CCNA Practice Exam - OSPF Qn.1

Dubuku57Dubuku57 Member Posts: 81 ■■□□□□□□□□
in CCNA & CCENT
Got this from the practice exam here..

1. You are configuring OSPF on a router with three interfaces with the IP addresses listed below. Which of the following network commands would include all three interfaces in the OSPF routing process in a single area? (Choose all that apply)

Ethernet0 - 192.168.1.2 255.255.255.0
Ethernet - 192.168.2.2 255.255.255.0
Serial1 - 172.16.3.2 255.255.255.252
[SIZE=-1]a. network 0.0.0.0 255.255.255.255 area 0 [/SIZE]
[SIZE=-1]b. network 192.168.0.0 0.0.255.255 area 0[/SIZE]
[SIZE=-1]c. network 255.255.255.255 0.0.0.0 area 0[/SIZE]
[SIZE=-1]d. network 192.168.1.2 0.0.0.0 area 0
network 192.168.2.2 0.0.0.0 area 0
network 172.16.3.2 0.0.0.0 area 0[/SIZE]

Why is b. not correct also?Pls explain? THnkas!!!
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Comments

  • networker050184networker050184 Mod Posts: 11,962 Mod
    Because B would not match the serial link.
    An expert is a man who has made all the mistakes which can be made.
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  • billscott92787billscott92787 Member Posts: 933
    1. You are configuring OSPF on a router with three interfaces with the IP addresses listed below. Which of the following network commands would include all three interfaces in the OSPF routing process in a single area? (Choose all that apply)

    Ethernet0 - 192.168.1.2 255.255.255.0
    Ethernet - 192.168.2.2 255.255.255.0
    Serial1 - 172.16.3.2 255.255.255.252
    a. network 0.0.0.0 255.255.255.255 area 0
    b. network 192.168.0.0 0.0.255.255 area 0
    c. network 255.255.255.255 0.0.0.0 area 0
    d. network 192.168.1.2 0.0.0.0 area 0
    network 192.168.2.2 0.0.0.0 area 0
    network 172.16.3.2 0.0.0.0 area 0



    Well look at it this way. We have 192.168.1.2 Eth0 and 192.168.2.2 Ethernet and 172.16.3.2 Serial1 Interface


    b. states network 192.168.0.0 0.0.255.255 area 0

    This means that it is going to include 192.168.0.0 - 192.168.255.255 in the 0 area. So, we would not include the Serial1 interface which is 172.16.3.2
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  • JavonRJavonR Member Posts: 245
    How is option D a correct choice? That IP address and wildcard mask certainly don't include 172.16.3.2...[SIZE=-1]
    [/SIZE]
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  • drew2000drew2000 Member Posts: 290
    Answer D has three networks, so the combination of all 3 fits the bill.

    Drew
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  • blackninjablackninja Member Posts: 385
    Unless I'm getting rusty the answer is also:

    a. network 0.0.0.0 255.255.255.255 area 0

    The wildcard mask 255.255.255.255 means it doesn't care about the 32 bits, so the statement matches all the ip addresses.
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  • JavonRJavonR Member Posts: 245
    drew2000 wrote: »
    Answer D has three networks, so the combination of all 3 fits the bill.

    Drew

    Ahh woops, I thought those were the unmentioned e and f icon_lol.gif.
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  • drew2000drew2000 Member Posts: 290
    JavonR wrote: »
    Ahh woops, I thought those were the unmentioned e and f icon_lol.gif.

    Me too the first time through!

    Drew
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  • Dubuku57Dubuku57 Member Posts: 81 ■■□□□□□□□□
    Thanks everyone! (a) and (d) are the answers indeed. Think i hadnt read the question correctly.
    Drew, Javon I made that mistake too! =S
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