Questions About Certain Network+ Topics (N10-006 Failed!)
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I just took the Network+ N10-006 and failed just 4 questions shy from passing. I would like to know if you guys could help me out with some topics just so I could refresh my memory. These are from certain scenario based questions. The first one is:
I have 4 networks with hosts given to a class c /24 block:
Network A - 35 hosts
Network B - 67 hosts
Network C - 12 hosts
Network D - 30 hosts
The question asks me to write down the CIDR notation for each of the networks. That's the easy part and I think I got that right. The other question was to find out what the largest contiguous ( or continuous) block was for the remaining hosts. I don't understand what that question means. Could anyone of you help explain what "largest contiguous block" is?
The second question that I had trouble with was setting up wireless APs. It's recommended that each AP connecting to a central switch use channels 1,6, or 11 for 802.11b/g, correct?
AP1=1
AP2=6
AP3=11
If one AP has speed and duplex set to say 100Mbps and half duplex and the other APs set to auto speed and duplex, I shouldn't put the 1st AP with AP 100 to auto, correct? They had me in the question using a Cisco IOS screen and I was a little confused with that screen. They had the available commands as show interfaces. I guess I should have put the speed and duplex for each of the APs as shown in the show interfaces command.
The last question had pairs of wires and some pairs like 3 and 6 were set to short. I should have used an cable certifier for checking that result, correct? I don't think I would've used and OTDR because OTDRs don't check pairs of wires.
Anyways, that's it for now. Wish me luck on the retake! -
@Ponciana-S-Pajela said:
I just took the Network+ N10-006 and failed just 4 questions shy from passing. I would like to know if you guys could help me out with some topics just so I could refresh my memory. These are from certain scenario based questions. The first one is:
I have 4 networks with hosts given to a class c /24 block:
Network A - 35 hosts
Network B - 67 hosts
Network C - 12 hosts
Network D - 30 hosts
The question asks me to write down the CIDR notation for each of the networks. That's the easy part and I think I got that right.Network A = /26
Network B = /25
Network C = /28
Network D = /27The other question was to find out what the largest contiguous ( or continuous) block was for the remaining hosts. I don't understand what that question means. Could anyone of you help explain what "largest contiguous block" is?
If you add up the hosts for the 4 subnets 35+ 67 + 12 + 30 = 144 hosts (out of 254 possible in a /24 network). The largest contiguous block that you could get here would a NetworkE with a /25 (126 hosts)
The second question that I had trouble with was setting up wireless APs. It's recommended that each AP connecting to a central switch use channels 1,6, or 11 for 802.11b/g, correct?
AP1=1
AP2=6
AP3=11yes, correct
If one AP has speed and duplex set to say 100Mbps and half duplex and the other APs set to auto speed and duplex, I shouldn't put the 1st AP with AP 100 to auto, correct? They had me in the question using a Cisco IOS screen and I was a little confused with that screen. They had the available commands as show interfaces. I guess I should have put the speed and duplex for each of the APs as shown in the show interfaces command.
I cannot say that I know the answer for sure but here is the best practice:if the devices are infrastructure devices, you hard code, manually set, configure both speed and duplex. If the devices are client devices, then auto set is what you want to do for those. So I believe I would have hardset the others instead of changing the set one to auto.
The last question had pairs of wires and some pairs like 3 and 6 were set to short. I should have used an cable certifier for checking that result, correct? I don't think I would've used and OTDR because OTDRs don't check pairs of wires.
You're looking for a cable tester that is also known a wire-map tester. These are commonly found in multifunction cable testers.
Anyways, that's it for now. Wish me luck on the retake!
Take your exam results and work from them on exam objectives. Concentrate more on the objectives you missed more often. It sounds like you didn't miss by much. You'll do fine by focusing on your weak areas.
Cordially,
Ronnie Wong
Host, ITProTV -
A few extra comments:
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Always be sure the speed/duplex of the two connected devices are either both manual or both auto. Subtle problems can crop up if one end is manual and one auto. I agree with Ronnie for the best practice: use manual for infrastructure devices and auto for client devices.
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OTDR means Optical Time Domain Reflectometer; they are used for testing fiber cables. They won't work on copper cables! You can get a TDR for copper cables, and it would detect a short. But they expensive (a good one is thousands of dollars) and are mostly used for checking long runs (telcos and cable companies use them all the time). For the limited distances of copper Ethernet, a much cheaper cable tester is sufficient.
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Good luck on the retake!
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The other question was to find out what the largest contiguous ( or continuous) block was for the remaining hosts. I don't understand what that question means. Could anyone of you help explain what "largest contiguous block" is?
If you add up the hosts for the 4 subnets 35+ 67 + 12 + 30 = 144 hosts (out of 254 possible in a /24 network). The largest contiguous block that you could get here would [be a network] with a /25 (126 hosts)
I interpret the question as provided a Class C network (/24), what is the largest subnet after allocating the previously determined subnets (one of each: /25, /26/, /27, and /28). A /28 subnet (with 14 possible hosts) is the largest remaining block of the Class C, and completes the allocation of subnets for the entire /24 space. Of the results, the two /28 networks are adjacent to each other, that pair is adjacent to the /27 block, which as a group are adjacent to the /26 subnet, which as a group are half of the Class C network opposite the /25 subnet.