Suggested Answer:C🗳️
OSPF uses the following criteria to select the router ID: 1. Manual configuration of the router ID (via the ג€router-id x.x.x.xג€ command under OSPF router configuration mode). 2. Highest IP address on a loopback interface. 3. Highest IP address on a non-loopback and active (no shutdown) interface.
Ref: What is OSPF Router ID, OSPF Router ID Selection Algorithm and How to Configure OSPF Router ID - OmniSecu.com
“…
OSPF Router ID selection algorithm works as below.
o Any manually configured OSPF Router ID in OSPF Process is selected as the OSPF Router ID.
o If there is no OSPF Router ID configured, the highest IP address on any of the Routers Loopback Interfaces is selected as the OSPF Router ID.
o If there is no Loopback Interfaces configured, the highest IP address on its active interfaces is selected as the OSPF Router ID.
…”
A. 10.10.1.10
Wrong answer.
B. 10.10.10.20
Wrong answer.
C. 172.16.15.10
Correct answer.
D. 192.168.0.1
Wrong answer.
Because that is the address of the loopback interface.
upvoted 13 times
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