Cisco 350-501 Implementing and Operating Cisco Service Provider Network Core Technologies SPCOR Exam Practice Test

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Total 452 questions
Question 1

Refer to the exihibit.

Refer to the exhibit. A large enterprise has multiple branch offices that span several geographic regions. The enterprise runs MPLS within the core to propagate VPNv4 routes using BGP. After a recent series of DDoS attacks disrupted the network, a network engineer has been asked to reconfigure BGP to help mitigate future attacks. Which configuration must the engineer apply?

A)

B)

C)

D)



Answer : B

To mitigate DDoS attacks in a BGP environment, an engineer can apply BGP FlowSpec, which allows for the creation of traffic filtering policies that can be distributed across the network.This configuration enables the network to respond quickly to DDoS attacks by filtering or redirecting malicious traffic based on predefined criteria, such as source IP, destination IP, and port numbers456.


Question 2

Refer to the exihibit.

Refer to the exhibit. ISP_A is about to launch a new internet service. ISP_A is already providing MPLS VPN Layer 3 services to Customer_A and Customer_B, which are connected to ISP_A via OSPF. A network engineer completed the BGP and VRF configurations on R2 to support the new internet service. Which additional action completed the launch?



Answer : B

To complete the launch of the new internet service, ISP_A needs to ensure that routes are shared between different VRFs for Customer_A and Customer_B. Importing route-target 62:101 into the customer VRFs on R1 and R3 allows for the exchange of routes between these VRFs, facilitating the necessary connectivity for the new service.Reference:=Cisco SPCOR


Question 3

Refer to the exihibit.

Refer to the exhibit. ISP_A and ISP_B use AS numbers 38321 and 16213 respectively. After a network engineer reloaded router R1, the BGP session with R2 failed to establish. The engineer confirmed BGP next-hop availability with a connectivity test between the router loopback addresses 10.121.123.2 and 10.121.123.1, as well as between interfaces Gi1/1 and Gi1/2. EBGP multihop has been configured on both routers. Which action must the engineer take to resolve the issue?



Answer : C

After a router reload, BGP sessions may fail to re-establish due to incorrect source interface configurations for BGP sessions. Since EBGP multihop has been configured, it's essential that the BGP session uses the correct source interface for establishing the connection. By configuring the neighbor update-source command with the loopback interface on R2, the BGP session will use the stable loopback address rather than the physical interface, which can change state.This ensures that the BGP session remains stable and is not affected by interface states.Reference: BGP Troubleshooting Cheat Sheet With Examples - Catchpoint2, BGP session stuck in Idle state after NSRP failover - Juniper Networks3, BGP Session is Disconnected - Network Playbook


Question 4

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?



Answer : B

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).Reference: RFC 53051.


Question 5

A mod-size service provider uses L2VPN as its standard for connectivity between offices. A small company wants the service provider to connect the company's two sites across the service provider core. To meet service requirements, the service provider must extend the layer 2 domain between the company's two locations. Which configuration must the engineer apply to implement an attachment circuit between the two sites using a VLAN tag of 12?



Answer : C

The correct configuration for extending the layer 2 domain between the company's two locations involves setting up the interface with L2 transport, specifying the encapsulation method as dot1q with the VLAN tag of 12, and applying the appropriate rewrite ingress tag rules. This setup ensures that the VLAN tag is preserved across the service provider's core, maintaining the layer 2 domain continuity.


Question 6

Refer to the exihibit.

Refer to the exhibit. A network engineer is configuring an SNMP community on router RB with these requirements:

Allow read-only access for all objects to members of Access-List 10 that use the comaccess community string.

Other SNMP managers must not have access to objects.

SNMP authentication failure traps must be sent to SNMPv2c and then to the host using SNMPv2c with the public community string.

Which configuration meets these requirements?



Answer : B

Option B is the correct answer because it meets all the given requirements. The configuration ''snmp-server community comaccess ro 10'' allows read-only access for all objects to members of Access-List 10 that use the comaccess community string. The ''snmp-server host ABC.com informs version 2c public'' command ensures SNMP authentication failure traps are sent to SNMPv2c and then to the host using SNMPv2c with the public community string.


Question 7

What is an enhancement that Cisco IOS XE Software has over Cisco IOS Software?



Answer : A

Cisco IOS XE Software is an open and flexible operating system optimized for a variety of network infrastructures. One of its key enhancements over Cisco IOS Software is the support for symmetric multiprocessing (SMP). This allows the operating system to efficiently utilize multiple CPU cores, improving performance and scalability for network services.


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