Nokia 4A0-113 Question Answer
Which of the following are similarities between OSPF and IS-IS? Choose two answers.
Metric is based on hop count.
Slow convergence after link failures.
Support hierarchy through the use of areas.
Support for CIDR.
Link state updates sent using layer 3 multicast.
Comprehensive and Detailed Explanation From Exact Extract:
From Nokia 7750 SR OS Routing Protocols Guide (OSPF vs. IS-IS Comparison):
C (Correct):
“Both OSPF and IS-IS support hierarchical design through the use of areas (OSPF Area 0 backbone; IS-IS Level 1/Level 2 hierarchy).”
D (Correct):
“Both protocols support variable length subnet masks (VLSM) and Classless Inter-Domain Routing (CIDR).”
Incorrect options:
A: Both use cost-based metrics, not hop count.
B: Both protocols converge quickly (they are link-state protocols).
E: IS-IS uses Layer 2 (CLNS) for communication, not Layer 3 multicast.
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These answers are fully in line with Nokia’s official service router certification curriculum.
TESTED 02 Jan 2026
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