Cisco Implementing and Operating Cisco Service Provider Network Core Technologies Exam Practice Test
The 350-501 SPCOR practice page focuses on service provider routing and forwarding concepts, including IP addressing, VLAN tagging, BGP path selection, and label distribution. Its question bank also touches on gateway redundancy and link-failure detection, connecting protocol behavior with the decisions network engineers make when operating provider infrastructure.
Exam overview
About the Cisco Implementing and Operating Cisco Service Provider Network Co… Exam
Service provider core operations require engineers to interpret routing information across protocols and identify how traffic reaches its destination. Practice vocabulary includes BGP autonomous system numbers and path attributes, administrative distance when routes to the same prefix come from different sources, and LDP label mappings in label-switched networks. Other scenarios address efficient IPv4 addressing for point-to-point links, ARP resolution for Ethernet neighbors, and VLAN tags that distinguish traffic across switched links. Troubleshooting concepts include tracing Layer 3 hops and using BFD to detect link failures more quickly alongside a routing protocol. Gateway redundancy questions focus on how routers present a shared virtual IP to hosts. Together, these topics exercise route comparison, control-plane interpretation, addressing choices, and fault isolation relevant to service provider network operation.
Sample Practice Questions
Review a selection from this exam's published US Practice Tests practice bank.
An engineer needs to determine the sequence of Layer 3 hops toward a destination and identify where replies stop arriving. Which diagnostic utility is designed for this purpose?
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Correct answer: ATraceroute sends probes with progressively increasing IP TTL (or IPv6 hop limit) values. Routers that expire a probe can return an error, allowing the tool to reveal responding hops along the path. Filtering or rate limiting can prevent some hops from responding, so a missing response does not always prove that forwarding stopped there.
What is the main role of an LDP label mapping message?
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Correct answer: ALDP distributes label-to-forwarding-equivalence-class bindings between label switching routers. Peers use these mappings to establish label-switched forwarding for applicable traffic.
In a redundant first-hop gateway design, what is the general purpose of a virtual IP address shared by participating routers?
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Correct answer: AFirst-hop redundancy protocols can present a virtual gateway address to hosts. If the active router fails, another participating router can take over service for that address, reducing dependence on a single physical gateway.
What does an Ethernet VLAN tag primarily allow a switch to do?
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Correct answer: AAn IEEE 802.1Q tag carries VLAN identification information, allowing switches to maintain logical Layer 2 separation over shared links such as trunks. It does not encrypt traffic or specify an IP route.
Which statement describes the role of an autonomous system number (ASN) in BGP?
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Correct answer: AAn ASN identifies an autonomous system and is used in BGP configuration and path information. BGP uses AS-path information to describe the sequence of autonomous systems traversed by a route.
A router learns the same prefix from both iBGP and an interior gateway protocol. Which route is normally preferred when comparing Cisco administrative distance?
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Correct answer: BOn Cisco routers, lower administrative distance is preferred when selecting among routes to the same prefix learned from different routing sources. Common defaults are 90 for EIGRP internal, 110 for OSPF, and 200 for iBGP, so an IGP route typically wins over an iBGP route. Administrative distance is local to the router and is distinct from BGP path attributes.
A provider is assigning IPv4 addresses to point-to-point links and wants to minimize address waste. Which prefix is commonly used when exactly two usable endpoint addresses are needed?
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Correct answer: AA /30 IPv4 subnet contains four addresses: the network address, two usable host addresses, and the broadcast address. It is a traditional fit for a point-to-point link requiring two endpoint addresses.
How to use this practice test
The free practice session draws up to 20 random questions from the 50-question bank. Use it to check your understanding of routing, label distribution, addressing, and connectivity diagnostics; results appear after the session so you can identify which concepts need another pass.
Preparation tips
- Compare BGP path attributes such as the commonly used exit preference attribute, and distinguish their role from administrative distance in route-source selection.
- Trace how LDP label mappings support label-switched forwarding, and relate label distribution to the route information that determines reachability.
- Practice subnetting point-to-point IPv4 links, then verify how ARP resolves a directly connected IPv4 neighbor over Ethernet.
- Use traceroute-style hop analysis to locate where responses stop, and distinguish that path investigation from BFD's link-failure detection role.
- Review how VLAN tags identify traffic on switched links and how a shared virtual IP supports a redundant first-hop gateway.