Cisco 350-501 Online Practice Questions and Exam Preparation

Cisco 350-501 Online Questions & Answers

• Question 101:

  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:

  1. The IGP of the core layer is IS-IS in Area 0.

  2. The IGP of the aggregation layers is OSPF in Area 0.

  3. 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?

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

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  Explanation

• Question 102:

  Which protocol in the IPv6 stack does the MLD protocol use to carry its messages?

  A. NDP
  B. IGMPv6
  C. DHCPv6
  D. IGMP
  E. ICMPv6
  E. ICMPv6

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  Explanation

• Question 103:

  Which three OSPF parameters must match before two devices can establish an OSPF adjacency? (Choose three.)

  A. IP address
  B. subnet mask
  C. interface cost
  D. process ID
  E. area number
  F. hello timer setting
  B. subnet mask
  E. area number
  F. hello timer setting

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  Explanation

  For OSPF, the subnet mask must match between two devices on the same network segment to form an adjacency, as it defines the network's address range. The hello timer setting is crucial for the OSPF Hello protocol, which is used for neighbor discovery and maintaining neighbor relationships. Finally, the area number must be the same because OSPF uses areas to define a hierarchy within the network, and routers within the same area share routing information. OSPF is a link-state protocol that requires certain parameters to match for a successful adjacency. This includes the subnet mask, hello timer, and area number, which are fundamental to OSPF's operation and ensure that routers can communicate effectively within the same area

• Question 104:

  Which set of facts must the network architect consider when deciding whether to implement SaltStack or Chef?

  A. Chef is an agent-based tool based on Ruby and SaltStack is a module tool based on Python
  B. Chef refers to its automation instructions as manifests and SaltStack refers to its instructions as a playbook
  C. Chef uses a message-based system and SaltStack uses an agent to deliver messages.
  D. Chef is written in Python and SaltStack is written in Ruby.
  A. Chef is an agent-based tool based on Ruby and SaltStack is a module tool based on Python

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  Explanation

  When choosing between SaltStack and Chef for network automation, it is important to consider that Chef is an agent-based tool written in Ruby, while SaltStack is a Python-based module tool. This fundamental difference in language and architecture can influence the decision based on the existing environment and the team's expertise.

  References:

  Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) course materials.

  Official Cisco documentation and training resources available on the Cisco Learning Network Store.

• Question 105:

  Which two PHY modes are available to implement an IOS XR 10 Gigabit Ethernet interface? (Choose two.)

  A. LAN
  B. SONET
  C. MAN
  D. WAN
  E. WDWM
  A. LAN
  D. WAN

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  Explanation

  https://www.cisco.com/c/en/us/td/docs/routers/crs/software/crs_r4-1/interfaces/command/reference/interfaces_cr41crs_chapter19.html

• Question 106:

  According to RFC5305 on IS-IS extensions for traffic engineering, what is the 4-octet sub- TLV type 10 of extended IS-IS reachability TLV type 22?

  A. TE default metric
  B. maximum reservable link bandwidth
  C. administrative group (color)
  D. IPv4 neighbor address
  B. maximum reservable link bandwidth

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  Explanation

  RFC 5305 extends the IS-IS protocol for traffic engineering by specifying new information that an Intermediate System (router) can place in Link State Protocol Data Units (LSPs). Sub-TLV type 10 of the extended IS-IS reachability TLV type 22 is used to specify the maximum reservable link bandwidth. This is an important parameter for traffic engineering as it defines the amount of bandwidth that can be reserved by traffic engineering algorithms for use in constrained-path computations for MPLS traffic engineering Label Switched Paths (LSPs). References: RFC 53051.

• Question 107:

  Refer to the exhibit.

  

  An engineer must implement a traceroute operation to verify the R1 point-to-multipoint LSP connections. The traceroute operation must return all labels and hop-by-hop IP addresses for destinations 10.20.0.1, 10.30.0.1, and 10 40.0.1, and the maximum number of hops is 4.

  Which command must be executed to meet the requirements?

  A. traceroute mpls ipv4 10.30.0.1/32 fec-type generic
  B. traceroute mpls ipv4 10.20.0.1/32 ttl 4
  C. traceroute mpls traffic-eng tunnel-mte 10 ttl 4
  D. traceroute mpls traffic-eng tunnel-mte 10 responder-id 10.40.0.1
  C. traceroute mpls traffic-eng tunnel-mte 10 ttl 4

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  Explanation

  https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mpls/command/mp-cr-book/mp-t1.html

• Question 108:

  Refer to the exhibit.

  

  interface gigabitethernet 0/2 no ip directed-broadcast

  Which type of DDoS attack will be mitigated by this configuration?

  A. SYN flood
  B. smurf attack
  C. SIP INVITE flood attacks
  D. teardrop attack
  B. smurf attack

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  Explanation

  The configuration shown in the exhibit is used to disable IP directed-broadcasts on a specific interface of a network device. This is typically done to mitigate smurf attacks, which involve sending a large amount of ICMP echo (ping) traffic to IP broadcast addresses, all having a spoofed source address of the victim's IP. By disabling IP directed-broadcasts, the network device will not forward packets that are sent to broadcast addresses, thus mitigating this type of DDoS attack.

  References: Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) - Module on Security in the Service Provider Network

• Question 109:

  Refer to the exhibit.

  

  Tier 1 ISP A is connected to small Tier 3 ISP B. The EBGP routing protocol is used for route exchange. The networking team at ISP A noticed the flapping of BGP sessions with ISP B. The team decides to improve stability on the network by suppressing the subnet for 30 minutes when a session begins to flap.

  Which action must the team perform to meet this goal?

  A. Implement BGP route dampening on ISP A router R1 with the bgp dampening 15 700 1500 30 command.
  B. Implement a BGP route withdraw-delay timer on ISP B router R3 with the bgp withdraw-delay 30 15 90 30 command.
  C. Implement a BGP route-penalty timer on ISP A router R1 with the bgp penalty-timer 30 250 750 15 command.
  D. Implement BGP route suppression on ISP A router R2 with the bgp suppression 30 600 1200 30 command.
  A. Implement BGP route dampening on ISP A router R1 with the bgp dampening 15 700 1500 30 command.

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  Explanation

  To address the issue of BGP session flapping between ISP A and ISP B, the networking team at ISP A should implement BGP route dampening. This feature helps stabilize the network by suppressing the advertisement of flapping routes. The command bgp dampening 15 700 1500 30 will set the parameters for route dampening, where routes that flap will be suppressed for 30 minutes. This action will prevent the constant advertisement and withdrawal of unstable routes, thus improving the stability of the network.

  References: For further details on BGP route dampening and its configuration, the Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) course materials and Cisco's official documentation provide comprehensive guidance.

• Question 110:

  

  Refer to the exhibit. OSPF is the routing protocol between the PE-CE link in a multihomed topology. OSPF is needed to achieve rapid convergence in case of a link failure. Which option is the waiting time between reception of the same LSA from an OSPF neighbor?

  A. 50 msecs
  B. 2 seconds
  C. 6 seconds
  D. 4000 seconds
  E. 75 msecs
  B. 2 seconds

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  Explanation