Two basics ways to enable OSPFv2 in an active interface are:
1) OSPFv2 Traditional configuration:
R1(config)# router ospf <process-id>
R1(config-router)# network <network-adddress> <wildcard-mask> area <area-number>
2) OSPv2 Interface configuration:
R1(config)# interface gigabitEthernet 0/0
R1(config-router)# ip ospf <process-if> area <area-number>
Where: R1 is the hostname of the router.
As you can see, the "process-id" and the "area-number" are necessary parameters in both configurations, including the quad-zero configuration that is similar to the "Traditional" way.
Ref: Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 5.x
“…
Configuring Networks in OSPFv2
…
SUMMARY STEPS
1. configure terminal
2. interface interface-type slot/port
3. ip address ip-prefix/length
4. ip router ospf instance-tag area area-id [secondaries none]
…”
A. OSPF process ID
Correct answer.
B. OSPF MD5 authentication key
Wrong answer.
C. OSPF stub flag
Wrong answer.
D. IPv6 address
Wrong answer.
E. OSPF area
Correct answer.
THAT IS IN CORRECT. they need an ip so they can be part of the DR/BDR process if they dont have a router id. (which is not one of the options) because "process id is only "locally" important.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/xe-3s/iro-xe-3s-book/iro-mode-ospfv2.html#GUID-C7538EF0-66B0-4F5A-896D-ED91EE5BC3CC
Enabling OSPFv2 on an Interface
SUMMARY STEPS
1. enable
2. configure terminal
3. interface type number
4. ip ospf process-id area area-id [secondaries none ]
5. end
6. show ip ospf interface [type -number ]
step 4 requires both a process ID and area ID
An IPv6 address will not work as OSPFv2 runs over IPv4 only.
https://www.networkworld.com/article/2298648/chapter-9--ospfv3.html#:~:text=Another%20similarity%20to%20the%20relationship%20of%20RIPng%20to%20RIPv2%20is%20that%20OSPFv3%20is%20not%20backward-compatible%20with%20OSPFv2.%20So%20if%20you%20want%20to%20use%20OSPF%20to%20route%20both%20IPv4%20and%20IPv6%2C%20you%20must%20run%20both%20OSPFv2%20and%20OSPFv3
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