Cisco 350-401 Online Practice Questions and Exam Preparation

Cisco 350-401 Online Questions & Answers

• Question 661:

  What is the function of the statement "import actions" in this script?

  Import actions

  if process == 'http':

  actions.http(site)

  A. It imports the functions that are not available natively in Python
  B. It imports the functions of a third-party module
  C. It imports a Python module
  D. It imports an external reference
  C. It imports a Python module

• Question 662:

  Which protocol is implemented to establish secure control plane adjacencies between Cisco SD-WAN nodes?

  A. IKE
  B. TLS
  C. IPsec
  D. ESP
  B. TLS

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  Explanation

  The Cisco SD-WAN control plane has been designed with network and device security in mind. The foundation of the control plane is one of two security protocols derived from SSL (Secure Sockets Layer)-the Datagram Transport Layer Security (DTLS) protocol and the Transport Layer Security (TLS) protocol.

  References:

  https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/security/vedge/securitybook/security-overvi

• Question 663:

  How does CEF switching differ from process switching on Cisco devices?

  A. CEF switching saves memory by sorting adjacency tables in dedicate memory on the line cards, and process switching stores all tables in the main memory
  B. CEF switching uses adjacency tables built by the CDP protocol, and process switching uses the routing table
  C. CEF switching uses dedicated hardware processors, and process switching uses the main processor
  D. CEF switching uses proprietary protocol based on IS-IS for MAC address lookup, and process switching uses in MAC address table
  B. CEF switching uses adjacency tables built by the CDP protocol, and process switching uses the routing table

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  Explanation

  Cisco Express Forwarding (CEF) switching is a proprietary form of scalable switching intended to tackle the problems associated with demand caching. With CEF switching, the information which is conventionally stored in a route cache is split up over several data structures. The CEF code is able to maintain these data structures in the Gigabit Route Processor (GRP), and also in slave processors such as the line cards in the 12000 routers. The data structures that provide optimized lookup for efficient packet forwarding include:

  1. The Forwarding Information Base (FIB) table - CEF uses a FIB to make IP destination prefix-based switching decisions. The FIB is conceptually similar to a routing table or information base. It maintains a mirror image of the forwarding information contained in the IP routing table. When routing or topology changes occur in the network, the IP routing table is updated, and these changes are reflected in the FIB. The FIB maintains next-hop address information based on the information in the IP routing table.

  2. Because there is a one-to-one correlation between FIB entries and routing table entries, the FIB contains all known routes and eliminates the need for route cache maintenance that is associated with switching paths such as fast switching and optimum switching.

  3. Adjacency table - Nodes in the network are said to be adjacent if they can reach each other with a single hop across a link layer. In addition to the FIB, CEF uses adjacency tables to prepend Layer 2 addressing information. The adjacency table maintains Layer 2 next-hop addresses for all FIB entries.

  CEF can be enabled in one of two modes:

  1. Central CEF mode - When CEF mode is enabled, the CEF FIB and adjacency tables reside on the route processor, and the route processor performs the express forwarding. You can use CEF mode when line cards are not available for CEF switching, or when you need to use features not compatible with distributed CEF switching.

  2. Distributed CEF (dCEF) mode - When dCEF is enabled, line cards maintain identical copies of the FIB and adjacency tables. The line cards can perform the express forwarding by themselves, relieving the main processor - Gigabit Route Processor (GRP) - of involvement in the switching operation. This is the only switching method available on the Cisco 12000 Series Router.

  CEF uses an Inter-Process Communication (IPC) mechanism to ensure synchronization of FIBs and adjacency tables on the route processor and line cards.

  For more information about CEF switching, see Cisco Express Forwarding (CEF) White Paper.

• Question 664:

  What is the function of the fabric control plane node In a Cisco SD-Access deployment?

  A. It is responsible for policy application and network segmentation in the fabric.
  B. It performs traffic encapsulation and security profiles enforcement in the fabric.
  C. It holds a comprehensive database that tracks endpoints and networks in the fabric.
  D. It provides Integration with legacy nonfabric-enabled environments.
  C. It holds a comprehensive database that tracks endpoints and networks in the fabric.

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  Explanation

  Fabric control plane node (C): One or more network elements that implement the LISP Map-Server (MS) and Map-Resolver (MR) functionality. The control plane node`s host tracking database keep track of all endpoints in a fabric site and associates the endpoints to fabric nodes in what is known as an EID-to-RLOC binding in LISP.

  References:

  https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-macro-segmentation-deploy-guide.html

• Question 665:

  In which way are EIGRP and OSPF similar?

  A. Both protocols support autosummarization.
  B. Both protocols use hello packets to discover neighbors.
  C. Both protocols support unequal-cost load balancing.
  D. Both protocols send updates using unicast addresses.
  B. Both protocols use hello packets to discover neighbors.

• Question 666:

  What is a benefit of using a Type 2 hypervisor instead of a Type 1 hypervisor?

  A. better application performance
  B. Improved security because the underlying OS is eliminated
  C. Improved density and scalability
  D. ability to operate on hardware that is running other OSs
  D. ability to operate on hardware that is running other OSs

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  Explanation

  There are two types of hypervisors: type 1 and type 2 hypervisor.

  In type 1 hypervisor (or native hypervisor), the hypervisor is installed directly on the physical server.

  Then instances of an operating system (OS) are installed on the hypervisor. Type 1 hypervisor has direct access to the hardware resources. Therefore they are more efficient than hosted architectures.

  Some examples of type 1 hypervisor are VMware vSphere/ESXi, Oracle VM Server, KVM and Microsoft Hyper-V.

  In contrast to type 1 hypervisor, a type 2 hypervisor (or hosted hypervisor) runs on top of an operating system and not the physical hardware directly. A big advantage of Type 2 hypervisors is that management console software is not required.

  Examples of type 2 hypervisor are VMware Workstation (which can run on Windows, Mac and Linux) or Microsoft Virtual PC (only runs on Windows). Type 1 is more efficient and well performing, it is also more secure than type 2 because the flaws and vulnerabilities that are endemic to Operating Systems are often absent from Type 1, bare metal hypervisors.

  Type 1 has better performance, scalability and stability but supported by limited hardware.

• Question 667:

  Refer to the exhibit.

  

  A POST /discovery request spawns an asynchronous task. After querying for more information about the task, the Cisco DNA Center platform returns the REST API response.

  What is the status of the discovery task?

  A. restarted
  B. failed
  C. stopped
  D. successful
  D. successful

• Question 668:

  DRAG DROP

  Drag and drop the characteristics from the left onto the orchestration tools that they describe on the right.

  Select and Place:

  

  

• Question 669:

  Which NTP mode must be activated when using a Cisco router as an NTP authoritative server?

  A. primary
  B. server
  C. broadcast client
  D. peer
  B. server

• Question 670:

  Which Python snippet should be used to store the devices data structure in a JSON file?

  

  

  A. Option A
  B. Option B
  C. Option C
  D. Option D
  C. Option C

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  Explanation

  the same configuration can be found in multiple examples here: reference:

  https://www.section.io/engineering-education/storing-data-in-python-using-json-module/