OSPFv2 and OSPFv3 Concepts and Operation JN0-664 Practice Questions (Page 5)

Questions 21–25

1. 21application · medium

   A network engineer is comparing OSPFv2 and OSPFv3 to decide which to deploy for a new IPv6-only network. The engineer notes that OSPFv3 uses a different LSA structure than OSPFv2. Which difference is correct?

   • AOSPFv3 separates prefix information from the Router and Network LSAs
   • BOSPFv3 encodes IPv6 prefixes directly in the Router LSA
   • COSPFv3 includes authentication fields in the Router LSA
   • DOSPFv3 uses the same LSA types as OSPFv2 but with larger headers
   Reveal Solution Discussion Select an answer first
2. 22expert · hard

   A service provider is using OSPFv3 to provide separate routing domains for two customers on a shared Ethernet segment. The provider has configured instance ID 10 for customer A and instance ID 20 for customer B on the same interface. Which statement is correct?

   • AThe instances must be in different areas to operate on the same link
   • BEach instance forms its own adjacency and maintains a separate LSDB
   • CBoth instances share the same LSDB but use different router IDs
   • DThe instances will form a single adjacency with both router IDs
   Reveal Solution Discussion Select an answer first
4. 23foundation · easy

   Which statement about OSPFv3 authentication is true?

   • AOSPFv3 uses the same authentication mechanisms as OSPFv2.
   • BOSPFv3 authentication is optional and can be configured using IPsec.
   • COSPFv3 authentication is mandatory and cannot be disabled.
   • DOSPFv3 supports simple password authentication in the OSPF header.
   Reveal Solution Discussion Select an answer first
5. 24foundation · easy

   Which LSA type is unique to OSPFv3 and does not exist in OSPFv2?

   • ANetwork LSA (Type 2)
   • BRouter LSA (Type 1)
   • CAS-External LSA (Type 5)
   • DIntra-Area-Prefix LSA (Type 9)
   Reveal Solution Discussion Select an answer first
6. 25application · medium

   A service provider is migrating a legacy OSPFv2 backbone to OSPFv3 to support IPv6 transport. The network team has a strict security policy requiring cryptographic authentication for all routing protocol traffic. The existing OSPFv2 configuration uses MD5 authentication. Which action is required to meet the security policy when configuring OSPFv3 on the Junos devices?

   • AConfigure the same MD5 authentication key on all OSPFv3 interfaces
   • BUse the 'area 0 authentication' statement to enforce plain-text passwords
   • CEnable the 'authentication-type' statement under the OSPFv3 protocol hierarchy
   • DConfigure an IPsec security association and apply it to the OSPFv3 interface
   Reveal Solution Discussion Select an answer first