packets

Notes:

The FIB mirror much the RIB, however the concept enable to separate the forwarding plane function of the forwarding table from the control plane function of the routing table, therefore each function does not impact on the performance of the other.  

--> A is correct.

ENCOR 350-401 Official Cert Guide:

"Packet marking is a QoS mechanism that COLORS a packet by CHANGING a field within a packet or a frame header with a traffic descriptor so it is DISTINGUISHED from other packets during the application of other QoS mechanisms (such as re-marking, policing, queuing, or congestion avoidance)."

It can NOT be policing or either shaping. They are both QoS mechanisms. Marking is the distinction between a packet with qos and a packet with no qos. So best answer is marking.

CEF is mainly used to increase packet switching speed by reducing the overhead and delays introduced by other routing techniques.

CEF consists of two key components: The Forwarding Information Base (FIB) and adjacencies.

Notes:

1.The FIB is similar to the routing table generated by multiple routing protocols, maintaining only the next-hop address for a particular IP-route.

2.The adjacency table maintains layer 2 or switching information linked to a particular FIB entry, avoiding the need for an Address Resolution Protocol (ARP) request for each table lookup.

The difference between on-premise and cloud is essentially where this hardware and software resides.

On-premise means that a company keeps all of this IT environment onsite either managed by themselves or a third-party.

Cloud means that it is housed offsite with someone else responsible for monitoring and maintaining it.

During shaping phase, it uses queues to force some traffic to wait (buffered traffic) to avoid congestion

=> B is correct.

Traffic policing propagates bursts. When the traffic rate reaches the configured maximum rate (or committed information rate), excess traffic is dropped (or remarked). The result is an output rate that appears as a saw-tooth with crests and troughs.

Unlike traffic shaping, traffic policing does NOT cause delay.

Classification (which includes traffic policing, traffic shaping and queuing techniques) should take place at the network edge. It is recommended that classification occur as CLOSE TO THE SOURCE of the traffic as possible.

=> A,D is answer.

Orchestration plane (vBond) assists in securely onboarding the SD-WAN WAN Edge routers into the SD-WAN overlay. The vBond controller, or orchestrator, authenticates and authorizes the SD-WAN components onto the network. The vBond orchestrator takes an added responsibility to distribute the list of vSmart and vManage controller information to the WAN Edge routers. vBond is the only device in SD-WAN that requires a public IP address as it is the first point of contact and authentication for all SD-WAN components to join the SD-WAN fabric. All other components need to know the vBond IP or DNS information.

Fabric Roles & Terminology:

1.Control-Plane Nodes - Map System that manages Endpoint to Device relationships

2.Fabric Border Nodes - A Fabric device (e.g. Core) that connects External L3 network(s) to the SDA Fabric

3.Fabric Edge Nodes - A Fabric device (e.g. Access or Distribution) that connects Wired Endpoints to the SDA Fabric

4.Fabric Wireless Controller - A Fabric device (WLC) that connects APs and Wireless Endpoints to the SDA Fabric