Ch.29
What size of the router ID (RID) does OSPFv3 use to identify a specific OSPF device? A) 32 bit B) 128 bit C) 16 bit D) 64 bit
Answer: A Explanation: Just like OSPFv2, OSPFv3 uses a 32-bit router ID (RID) that uses the same notation as an IPv4 address. It also uses the same rules as OSPFv2 in determining the RID to use for the router. This means that if a device is only configured with IPv6 addresses, an RID must be manually configured or OSPF will remain disabled until an RID is configured or an IPv4 address is configured on the device. Remediation Link: Chapter 29, Configuring Single-Area OSPFv3
What is the IPv6 equivalent of the 0.0.0.0 0.0.0.0 syntax used with IPv4 to specify a static default route? A) ::/0 B) ::1/0 C) ::0 D) 0::0/0
Answer: A Explanation: When configuring a Cisco IOS static default route using IPv6, the abbreviation ::/0 is used as an equivalent of the IPv4 0.0.0.0 0.0.0.0. Remediation Link: Chapter 29, Static Default Routes
What IPv6 routing table entries will be added with the entry of the ipv6 address 2001:abcd::1/64 Cisco IOS command, assuming the interface is up/up? (Choose all that apply.) A) 2001:abcd::/64 B) 2001:abcd::1/128 C) 2001:abcd::1/64 D) 2001:abcd::/128
Answer: A, B Explanation: When an IPv6 address is configured on an interface, two different entries are added to the IPv6 routing table (when the interface is up/up): the first is the subnet ID of the address being configured; in this case, 2001:abcd::/64. The second is a host route for the specific address configured; in this case, 2001:abcd::1/128. Remediation Link: Chapter 29, Rules for Connected and Local Routes
Which Cisco IOS command is used to create and/or enter into OSPFv3 router configuration mode? A) router ospf process-id B) ipv6 router ospf process-id C) ospfv3 router ospf process-id D) ospf ipv6 router ospf process-id
Answer: B Explanation: The ipv6 router ospf process-id Cisco IOS command is used to create an OSPFv3 process, if it hasn't been created yet, and enters into OSPFv3 router configuration mode. Remediation Link: Chapter 29, Configuring Single-Area OSPFv3
Which version(s) of OSPF are required when implementing a dual stack internal network? (Choose all that apply.) A) Version 5 B) Version 2 C) Version 3 D) Version 6
Answer: B, C Explanation: Two versions of OSPF are used: version 2 and version 3. OSPF version 2 has been used for years and supports IPv4 networks and addresses. OSPF version 3 was developed to work with IPv6 and is not an add-on to version 2; this means that both OSPF version 2 and version 3 are required to be run on a dual stack network. Remediation Link: Chapter 29, OSPF Routing Protocol Versions and Protocols
Which Cisco IOS command is used to display all the sources of IPv6 routing information on a device? A) show protocols B) show protocols ipv6 C) show ipv6 protocols D) show ipv6 interfaces
Answer: C Explanation: The show ipv6 protocols Cisco IOS command is used to display the sources of IPv6 routing information on a device, which is similar to the IPv4 show ip protocols command. Remediation Link: Chapter 29, Verifying OSPFv3 Status and Routes
Which Cisco IOS command is used to display only the host routes within the IPv6 routing table? A) show ipv6 route host B) show ipv6 route connected C) show ipv6 route local D) show ipv6 route
Answer: C Explanation: To display only the host routes within the IPv6 routing table, use the show ipv6 route local Cisco IOS command. Remediation Link: Chapter 29, Examples of Local IPv6 Routes
Which Cisco IOS user exec commands could be the first to be run when trying to re-create the OSPFv3 configuration of a device without having privileged access? A) show running-config B) show ipv6 ospf database C) show ipv6 protocols D) show ipv6 ospf
Answer: C, D Explanation: The show ipv6 protocols and show ipv6 ospf Cisco IOS commands are useful when trying to gather as much information as possible without having privileged access to a device. Obviously, viewing the configuration would probably the easiest method if privileged access was provided. Remediation Link: Chapter 29, Verifying OSPFv3 Configuration Settings
What code is used within the IPv6 routing table to distinguish an IPv6 static route? A) C B) D C) L D) S
Answer: D Explanation: Like the IPv4 routing table, the S code is used to distinguish a static route. Remediation Link: Chapter 29, Static Routes Using the Outgoing Interface
Which Cisco IOS command is used to enable OSPFv3 for a specific interface? A) ipv6 ospf process-id B) network network C) network network area area-id D) ipv6 ospf process-id area area-id
Answer: D Explanation: OSPFv3 does not use the network network area area-id command like OSPFv2 does to enable OSPF on a specific interface; it uses the ipv6 ospf process-id area area-id interface command. Remediation Link: Chapter 29, Comparing OSPFv2 and OSPFv3
