The correct choices are that the Anycast SID is shared among multiple routers in the same anycast group and that it provides redundancy and fast convergence. In Segment Routing, an Anycast SID is a type of Prefix-SID advertised by multiple nodes within the same anycast group, allowing traffic to be load-balanced across those routers while ensuring that if one node fails, another automatically takes over, enabling sub-50ms convergence. On the Cisco SPCOR 350-501 exam, this concept tests your understanding of how Anycast SID differs from Node-SID, which is unique per router, and Adj-SID, which identifies a specific link. A common trap is confusing Anycast SID with Adjacency SID or assuming it is unique per device; remember that Anycast SID is essentially a shared "virtual" prefix SID for a group of routers. Memory tip: think "Anycast = Any router in the group can cast the traffic," and contrast it with "Node-SID = One unique router."
350-501 MPLS and Segment Routing Practice Question
This 350-501 practice question tests your understanding of mpls and segment routing. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which two are characteristics of the Anycast SID in Segment Routing? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It provides redundancy and fast convergence by allowing traffic to be rerouted to another router.
B correct: multiple nodes can advertise the same Anycast SID, enabling load balancing. E correct: Anycast SID is used for redundancy and fast convergence. A wrong: Node-SID is unique. C wrong: Anycast SID is not for adjacency. D wrong: The Anycast SID is advertised with a prefix SID type, not an Adj-SID type.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
It identifies an adjacency between two routers.
Why it's wrong here
Adjacency SID identifies a link, not anycast.
✗
It is typically used as an Adj-SID for load balancing.
Why it's wrong here
Anycast SID is a prefix SID, not an Adj-SID.
✗
It is unique per node and identifies a specific router.
Why it's wrong here
Uniqueness is for Node-SID, not Anycast SID.
✓
It provides redundancy and fast convergence by allowing traffic to be rerouted to another router.
Why this is correct
If one anycast router fails, traffic goes to another.
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Got this wrong? Here's your next step.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 350-501 OSPF questions on adjacency and route selection.
MPLS and Segment Routing — This question tests MPLS and Segment Routing — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: It provides redundancy and fast convergence by allowing traffic to be rerouted to another router. — B correct: multiple nodes can advertise the same Anycast SID, enabling load balancing. E correct: Anycast SID is used for redundancy and fast convergence. A wrong: Node-SID is unique. C wrong: Anycast SID is not for adjacency. D wrong: The Anycast SID is advertised with a prefix SID type, not an Adj-SID type.
What should I do if I get this 350-501 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 350-501 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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