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EIGRP & OSPF Questions 2

February 1st, 2021 Go to comments

Question 1

Explanation

Broadcast and Non-Broadcast networks elect DR/BDR while Point-to-point/multipoint do not elect DR/BDR. Therefore we have to set the two Gi0/0 interfaces to point-to-point or point-to-multipoint network to ensure that a DR/BDR election does not occur.

Question 2

Question 3

Question 4

Explanation

The “network 20.0.0.0 0.0.0.255 area 0” command on R2 did not cover the IP address of Fa1/1 interface of R2 so OSPF did not run on this interface. Therefore we have to use the command “network 20.1.1.2 0.0.255.255 area 0” to turn on OSPF on this interface.

Note: The command “network 20.1.1.2 0.0.255.255 area 0” can be used too so this answer is also correct but answer C is the best answer here.

The “network 0.0.0.0 255.255.255.255 area 0” command on R1 will run OSPF on all active interfaces of R1.

Question 5

Question 6

Explanation

We must reconfigure the IP address after assigning or removing an interface to a VRF. Otherwise that interface does not have an IP address.

Question 7

Explanation

By default, EIGRP metric is calculated:

metric = bandwidth + delay

While OSPF is calculated by:

OSPF metric = Reference bandwidth / Interface bandwidth in bps

(Or Cisco uses 100Mbps (108) bandwidth as reference bandwidth. With this bandwidth, our equation would be:

Cost = 108/interface bandwidth in bps)

Comments
  1. cert
    April 4th, 2021

    ADMIN….. please explain the Q 4 ….. if you look at it technically all options are correct and all options would include the interface IP the is required .

  2. ali
    April 13th, 2021

    i cant see any questions ??
    i just see the answers

  3. Cyrus
    April 28th, 2021

    @cert… you are correct but best practice is to do an exact match when doing route advertisement, if not a summary route. So answer C has the most exact match to the interface as the wildcard is 0.0.0.0 requires the address to match exactly.

    The origina configuration did not match because the range was 20.0.x.x where x.x is any number but the interface had 20.1.x.x instead.

  4. jsnat
    July 1st, 2021

    Question 4
    20.1.1.2 0.0.255.255 will start the process on all interfaces and R2 can have other interfaces that are not part of area 0
    20.1.1.2 255.255.0.0 wrong syntax, but router will reverse it and the result will be same as the above
    20.1.1.2 0.0.0.0 will start the process with area 0 on this particular interface
    20.1.1.2 255.255.255.255 will start the process with area 0 on ALL interfaces – same 0.0.0.0 255.255.255.255 statement as on R1

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