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Read each scenario carefully and choose your answer before revealing the explanation. Then check why your choice was right or wrong. Repeat until the reasoning feels automatic.

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350-501 · topic practice

Security and Services practice questions

Practise Cisco SPCOR / CCNP Service Provider Core 350-501 Security and Services practice questions — original exam-style scenarios with answer choices, explanations, and analysis of common mistakes.

Courseiva uses original exam-style practice questions designed for learning and revision. The goal is to understand the concepts, recognise exam patterns, and improve through explanations — not memorise copied exam dumps.

Reviewed byJohnson Ajibi· MSc IT Security

20 questionsDomain: Security and Services

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What the exam tests

What to know about Security and Services

Security and Services questions test whether you can apply the concept in context, not just recognise a definition.

How the topic appears in realistic exam-style scenarios.

Which detail in the question changes the correct answer.

How to eliminate plausible but wrong options.

How to connect the question back to the wider exam objective.

Watch out for

Common Security and Services exam traps

▸Answering from memory before reading the full scenario.
▸Missing a constraint such as cost, availability, security, scope or command context.
▸Choosing a broad answer when the question asks for the most specific fix.
▸Ignoring why the wrong options are tempting.

Practice set

Security and Services questions

20 questions · select your answer, then reveal the explanation

Question 1easymultiple choice

Review the full routing breakdown →

A service provider wants to protect its routers from CPU overload caused by excessive traffic to the control plane. Which mechanism should be configured on IOS XR routers to classify and rate-limit management traffic?

Trap 1: uRPF strict mode

uRPF is used for anti-spoofing, not for control plane protection.

Trap 2: BGP Flowspec

BGP Flowspec distributes traffic filtering rules, but does not directly rate-limit control plane traffic.

Trap 3: MPLS TTL propagation

MPLS TTL propagation is related to label spoofing prevention, not control plane protection.

Study all Security and Services common traps →

A
uRPF strict mode
Why wrong: uRPF is used for anti-spoofing, not for control plane protection.
B
BGP Flowspec
Why wrong: BGP Flowspec distributes traffic filtering rules, but does not directly rate-limit control plane traffic.
C
MPLS TTL propagation
Why wrong: MPLS TTL propagation is related to label spoofing prevention, not control plane protection.
D
CoPP (Control Plane Protection)
CoPP is designed to protect the control plane by rate-limiting traffic.

Security and Services practice questions

What to know about Security and Services

Common Security and Services exam traps

Security and Services questions

A service provider wants to protect its routers from CPU overload caused by excessive traffic to the control plane. Which mechanism should be configured on IOS XR routers to classify and rate-limit management traffic?

An engineer is configuring management plane hardening on an IOS XR router. The requirement is to authenticate users against a central server and provide granular command authorization. Which protocol and feature should be used?

A service provider is deploying uRPF on customer-facing interfaces to prevent IP spoofing. The network has asymmetric routing due to multiple upstream connections. Which uRPF mode should be used?

During a DDoS attack, an SP uses Cisco Peakflow for detection and wants to drop attack traffic at the edge routers. They decide to use S/RTBH. Which action must be performed on the edge routers to trigger the black hole?

An SP wants to filter BGP prefixes received from a customer to prevent hijacking. Which two tools can be used together on the provider edge router to implement inbound prefix filtering?

An SP is implementing RPKI to validate BGP route origins. They have set up an RPKI cache and configured routers with the RPKI-to-Router (RTR) protocol. During validation, a route is received with an AS that does not match any ROA. What is the validation state?

A network engineer needs to perform maintenance on a BGP router without causing traffic loss. They plan to use BGP Graceful Shutdown (GSHUT). What does GSHUT do?

To prevent MPLS label spoofing in a Layer 3 VPN, which configuration should be applied on the PE-CE link?

A service provider is deploying a BNG for subscriber management. Which protocol is used to authenticate subscribers and assign IP addresses via the BNG?

An SP is implementing CGNAT to conserve IPv4 addresses. For legal compliance, they must log all NAT translations with timestamps and source/destination information. Which CGNAT feature should be enabled?

An SP uses DPI to classify traffic. What is the primary purpose of DPI in a service provider network?

An engineer is configuring NTP authentication on IOS XR routers to ensure secure time synchronization. What is required for NTP authentication to work?

An SP wants to secure management access to IOS XR routers. Which two measures should be implemented? (Choose two.)

An SP is implementing DDoS mitigation using BGP FlowSpec. Which three types of actions can be specified in a FlowSpec rule? (Choose three.)

An SP is deploying BGP security features. Which three mechanisms can be used to prevent BGP route hijacking? (Choose three.)

A service provider wants to protect its core routers from CPU exhaustion caused by excessive ICMP traffic. Which control plane protection mechanism on IOS XR would be most appropriate to rate-limit ICMP packets destined to the router?

An SP engineers want to restrict management access to their IOS XR routers. Which combination provides the most secure management plane hardening?

A service provider deploys uRPF on customer-facing interfaces to prevent IP spoofing. They have a multihomed customer with asymmetric routing. Which uRPF mode should be used to avoid dropping legitimate traffic?

During a DDoS attack, an SP wants to drop traffic destined to the victim IP at the network edge without affecting other traffic. Which technique should be used to achieve this by propagating a black-hole route from a trigger router to all edge routers?

A service provider uses BGP to exchange routes with customers. To prevent the customer from announcing prefixes they do not own (BGP hijacking), which tool should the provider apply on the customer-facing BGP session?

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