350-501 practice questions 351–360

1. Question 351 · 377 in bank

   How do CSC VPN services use BGP to support connectivity between customer sites?

   • ABGP uses address families for IPv6 support in networks that use IPv4 and IPv6 between customers in different geographies
   • BBGP eliminates the need for an IGP to run within the backbone earner core and provides more efficient label distribution
   • CThe BGP AS-Override feature allows the CSC network to use the same autonomous system number
   • DBGP sends labels to the CSG-PE router so that traffic can traverse the backbone carrier

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   Answer: D

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2. Question 352 · 377 in bank

   

   Refer to the exhibit. OSPF is configured within the core of the service provider network. Connectivity between CE1 and CE2 is provided through the core. An engineer is implementing MPLS to support traffic exchange between customer sites using Layer 3 VPNs. Which task must the engineer perform to secure VPN traffic to meet the SLA of continuous uptime?

   • AImplement OSPF stub routing to eliminate routes from being shared over the VPN
   • BImplement BGP as the PE-CE routing protocol to support labels for faster data transfer
   • CImplement LDP sync to prevent packet loss
   • DImplement IS-IS in the core to segregate critical traffic between different areas

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   Answer: C

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3. Question 353 · 377 in bank

   

   Refer to the exhibit. Customer C-101 in ASN 65123 requested that the ISP blackholes a host route 198.19.44.195, to which the customer is receiving a significant amount of malicious traffic. Which configuration must the network engineer implement on the trigger router TR-1 to fulfill the request without affecting other IP destinations in the customer’s block?

   • Aconfigure terminal ip prefix-list BLACKHOLE-PERMIT seq 5 permit 198.19.44.0/24 le 32 ip route 198.19.44.195 255.255.255.255 Null0 tag 9090 end
   • Bconfigure terminal ip prefix-list BLACKHOLE-PERMIT seq 5 permit 198.19.44.195/32 ip route 198.19.44.195 255.255.255.255 Null0 tag 9090 end
   • Cconfigure terminal ip prefix-list BLACKHOLE-PERMIT permit 198.19.44.0/24 le 32 ip route 198.19.44.195 255.255.255.255 Null0 tag 9090 end
   • Dconfigure terminal ip prefix-list BLACKHOLE-PERMIT permit 198.19.44.195/24 ip route 198.19.44.195 255.255.255.255 Null0 tag 9090 end

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   Answer: B

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4. Question 354 · 377 in bank

   

   Refer to the exhibit. MPLS is configured within the network. The routers use OSPF to exchange routing information. Hosts that are connected to routers R1 and R3 use routers R2 and R4 to access servers that run a variety of intranet applications. A network engineer must ensure that R1 and R3 maintain an LDP session between them to support the flow of traffic between hosts and servers. Which task should the engineer perform to provide LDP bindings in case of failure on the path between R1 and R3?

   • AImplement session protection to send targeted hellos between R1 and R3.
   • BImplement multicast in the network to share data between hosts and servers without targeted routing.
   • CImplement BFD to monitor and detect link failures between R1 and R3.
   • DImplement LDP sync on the four devices to give MPLS and OSPF the ability to maintain continuous uptime.

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   Answer: A

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5. Question 355 · 377 in bank

   

   Refer to the exhibit. AS 65517 is running OSPF within the core. BGP is running between all four autonomous systems, interconnecting several ISPs that provide intranet and extranet services. All of the PE routers are connected, and eBGP peering relationships have been established. A network engineer also configured an IBGP peering between PE1 and P1, and the peering is up. However, P1 cannot reach routes outside of AS 65517. Which action must the engineer take so that P1 reaches external routes?

   • ASynchronize BGP and OSPF with AS 65517.
   • BConfigure P1 as a route-reflector-client to PE1.
   • CInstall route targets on alt PE routers under the VRF configuration for intranet services.
   • DAdd the next-hop-self attribute under the BGP neighbor configuration for P1 on PE3.

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   Answer: D

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6. Question 356 · 377 in bank

   What should a network engineer consider before implementing segment routing?

   • AIt is an MPLS-based routing technique.
   • BIt is a multicast-based routing technique.
   • CIt is a destination-based routing technique.
   • DIt is a source-based routing technique.

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   Answer: D

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7. Question 357 · 377 in bank

   

   Refer to the exhibit. A growing company wants to ensure high availability and redundancy for its critical web servers, which are located in an offsite data center. The network architect decided to implement BGP so that the network can use redundant paths for outbound traffic toward the destination subnet 10.2.2.0/24. A network engineer already configured basic BGP settings on edge router R1, which is a Cisco ASR-1001X router. The engineer also confirmed loopback reachability to routers R2 and R3, and the AS path length toward the destination is the same via R2 and R3. Which action must the engineer take on R1 to complete the implementation?

   • AImplement as-path multipath under the BGP neighbor configuration.
   • BImplement bestpath as-path multipath-relax under the BGP global configuration.
   • CImplement maximum-paths multipath ibgp 2 under the BGP neighbor configuration.
   • DImplement maximum-paths 2 under the BGP global configuration.

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   Answer: D

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8. Question 358 · 377 in bank

   

   Refer to the exhibit. An engineer working for a private service provider with an employee ID: 1234:56:789 is configuring BGP in AS 400, AS 500, and AS 600 to set up BGP peering. The engineer reported that 172.16.10.0/24 is not installed in the R2 RIB. RI and R5 receive the prefix 172.16.10.0/24 in the BGP routing table. Which configuration must be implemented to stop receiving prefix 172.16.10.0/24 in the BGP table?

   • AConfigure bgp suppress-inactive under BGP address-family ipv4 unicast on R2.
   • BConfigure bgp suppress-inactive under BGP address-family ipv4 unicast on R1 and R5.
   • CConfigure route-map blockprefix out under BGP on R2.
   • DConfigure route-map blockprefix in under BGP on R1 and R5.

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   Answer: A

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9. Question 359 · 377 in bank

   What is the primary purpose of NAT64?

   • Aallow lPv4-addressed and IPv6-addressed devices to access cloud services using a VPN tunnel
   • Ballow an IPv4-addressed device to access the internet using an IPv6 address
   • Callow an IPv6-addressed device to communicate with an IPv4-addressed device
   • Dallow IPv4-addressed and IPv6-addressed devices to communicate with each other only if they exist within the same geographic location

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   Answer: C

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10. Question 360 · 377 in bank

    

    Refer to the exhibit. The four PE routers in the network are connected and running OSPF to share routes. MPLS is enabled on the four routers. The routers are connected and configured to use /30 networks. A network engineer must implement Layer 3 VPN support for traffic between customer sites. Which task must the engineer perform?

    • AConfigure the devices to establish LDP neighbor relationships to share label information.
    • BDeploy IGP in the network to exchange intranet data between the PEs.
    • CUpdate the subnet between each router to a /24 prefix.
    • DImplement MPLS ТЕ tunnels between each router to provide dedicated bandwidth for Layer 3 VPN traffic.

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    Answer: A

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