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Subnetting Questions

February 6th, 2017 Go to comments

Question 1

Explanation

Network A needs 120 hosts < 128 = 27 -> Need a subnet mask of 7 bit 0s -> “/25″.

Because the ip subnet-zero command is used, network 172.16.3.0/30 can be used.

Answer E “Link A – 172.16.3.40/30″ is not correct because this subnet belongs to MARKETING subnet (172.16.3.32/27).
Answer F “Link A – 172.16.3.112/30″ is not correct because this subnet belongs to ADMIN subnet (172.16.3.96/27).

Question 2

Explanation

Although all above answers are correct but 172.16.1.0/26 is the best choice as it is the most specific prefix-match one.

Question 3

Comments (4) Comments
  1. jasin
    March 6th, 2017

    You have been asked to come up with a subnet mask that will allow all three web servers to be on the same network while providing the maximum number of subnets. Which network address and subnet mask meet this requirement?
    A. 192.168.252.0 255.255.255.252
    B. 192.168.252.8 255.255.255.248
    C. 192.168.252.8 255.255.255.252
    D. 192.168.252.16 255.255.255.240
    E. 192.168.252.16 255.255.255.252
    any one please could explain how we goina work out for 3 web server

  2. skyflakes
    March 7th, 2017

    We want to have 3 host right or 3 web servers? so B is correct because of the subnet. 255.255.255.248 or /29. the increment of it is 8. 8 – 2 = 6 usable host, so it would fit the requirements,

  3. Aaron
    March 7th, 2017

    8 – 2 because we subtract the network id and broadcast id. So we could only use 6 host, unlike in letter C for instance is 255.255.255.252. so it’s 30. the increment is 4 so 4 – 2 = 2 host only, so it wouldn’t match the needed requirements for 3. i hope my answer is correct. :)

  4. Eriol
    March 9th, 2017

    Both Skyflakes and Aaron are correct (: because you need to use a mask of /29 to have 6 usable IP’s to configure your “3” needed host, the masks /30 only gives you 2 usable IPs which doesn’t meet the requirements of 3 hosts and the /28 mask gives you 14 usable IPs, which doesn’t fullfil the “while providing the maximum number of subnets” statement.