4 Comments on “what router ID will OSPF use for this router?”

1. Nick says:

   November 19, 2015 at 10:53 pm

   To select which router will become DR they will compare their router-IDs. The router with highest (best) router-ID will become DR. The router-ID is chosen in the order below:

   + The highest IP address assigned to a loopback (logical) interface.

   + If a loopback interface is not defined, the highest IP address of all active router’s physical interfaces will be chosen.

   In this question, the IP addresses of loopback interfaces are not mentioned so we will consider IP addresses of all active router’s physical interfaces. Router Corp-4 (10.1.40.40) & Branch-2 (10.2.20.20) have highest “active” IP addresses so they will become DRs.

   
   
   
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2. asdf says:

   January 26, 2016 at 11:39 pm

   loopback1 – 10.154.154.1

   
   
   
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   1. Miguel says:

      February 29, 2016 at 8:52 pm

      No, answer is 172.16.5.1 .. 172 is higher than 10

      
      
      
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3. ish says:

   February 29, 2016 at 11:38 am

   Non-volatile random-access memory (NVRAM) is random-access memory that retains its information when power is turned off (non-volatile) <– basically a default

   
   
   
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