350-501 practice questions 181–190

1. Question 181 · 377 in bank

   FRR is configured on a network. What occurs when the headend router on the path is alerted to a link failure over IGP?

   • ALSP attempts fast switching on the backup path until the primary path returns to the active state.
   • BThe headend router uses a presignaled LSP to bypass the failure point.
   • CA new backup tunnel is established past the PLR to pass through the protected nodes.
   • DBackup tunnel is established and intersects with the primary tunnel at the headend.

   Show answer

   Answer: B

   Explanation

   Answer: B https://www.cisco.com/en/US/docs/ios/12_0st/12_0st10/feature/guide/fastrout.html Fast Reroute provides link protection to LSPs. This enables all traffic carried by LSPs that traverse a failed link to be rerouted around the failure. The reroute decision is completely controlled locally by the router interfacing the failed link. The headend of the tunnel is also notified of the link failure through the IGP or through RSVP; the headend then attempts to establish a new LSP that bypasses the failure.

   Source: Adapted from community discussion — sushil_bhattacharjee

   References

   • Cisco documentation
   • Cisco documentation
   • Cisco documentation

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2. Question 182 · 377 in bank

   How does Inter-AS Option-A function when two PE routers in different autonomous systems are directly connected?

   • AThe two routers share all Inter-AS VPNv4 routes and redistribute routes within an IBGP session to provide end-to-end reach.
   • BThe two routers establish an MP-EBGP session to share their customers' respective VPNv4 routes.
   • CThe two routers treat one another as CE routers and advertise unlabeled IPv4 routes through an EBGP session.
   • DThe two routers share VPNv4 routes over a multihop EBGP session and set up an Inter-AS tunnel using one another's label.

   Show answer

   Answer: C

   References

   • cisco.com documentation

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3. Question 183 · 377 in bank

   Select 2

   

   Refer to the exhibit. An engineer at ISP C is configuring a new interconnection with ISPs A and B using the BGP protocol. After the initial configuration, the engineer noticed high memory usage and an abnormally large LIB table on router R2. Which two actions must the engineer take on R2 to minimize memory usage? (Choose two.)

   • AConfigure the mpls ldp neighbor 11.11.11.11 labels accept 1 command.
   • BConfigure Standard ACL 1 with accepted prefixes.
   • CConfigure Extended ACL 101 with accepted prefixes.
   • DConfigure the mpls ldp neighbor 1.1.1.1 labels accept 101 command.
   • EConfigure the mpls ldp neighbor 21.21.21.21 labels accept 101 command.

   Show answer

   Answer: AB

   Explanation

   I was breaking my head about this cause, why having LDP on a peering with another ISP using BGP (eBGP I take it). Here you would normally use labelled-unicast... Then, I found this link by Benxi and saw that only standard ACLs are allowed for inbound filtering. So this got my mind to think it must indeed be A & C.

   Source: Adapted from community discussion — JoostAtExamtopics

   References

   • Cisco documentation

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4. Question 184 · 377 in bank

   An engineer is configuring IEEE 802. 1ad on the access port on a new Cisco router. The access port handles traffic from multiple customer VLANs, and it is expected to mark allcustomer traffic to the same VLAN without dropping any traffic. Which configuration must the engineer apply?

   • Ainterface gigabitethernet0/0/1 ethernet dot1ad uni s-port
   • Binterface gigabitethernet0/0/1 ethernet dot1ad uni c-port
   • Cinterface gigabitethernet0/0/1 ethernet dot1ad uni nni
   • Dinterface gigabitethernet0/0/1 encapsulation dot1q 10

   Show answer

   Answer: A

   Explanation

   Yes, here is the link: https://www.cisco.com/c/en/us/td/docs/routers/asr920/configuration/guide/ce/b_ce_xe-313s-asr920-book/b_ce_xe-313s-asr920-book_chapter_01100.html#concept_53CC8A5B450F4F83A3F3AC572FF72A86 S-UNI—an access port that provides the same service to all customer VLANs entering the interface, marking all C-VLANs entering the port with the same S-VLAN. In this mode, the customer's port is configured as a trunk port, and traffic entering the S-UNI is tagged. Use the ethernet dot1ad uni s-port interface configuration command on an access port with an access VLAN.

   Source: Adapted from community discussion — Worgen44

   References

   • Cisco documentation

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5. Question 185 · 377 in bank

   DRAG DROP - Drag and drop the characteristics from the left onto the corresponding radio splitting approaches 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

   Rough explanations: Low level split 4G/5G Tower----Baseband Unit(BBU)-----Core network Fronthaul: network between tower and BBU Backhaul: network between BBU and core requires more bandwidth High level Split 4G/5G Tower----[BBU far edge-------BBU edge]------Core network Midhaul: network between different units within BBU its used for low-latency communication so requires low RTT

   Source: Adapted from community discussion — ccie_race

   References

   • Cisco documentation

   

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6. Question 186 · 377 in bank

   Select 2

   

   Refer to the exhibit. A large service provider is migrating device management from Layer 2 VLAN-based to Layer 3 IP-based solution. An engineer must configure the ISIS solution with these requirements: ✑ Network management server IP 172.16.10.1 must be advertised from the core MPLS network to the regional domain. ✑ The external network 202.10.0.0/24 must not establish ISIS peering with the R5 router. ✑ The regional network must prevent sending unnecessary hello packets and flooding the routing tables of the R5 router. Which two ISIS parameters must be implemented to meet these requirements? (Choose two.)

   • ALSP lifetime maximum
   • Badvertise-passive-only
   • Coverload bit passive
   • Dattached bit on ISIS instance
   • Epassive-interface Loopback0

   Show answer

   Answer: BE

   References

   • Cisco documentation

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7. Question 187 · 377 in bank

   What is a characteristic of data modeling language?

   • AIt provides an interface for state data.
   • BIt separates configuration and state data.
   • CIt ensures devices are individually configured.
   • DIt replaces SNMP.

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   Answer: B

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8. Question 188 · 377 in bank

   What does DWDM use to combine multiple optical signals?

   • AIP protocols
   • Bwavelength
   • Ctime slots
   • Dfrequency

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   Answer: B

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9. Question 189 · 377 in bank

   Which function does RSVP perform in a Cisco MPLS TE environment?

   • AIt establishes targeted LDP sessions between neighbors that are directly connected.
   • BIt signals to LDP protocol along the path that a Cisco MPLS TE will be configured.
   • CIt reserves bandwidth for LDP sessions between routers participating in a Cisco MPLS TE.
   • DIt reserves the bandwidth along the path between the head-end and tail-end router.

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   Answer: D

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10. Question 190 · 377 in bank

    A network operator working for a private outsourcing company with an employee id: 4261:72:778 needs to limit the malicious traffic on their network. Which configuration must the engineer use to implement URPF loose mode on the GigabitEthernet0/1 interface?

    • Arouter(config)# interface gigabitethernet0/1 router(config-if)# ip address 192.168.200.1 255.255.255.0 router(config-if)# ip verify unicast source reachable-via any router(config-if)# ipv6 address 2001:DB8:1::1/96 router(config-if)# ipv6 verify unicast source reachable-via any
    • Brouter(config)# interface gigabitethernet0/1 router(config-if)# ip address 192.168.200.1 255.255.255.0 router(config-if)# ip verify unicast source reachable-via rx router(config-if)# ipv6 address 2001:DB8:1::1/96 router(config-if)# ipv6 verify unicast source reachable-via rx
    • Crouter(config)# interface gigabitethernet0/1 router(config if)# ip address 192.168.200.1 255.255.255.0 router(config-if)# ip verify unicast source reachable-via rx router(config-if)# ipv6 address 2001:DB8:1::1/96 router(config-if)# ipv6 verify unicast source reachable-via any
    • Drouter(config)# interface gigabitethernet0/1 router(config-if)# ip address 192.168.200.1 255.255.255.0 router(config-if)# ip verify unicast source reachable-via any router(config-if)# ipv6 address 2001:DB8:1::1/96 router(config-if)# ipv6 verify unicast source reachable-via rx

    Show answer

    Answer: A

    References

    • Cisco documentation

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350-501 practice, question 181. 377 questions available.