350-401 practice questions 461–470

1. Question 461 · 1003 in bank

   Select 2

   What are two characteristics of VXLAN? (Choose two)

   • AIt lacks support for host mobility.
   • BIt uses VTEPs to encapsulate and decapsulate frames.
   • CIt allows for up to 16 million VXLAN segments.
   • DIt extends Layer 2 and Layer 3 overlay networks over a Layer 2 underlay.
   • EIt has a 12-bit network identifier.

   Show answer

   Answer: BC

   Explanation

   Virtual eXtensible Local Area Network (VXLAN) is a tunneling protocol that tunnels Ethernet (layer 2) traffic over an IP (layer 3) network. Traditional layer 2 networks have issues because of three main reasons: Spanning-tree. Limited amount of VLANs. Large MAC address tables. Spanning-tree blocks any redundant links to avoid loops The GRE tunnel runs on top of a physical underlay network. With VXLAN, the overlay is a layer 2 Ethernet network. The underlay network is a layer 3 IP network. Another name for the underlay network is a transport network. The underlay network is simple; its only job is to get packets from A to B.

   Source: Adapted from community discussion — diamant

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2. Question 462 · 1003 in bank

   

   Refer to the exhibit. An engineer configures OSPF and wants to verify the configuration. Which configuration is applied to this device?

   • AR1(config)#interface Gi0/1 R1(config-if)#ip ospf enable R1(contig-if)#ip ospf network broadcast R1(config-if)#no shutdown
   • BR1(config)#router ospf 1 R1(config-router)#network 0.0.0.0 0.0.0.0 area 0 R1(config-router)#no passive-interface Gi0/1
   • CR1(config)#interface Gi0/1 R1(config-if)#ip ospf 1 area 0 R1(config-if)#no shutdown
   • DR1(config)#router ospf 1 R1(config-router)#network 192.168.50.0 0.0.0.255 area 0

   Show answer

   Answer: C

   Explanation

   cisco_R3#show ip ospf interface ethernet 0/0.50 Ethernet0/0.50 is up, line protocol is up Internet Address 10.111.10.1/30, Area 22, Attached via Interface Enable <<<<<<<<<<<<< Process ID 1, Router ID 3.3.3.3, Network Type POINT_TO_POINT, Cost: 10 Topology-MTID Cost Disabled Shutdown Topology Name 0 10 no no Base Enabled by interface config, including secondary ip addresses Transmit Delay is 1 sec, State POINT_TO_POINT Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 oob-resync timeout 40 Hello due in 00:00:00 Supports Link-local Signaling (LLS) Cisco NSF helper support enabled IETF NSF helper support enabled Index 1/1/1, flood queue length 0 Next 0x0(0)/0x0(0)/0x0(0) Last flood scan length is 5, maximum is 6 Last flood scan time is 0 msec, maximum is 0 msec Neighbor Count is 1, Adjacent neighbor count is 1 Adjacent with neighbor 5.5.5.5 Suppress hello for 0 neighbor(s) cisco_R3#

   Source: Adapted from community discussion — nushadu

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3. Question 463 · 1003 in bank

   What is the function of a control-plane node in a Cisco SD-Access solution?

   • Ato run a mapping system that manages endpoint to network device relationships
   • Bto implement policies and communicate with networks outside the fabric
   • Cto connect external Layer 3 networks to the SD-Access fabric
   • Dto connect APs and wireless endpoints to the SD-Access fabric

   Show answer

   Answer: A

   Explanation

   The SD-Access fabric control plane node is based on the LISP Map-Server and Map-Resolver functionality combined on the same node. The control plane node’s database tracks all endpoints in the fabric site and associates the endpoints to fabric nodes, decoupling the endpoint IP address or MAC address from the location (closest router) in the network.

   Source: Adapted from community discussion — slacker_at_work

   References

   • Cisco documentation

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4. Question 464 · 1003 in bank

   What is the purpose of a data modeling language?

   • Ato describe the structure and meaning of exchanged data
   • Bto standardize the procedures that are executed when parsing sent and received data
   • Cto establish a framework to process data by using an object-oriented programming approach
   • Dto specify the rules for transcoding between text and binary data encodings

   Show answer

   Answer: A

   Explanation

   Data models can be implemented using numerous data representation and storage formats, including arrays, linked lists, stacks, and graphs (e.g hierarchical trees). The hierarchical tree is very efficient in representing repetitive and hierarchical data and is typically associated with routing or switching platform configurations. Therefore it is the most common data model format used for networking platforms. (Source: https://developer.cisco.com/docs/nx-os/#!the-nature-of-data-models)

   Source: Adapted from community discussion — Rose66

   References

   • cisco.com documentation
   • cisco.com documentation

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5. Question 465 · 1003 in bank

   Which IPv4 packet field carries the QoS IP classification marking?

   • AID
   • BTTL
   • CFCS
   • DToS

   Show answer

   Answer: D

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6. Question 466 · 1003 in bank

   Select 2

   Which two solutions are used for backing up a Cisco DNA Center Assurance database? (Choose two.)

   • Abare metal server
   • Bremote server
   • CNFS share
   • Dlocal server
   • Enon-linux server

   Show answer

   Answer: BC

   Explanation

   B,C Cisco DNA Center creates the backup files and posts them to a remote server. Each backup is uniquely stored using the UUID as the directory name.To support Assurance data backups, the server must be a Linux-based NFS server that meets the following requirements: - Support NFS v4 and NFS v3. - Cisco DNA Center stores backup copies of Assurance data on an external NFS device and automation data on an external remote sync (rsync) target location. - The remote share for backing up an Assurance database (NDP) must be an NFS share.

   Source: Adapted from community discussion — kebkim

   References

   • cisco.com documentation
   • Cisco documentation

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7. Question 467 · 1003 in bank

   

   Refer to the exhibit. Communication between R2 and R3 over FastEthenet1/1 falls. What is the root cause of the failure?

   • AThe subnet mask is different between the two interfaces.
   • BThe interface of R3 is not operational.
   • CThe wrong type of cable is connected between the two interfaces.
   • DIP CEF is disabled on R3.

   Show answer

   Answer: A

   Explanation

   Provided answer is correct. I tested this in GNS3. Kept the subnet mask on one side /30 and the other side /29. Got on one side debug outputs: *Sep 8 22:58:38.295: IP ARP req filtered src 10.10.12.1 ca01.37c4.0000, dst 10.10.12.5 0000.0000.0000 wrong cable, interface FastEthernet0/0 And the other side: *Sep 8 22:58:37.747: IP ARP: creating incomplete entry for IP address: 10.10.12.5 interface FastEthernet0/0 The output with wrong cable is misleading.

   Source: Adapted from community discussion — Deu_Inder

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8. Question 468 · 1003 in bank

   What is one characteristic of the Cisco SD-Access control plane?

   • AIt allows host mobility only in the wireless network.
   • BIt is based on VXLAN technology.
   • CEach router processes every possible destination and route.
   • DIt stores remote routes in a centralized database server.

   Show answer

   Answer: D

   Explanation

   Instead of a typical traditional routing-based decision, the fabric devices query the control plane node to determine the routing locator associated with the destination address (EID-to-RLOC mapping) and use that RLOC information as the traffic destination. In case of a failure to resolve the destination routing locator, the traffic is sent to the default fabric border node. The response received from the control plane node is stored in the LISP map-cache, which is merged to the Cisco Express Forwarding (CEF) table and installed in hardware.

   Source: Adapted from community discussion — jstaruch

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9. Question 469 · 1003 in bank

   What is the recommended MTU size for a Cisco SD-Access Fabric?

   • A4464
   • B17914
   • C9100
   • D1500

   Show answer

   Answer: C

   Explanation

   Answer C is correct. From cisco: VXLAN adds 50 bytes to the original packet. The common denominator and recommended MTU value available on devices operating in a fabric role is 9100. Network should have a minimum starting MTU of at least 1550 bytes to support the fabric overlay. MTU values between 1550 and 9100 are supported along with MTU values larger than 9100 though there may be additional configuration and limitations based on the original packet size. MTU 9100 is provisioned as part of LAN Automation. Devices in the same routing domain and Layer 2 domain should be configured with a consistent MTU size to support routing protocol adjacencies and packet forwarding without fragmentation. https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-design-guide.html

   Source: Adapted from community discussion — derpo

   References

   • Cisco documentation

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10. Question 470 · 1003 in bank

    A customer transitions a wired environment to a Cisco SD-Access solution. The customer does not want to integrate the wireless network with the fabric. Which wireless deployment approach enables the two systems to coexist and meets the customer requirement?

    • ADeploy the wireless network over the top of the fabric.
    • BImplement a Cisco DNA Center to manage the two networks.
    • CDeploy a separate network for the wireless environment.
    • DDeploy the APs in autonomous mode.

    Show answer

    Answer: A

    Explanation

    Looking at the SD-Access Design Considerations > Wireless Design Section: SD-Access supports two options for integrating wireless access into the network. One option is to use traditional Cisco Unified Wireless Network (CUWN) local-mode configurations over-the-top as a non-native service. In this mode, the SD-Access fabric is simply a transport network for the wireless traffic, which can be useful during migrations to transport CAPWAP-tunneled endpoint traffic from the APs to the WLCs.

    Source: Adapted from community discussion — siteoforigin

    References

    • Cisco documentation

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350-401 practice, question 461. 1003 questions available.