Implementing Cisco Enterprise Network Core Technologies (ENCOR)

Here you have the best Cisco 350-401 practice exam questions

You have 1066 total questions to study from
Each page has 5 questions, making a total of 214 pages
You can navigate through the pages using the buttons at the bottom
This questions were last updated on November 15, 2025
This site is not affiliated with or endorsed by Cisco.

Question 1 of 1066

What is the difference between a RIB and a FIB?

The FIB is populated based on RIB content.

The RIB maintains a mirror image of the FIB.

The RIB is used to make IP source prefix-based switching decisions.

The FIB is where all IP routing information is stored.

Correct Answer: A

The difference between a RIB and a FIB lies in their functions and the type of information they handle. The Routing Information Base (RIB) is essentially the routing table where all routing information, including multiple possible routes and routing metrics, is stored. On the other hand, the Forwarding Information Base (FIB) is a more streamlined structure used by the router to make actual packet forwarding decisions. The FIB is populated based on the information contained in the RIB, selecting the best routes decided by the routing algorithms. Thus, the FIB is derived from the RIB, and this forms the core distinction between the two.

Question 2 of 1066

Which QoS component alters a packet to change the way that traffic is treated in the network?

policing

classification

marking

shaping

Correct Answer: C

Marking is the QoS component that alters bits in the packet header to indicate its priority level or other attributes. This alteration allows network devices to treat the packet according to its assigned priority, thereby changing the way the traffic is handled within the network. Policing, classification, and shaping, while important QoS components, do not directly alter the packet itself to achieve this. Policing controls the rate of traffic, classification identifies traffic types, and shaping smooths traffic flows, but none of these directly modify the packet to influence its treatment like marking does.

Question 3 of 1066

DRAG DROP -
Drag and drop the descriptions from the left onto the correct QoS components on the right.
Select and Place:
Exam 350-401: Question 3 - Image 1

Correct Answer:

Question 4 of 1066

Which statement about Cisco Express Forwarding is true?

The CPU of a router becomes directly involved with packet-switching decisions.

It uses a fast cache that is maintained in a router data plane.

It maintains two tables in the data plane: the FIB and adjacency table.

It makes forwarding decisions by a process that is scheduled through the IOS scheduler.

Correct Answer: C

Cisco Express Forwarding (CEF) maintains two tables in the data plane: the Forwarding Information Base (FIB) and the adjacency table. The FIB is used to make IP destination prefix-based switching decisions, while the adjacency table maintains the layer 2 next-hop information necessary for packet forwarding. This design allows CEF to improve the efficiency and speed of packet forwarding by pre-computing the necessary information and storing it in these tables.

Question 5 of 1066

What is a benefit of deploying an on-premises infrastructure versus a cloud infrastructure deployment?

ability to quickly increase compute power without the need to install additional hardware

less power and cooling resources needed to run infrastructure on-premises

faster deployment times because additional infrastructure does not need to be purchased

lower latency between systems that are physically located near each other

Correct Answer: D

A benefit of deploying an on-premises infrastructure versus a cloud infrastructure deployment is lower latency between systems that are physically located near each other. This is because data does not need to travel over the internet, reducing delays and improving communication speed between systems.