350-501 practice questions 81–90

1. Question 81 · 377 in bank

   A network engineer is configuring RIP as the routing protocol between multiple PEs and CEs. The engineer must avoid advertising the same routes back to their sources. Which action should be performed on the routers to accomplish this task?

   • ADefine the site of origin on each interface.
   • BConfigure a different route distinguisher for each prefix.
   • CDefine VRFs on each device to separate the traffic.
   • DEnable bidirectional forwarding detection on each device.

   Show answer

   Answer: A

   Explanation

   BGP SOO is a BGP extended community attribute and stands for BGP Site of Origin. SoO uniquely identifies the site that has originated the route. SoO is also useful to prevent routing loops and suboptimal routing, especially used to prevent routing loops on dual-homed sites. SoO can be used even when IGP is used between PE-CE routers and can also be used when BGP is used between PE-CE routers. SoO value needs to be defined in one of the below Naming Conventions – A 16-bit autonomous system number, a colon, and a 32-bit number, for example, 45000:3 A 32-bit IP address, a colon, and a 16-bit number, for example, 192.168.10.2:51 BGP SOO Rule of Operation SOO is applied on updates coming to PE1 from CE router and when these routes are advertised as VPNV4 route to PE router PE2, the PE2 router doesn’t advertise the routes back to the CE router hence avoiding the routing loop.

   Source: Adapted from community discussion — mohdema

   References

   • Cisco documentation
   • Cisco documentation

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2. Question 82 · 377 in bank

   A network engineer is deploying VPLS configuration between multiple PE routers so that customer's remote offices have end-to-end LAN connectivity. Which additional configuration should the engineer perform on the PE routers to enable the virtual switch instance?

   • Al2 vfi ciscotest manual vpn id 100 neighbor 192.168.2.2 encapsulation mpls neighbor 192.168.3.3 encapsulation mpls
   • Binterface GigEthernet 1/1 switchport mode trunk switchport trunk encap dot1q switchport trunk allow vlan 2-10
   • Cinterface Vlan 5 xconnect vfi ciscotest
   • Dinterface Vlan 100 xconnect vfi ciscotest ip address 192.168.1.1 255.255.255

   Show answer

   Answer: A

   Explanation

   A is correct: l2 vfi ciscotest manual vpn id 100 neighbor 192.168.2.2 encapsulation mpls neighbor 192.168.3.3 encapsulation mpls Check page 12 of this document https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9400/software/release/16-6/configuration_guide/mpls/b_166_mpls_9400_cg/b_166_mpls_9400_cg_chapter_01000.pdf

   Source: Adapted from community discussion — ccie_race

   References

   • Cisco documentation
   • Cisco documentation

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3. Question 83 · 377 in bank

   The network-engineering team of a service provider is integrating several recently acquired networks into a more scalable common Unified MPLS architecture. The new network architecture will support end-to-end VPNv4 and VPNv6 services with these requirements: ✑ The IGP of the core layer is IS-IS in Area 0. ✑ The IGP of the aggregation layers is OSPF in Area 0. ✑ The LDP protocol is used to distribute label bindings within each IGP domain. Which task must the network engineer perform when implementing this new architecture?

   • AConfigure a BGP session between the ABR routers of each IGP domain to exchange VPNv4 or VPNv6 prefixes.
   • BConfigure mutual redistribution of each IGP domain's loopback prefix to provide end-to-end LDP LSP.
   • CConfigure the ABR in each IGP domain to preserve next-hop information on all VPNv4 and VPNv6 prefixes advertised by the PE.
   • DConfigure BGP-LU between ABR routers of each IGP domain to carry MPLS label information in NLRI.

   Show answer

   Answer: D

   Explanation

   I guess is D, look... In e-learning Cisco (section 9.11), we have: Redistribution of core IGP into aggregation IGPs and vice-versa is in principle not performed as it would defeat the purpose of the UMPLS scaling benefits. The only exception is the redistribution of the RR (ABR) loopbacks from core IGP into aggregation IGPs because the loopback prefix of the RRs must be known in the aggregation IGP also, so that BGP on the PE router can peer with the loopback of the RR. Other prefixes are never redistributed between the core and aggregation layers. Route Reflectors are configured with the next-hop-self all feature to allow for RRs to change next hop to their own loopback IP even for the reflected prefixes. LDP operates normally inside the IGP islands, however ***BGP labeled unicast layer*** is responsible for the inter network segment label exchange.

   Source: Adapted from community discussion — jefranca

   References

   • Cisco documentation
   • Cisco documentation

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4. Question 84 · 377 in bank

   How is a telemetry session established for data analytics?

   • AA router initiates a session using the dial-out mode to a destination.
   • BA router requests the data using Telnet.
   • CThe destination initiates a session using the dial-out mode to the router.
   • DA destination initiates a session to a router.

   Show answer

   Answer: A

   References

   • Cisco documentation

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5. Question 85 · 377 in bank

   

   Refer to the exhibit. A Cisco engineer is implementing gRPC dial-out on an ASR. Receiver 192.168.1.1 will be assigned one of the subscriptions, and it will manage the ASR. Which command is needed to complete the router configuration?

   • Aprotocol tcp
   • Bprotocol any
   • Cprotocol grpc
   • Dprotocol all

   Show answer

   Answer: C

   Explanation

   It's A supported transport mechanisms: 1. gRPC: used for both dial-in and dial-out modes. 2. TCP: used for only dial-out mode. 3. UDP: used for only dial-out mode But to gRPC command: "protocol grpc tls-hostname <>" or "protocol grpc no-tls". Missing after grpc https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k-r6-6/telemetry/configuration/guide/b-telemetry-cg-asr9000-66x/b-telemetry-cg-asr9000-66x_chapter_010.html

   Source: Adapted from community discussion — jefranca

   References

   • Cisco documentation
   • cisco.com documentation
   • Cisco documentation
   • Cisco documentation
   • Cisco documentation

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6. Question 86 · 377 in bank

   

   Refer to the exhibit. Export statistics received do not include the BGP next hop. Which statement about the NetFlow export statistics is true?

   • ALoopback 0 must be participating in BGP for it to be included in the export statistics.
   • BTo include the BGP next hop in the export statistics, those keywords must be included with the version 9 entry.
   • CThe origin AS and the peer-as will be included in the export statistics.
   • DOnly the origin AS of the source router will be included in the export statistics.

   Show answer

   Answer: B

   Explanation

   Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/netflow/configuration/xe-16-12/nf-xe-16-12-book/cfg-nflow-data-expt-xe.html

   Source: Adapted from community discussion — Mrtadge

   References

   • Cisco documentation
   • Cisco documentation

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7. Question 87 · 377 in bank

   

   Refer to the exhibit. What is significant about the number 2 in the configuration?

   • AIt indicates two SNMP managers can read and write with the agent using community string ciscotest.
   • BIt dictates the number of sessions that can be open with the SNMP manager.
   • CIt is the numeric name of the ACL that contains the list of SNMP managers with access to the agent.
   • DIt represents the version of SNMP running.

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   Answer: C

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8. Question 88 · 377 in bank

   How can a network administrator secure rest APIs?

   • AThey can have a general administrator login for multiple users to access that has command entries logged.
   • BThey can authenticate user sessions and provide the appropriate privilege level.
   • CThey can ensure that user sessions are authenticated using TACACS+ only.
   • DThey can allow read and write privileges to all users.

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   Answer: B

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9. Question 89 · 377 in bank

   DRAG DROP - Drag and drop the technologies from the left onto the correct definitions on the right. Select and Place:

   

   This is an interactive task on the real exam — a drag-and-drop, hotspot or ordering question. There is nothing to select here, so the answer is shown below for reference.

   Show the answer figure

   Answer: See figure below

   Explanation

   IPoDWDM = IP over Dense wavelength-division multiplexing EDFA = Erbium-Doped Fiber Amplifier ROADM = Reconfigurable optical add-drop multiplexer DWDM = Dense wavelength-division multiplexing

   Source: Adapted from community discussion — ccie_race

   

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10. Question 90 · 377 in bank

    What is the difference between SNMP and model-driven telemetry?

    • ASNMP uses the YANG data modeling language.
    • BTelemetry uses traps and inform messages to deliver data to a network administrator on a polling basis.
    • CTelemetry allows for modeled network data to be pushed to the network administrator on an as-needed basis.
    • DSNMP pushes network data to the network administrator whenever it is queried.

    Show answer

    Answer: C

    Explanation

    Model-Driven Telemetry is a new approach for network monitoring in which data is streamed from network devices continuously using a push model and provides near real-time access to operational statistics. Applications can subscribe to specific data items they need, by using standard-based YANG data models over NETCONF-YANG. Cisco IOS XE streaming telemetry allows to push data off of the device to an external collector at a much higher frequency, more efficiently, as well as data on-change streaming.

    Source: Adapted from community discussion — mohdema

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350-501 practice, question 81. 377 questions available.