Share your ICND1 Experience
Please share with us your experience after taking the exam ICND1, your materials, the way you learned, your recommendations…
Please don’t post links to copyrighted work here!
Please share with us your experience after taking the exam ICND1, your materials, the way you learned, your recommendations…
Please don’t post links to copyrighted work here!
@xallax, thx for the lab.
Thanks a lot D. B and An.
Tried the ICND1 today. Just like Terpsfan I scored a 799 and did worst on WLAN questions.
So basically I must have screwed up on about a single question, and the sad part is that I saw a mistake I made just after I clicked next, so if I hadn’t done that, then I would probably have scraped through and gotten my CCENT on the first try.
Now at least I have some idea where my knowledge is lacking, and I can study harder on those fields before I try again.
100% Implement and verify WAN links
89% Implement a small switched network
79% Describe the operation of data networks
67% Implement an IP addressing scheme and IP services to meet network requirements for a small branch office.
67% Identify security threats to a network and describe general methods to mitigate those threats
60% Implement a small routed network
33% Explain and select the appropriate administrative tasks required for a WLAN.
So yeah. definetely gonna study hardest on the topics I scored below 75% on.
At least time was no issue for me. I took my time with every question and was left with an hour to spare when I was done. I made up my mind about each answer before proceeding, but sadly, once or twice I kinda stared at the screen for minutes on end to no avail, only to realize the mistake right after clicking next.
@darkplayer no problem
@Ratbear upload on Mediafire or Filefactory. thanks for thinking about sharing
Question. You have been hired by Web Enterprises corporation to document the layoutof the network. Complete the following tasks.
Router Int=Fa0/0.
Router=Int =Fa0/1.
Router=Int=S0/0.
Router=Int=S0/1.
192.168.100.2/24
192.168.5.2./24
192.168.223.2/24
192.168.54.2./24
Do you know this answers. thx your help.
Question: You have been hired by PC Consultants incorporated to document the layout of the network.
Router Int=Fa0/0. ?
Router Int = Fa0/1. ?
Router Int=S0/0.?
Router Int=S0/1.?
192.168.69.2/24
192.168.157.2/24
192.168.30.2/24
192.168.218.2124
please rephrase the question and i believe there should’ve been a picture attached to this.
Which of the following describe Class A host addresses? (Choose three.)
A. The decimal value of the first octet can range from 1 to 126.
B. The decimal value of the first octet can range from 1 to 192.
C. The first octet represents the entire network portion of the address.
D. The default subnet mask for a Class A network is 255.255.0.0.
E. The value of the first binary place in the first octet must be 0.
F. The first two binary bits of the address must be 00.
Question. Drag the description on the left to the correct term on the right.
(1)A store and forwarded application that allows users to send messages and files in a timely manner.
(2)Allows two or more people to simultaneously crate and or modify a body of work.
(3)Allows access to the internet through a common interface to look up information or retrieve data.
(4) a cryptographic protocol that provides secure communications on the internet.
(5) a structure collection of records in a central location.
(6) provides the capability to remotely access a command prompt on a remote system.
This are place to match.
Email (?) Web Browser (?) Telnet (?) Collaboration (?) Database (?)
Select three options which are security issues with the current configuration of Switch.A. (Choose
three.)
A. privilege mode is protected with an unencrypted password
B. inappropriate wording in banner message
C. virtual terminal lines are protected only by a password requirement
D. both the username and password are weak
E. telnet connections can be used to remotely manage the switch
F. Cisco user will be granted privilege level 15 by default
1st question:
A, C, E
2nd question
(1) – email
(2) – collaboration
(3) – web browser
(4) – possible answer: HTTPS
(5) – database
(6) – telnet
3rd question
please provide the output of *show running-config*. can not answer this without seeing that.
I am having problems post images on here. i can’t copy and past. i tried convert JPEG to word but that didn’t work ether. as soon as i figure it out. i will post here.
thanks for your help.
you’re always welcome. upload to imageshack or a similar image hosting websie and post the link here.
http://imageshack.us/photo/my-images/84/unleden.jpg/
http://imageshack.us/photo/my-images/89/26195044.jpg/
you have to do show run and show cdp nei.
here’s the solution:
https://www.9tut.net/icnd1/labsim/implementation-sim
Ping command
———————–
Destination unreachable : which layer problem and why?
Request Timeout : Which layer problem and why?
Could you please help
@ Ranyhyn & Ratbear
Do you have an implementation sim question that needs configuration? like configure IP and passwords?
@Niraj
request timeout: it got to a certain point on the internetwork and a device in-between replied that it did not receive a confirmation of receipt from the next point along the way to the destination. this is a Layer3 protocol (ICMP), the problem could be L1, L2 or L3 (cable disconnected or malfunctioning, encapsulation mismatch, routing protocol incorrectly set…)
long story short: something isnt functioning right on the internetwork.
http://www.brainbell.com/tutorials/Networking/The_Request_Timed_Out_Message.html
destination unreachable: it’s a message you get if your packet is intended for a device on an external network and it can’t leave towards that point
http://en.wikipedia.org/wiki/ICMP_Destination_Unreachable
hope it answers your question
I tested today and scored a 850…completed ICND1 exam with 40 mins remaining.
Listed below were on my ICND1 exam and I used 9tut to study:
– Implementation SIM
– Show Configuration SIM
– Security Testlet (they asked to select security issues;3 for Switch and 2 for the Router
– Operations SIM
– Each of the Drag and Drop
Had 3 wireless questions. PLEASE be sharp on Subnetting
I’m telling you if you really study the 9TUT Sims you will have no problems correctly answering the sim exam questions, it got me through.
So, Study and prepare well and you’ll do fine and pass.
Remember to breathe and take your time…good luck.
The most important – pay attention while using GU examination interface – almost cost me a lot, as I pressed a button NEXT to another question after just first of four tests was done – scroll bar was not visible and I was in rush.
Othervise it is not complicated but did take some time to rich the point of subnetting in head – no pen or paper;
I passed with preliminary 899, but the most important and first testlet i skipped – by mistake. Now I’ve been waiting for 72 hours until Cisco send me the final score.
All above mentioned was on test and I studied VCE CertifyME from May-2011 for .822
plus finished Cisco Academy. Now I see, since I’ve found 9tut that was not that necessary to spend money, as it’s possible to learn many things from CBT, LAmmle, 9tut and VCE – and for passing the exam topics are well explained. Plus – people are honest and supportive.
However – study hard and let the knowledge to digest first.
Thanks 9tut for giving the real meaning to the technology that we are study here.
Go internet go !!!
Now – go for ICND 2.
@ Tennis June and Detence
Is your implementation Sim with configuration or drag n drop only? thanks
nic: everything that came in the exam appeared in here. another good tool is to download the latest version of testking. It help me a lot.
i passed today icnd1 with 950/1000!!!
thanks 9tut!!!!
3 of the sims where here.
i also studied cert killer
cbt nuggets
and all vce’s
straight to icnd 2 now!!!!
Hi friends all over the world.
I have few days left for my exam can someone share me with practise exam like testking or certkiller and Vce’s . my email is mikesesay2000@yahoo.com. Thanks in Advance.
The network administrator is configuring a Cisco router. The prompt on the screen is:
Router(config-if)#. What is true of this prompt? (Choose three.)
A. An interface password can be set at this prompt.
B. Settings that affect all router interfaces can be globally configured at this prompt.
C. An interface can be activated or deactivated from this prompt.
D. The administrator will arrive at this prompt by typing interface fa0/0 from the global
configuration mode
E. The administrator will arrive at this prompt by typing configure terminal from the EXEC prompt.
F. An interface IP address can be configured at this prompt.
C,D,F
xallax
June 2nd, 2011
how do i open the pkt file extension. wat software do i need to install to run this files. please help asap
@ me dferra
You need packet tracer. I believe it is only legally available to past or present Cisco Acacdemy students.
Which dumps is actual for this days?
Hi guys,
please can yuo tell me the minimum score to pass this exam??I try to search it, but some site tell 850/1000 and other 805/1000…Help me please, i had the exam on 30/06…Thank you to all….
when i took the icnd1 exam it was 804/1000. i got 1000/1000. dont focus on getting the minimum score, focus on mastering the exam!
Passed today from riyadh/ksa with 962/1000 missed 2 qts,thanks a tons to 9tut.net,ExamCollection.com,CBT Nuggets by Jeremy Cioara,ICND Modules(1 to 6) from cisco.com and special thanks to Cisco.TestKing.640-822.v2011-04-18.by.AttaullahShahid.513q.vce (Examcollection.com).
Important Advice Subnet Subnet Subnet learn subnetting with as much practice as you can and try to solve the subnet qts just by looking at the netmask.Now Looking forward to ICND2.Good Luck for all ICND1 Exam takers.
Thank xallax..
I try to get 1000/1000, but is important know how much is the minum score to pass the exam :)…I’m studing very much, with testking test, actual testandpackettracer lab…i hope to pass my exam!!!Thank you!!!
ehmyway could u please me send me those materials on my email mikesesay2000@yahoo.com. i will be grateful if u will do that for me. thanks in advance.
ehmyway i need ur help bro. send me d code bro…on vce cisco.TestKing.640-822.v2011-04-18.by.AttaullahShahid.513q.vce (Examcollection.com)
Passed todat 825 from Japan. had the security sim the switch and the router, cdp sim, show sim. All the same procedures as here. 9tut was a big help.
dora , drag and drop arp.dhcp etc.
some new questions.
router pings a server but is only 60% then the next time it is 100%.
because of NAT , Needs to check the Routing table or congestion ????
another about hops I think.
Thanks
also something about
THANKS A LOT 9TUT!!!!!
I pass today 899/1000
I had the security sim,cdp sim, show sim….
drag and drop DORA,
……………………………………………..
Email – Send messages back and forth
Collaboration – multiple users updating simultaneously
Database – a collectio of records stored in a central location
Web Browser – Application for internet servers.
………………………………………….
Point to Point – Lease Line
Circuit Switched – PSTN
Packet Switched – Frame relay
Cell Switched – ATM
………………………………………….
the drag and drop with passwords(1st on dnd page)….
i had the question with router pings a server but is only 60% then the next time it is 100%
i answered something with congestion(if i remember correct)
Try to study testking vce….they are very helpfull!!!
thanks again!!!!!!!!!!!
does any one know this answers?
June 20th, 2011
The network administrator is configuring a Cisco router. The prompt on the screen is:
Router(config-if)#. What is true of this prompt? (Choose three.)
A. An interface password can be set at this prompt.
B. Settings that affect all router interfaces can be globally configured at this prompt.
C. An interface can be activated or deactivated from this prompt.
D. The administrator will arrive at this prompt by typing interface fa0/0 from the global
configuration mode
E. The administrator will arrive at this prompt by typing configure terminal from the EXEC prompt.
F. An interface IP address can be configured at this prompt.
I think the best answer for this question is A, C, F
A) you can not set an interface password…
B) from that prompt you can work on only one physical interface, not all interfaces
C) you can enable or disable the interface (enable or no enable). TRUE
D) TRUE
E) the prompt would’ve been Router(config)#. FALSE
F) you use the command ip address IP SUBNET. TRUE
C, D, F.
How much CISCO charging now for ICND 1 test now ..??
Hey All, I need all the help I can get , please. I took the exam and failed and I remember one particular question that I know kicked my butt and for the life of me I can not figure what I did wrong. I oped a window and it gave the instructions of what to expect that to score maximum points you have to perform all tasks on both the router and the switch. You have to choose 2-3 tasks on the router and then choose 3-4 tasks on the switch. UYou then click on a different window and there is the router on the left and the switch on the right. So I choose Banner Motd, A password and some other task for the router and then clicked on the router and the CLI opens and you have to perform the tasks that you chose and whatever I did NOTHING worked. So not to lose any more time I skipped over to the switch chose my tasks and same thing- nothing worked. Can anyone who remembers this please tell me what I am doing wrong… ANY HELP??
@ BIGD
This sounds like the security sim. Alls you do is use the sh run command to find the answers to the question. You do not have to configure anything on the router or switch.
By the way I passed the exam today with a 974. Thanks to everyone that contributed to this site.
Thanks, Me. You have no idea how long I have beeb trying to figure this out. After you find the answers from doing SHOW Run, do you have to type in the correct answers? I remember the MOTD task where it says Welcome to Router A.. DO you change it to No Unauthorized Access. Also, the Weak Passwords task, do you have to change it to a stronger password? If so, I didn’t notice where they want you to find the passwords they want you to use.
If anyone feels generous and wants to share their Packet Tracer please send download to bigd999@carolina.rr.com Thank a Million
I failed my Exam ICND ! exam today my mark was 712/804. but i will go for it again. wlan and subnetting was my greatest problem but I won’t give up. I lack sample questions.. could someone help me with sample questions?? Goodluck to next exam taker. thanks my email is mikesesay2000@yahoo.com
@BIGD
You should just have to select the correct multiple choice answers no configuration. At least that is what was required for my exam.
@WALEED 125 dollars.
God bless you guys from 9tut
I scored 975 tonight! Wow, i started to smile when the test begun.
ALL the questions from 9tut were there. I said ALL! Security sim, LABsim, the testlets, drag and drop, DHCP DORA… Was a very easy test, yes. But i studied hard. Read Wendell Odom and Todd Lammle books, CBT Nuggets, Packet Tracer (a lot) and use the latest VCEs and you will do fine too. I already started to study for ICND2… Thanks 9tut!!!
emachadorj could u please help me with the latest VCEs? my email is mikesesay2000@yahoo.com Bro I won’t give I wanna go for it again. Guys ur help will be highly appreciated. thanks in advance
Me, thanks again for getting back, I don’t mean to keep asking and going over this question, but when you clicked on the router and switch didn’t the CLI open up? I do remember that when you had to choose 2 things for the router and 3-4 things for the switch there were small boxes next to each one. Maybe your right, you just have to check off the answers you want. Then why does the CLI open if you click on the devices? I keep going back to that….
What are the VCE”S?? I keep seeing people talking about VCE. Can anyone explain this to me please.
this is the first link i see on google after typing “VCE”…
http://www.visualcertexam.com/vce-testing-system.html
it’s a testing system that helps you get familiar with questions
guys pray for me i have n exam after 3 hours m just going frm ma place plz do pray for me i have icnd1 exam
Anonymous sure bro u will make it….. I’ll put my fingers across for u.. just be confident…
How do you know which exams are ICND1 exams on Examcollections, Im not sure how it works. I went on there and all I saw were screenshots, don’t get it.
hey guys i couldnt pass my icnd1 exam as i men tioned above that m just going to give an exam any how m really tensed will giv again hope i will do it
@BIGD
look for the exam code: 640-822
http://www.examcollection.com/640-822.html
may i get some help hw can i pass my exam plzzzzzzzzzzzzzzzzzz i have purchased p4sure dumps online and i gave the exam i couldnt passed nw wat should i do may i get some helpppp plzzzzz
@umair
this site helps you LEARN. the certificate has no value if you do no understand the concepts.
read the book, i recommend todd lammle’s book. watch video, i recommend cbtnuggets videos.
don’t cheat the exam, you’re only cheating yourself.
I know it’s 640-822, but I am unable to open the download all I get is a small little pic in the middle. Whatever, as usual thank you all you wonderful people. Going to set a date for my next ICND1 exam, after going through this fantastic site my confidence grew 100 %. GO ICND1 WHEWWW.
Passed ICND1 with 962/1000 a few days ago. The exam was easier than I thought it would be. I was using official Cisco Press ICND1 book by Wendell and CBTNuggets by Jeremy and I did a lot of configuration in Packet Tracer and GNS3.
My advice for exam takers. Know subnetting and how networks work (OSI Layer 2 and 3 at least). Get familiar with CDP and port-security. And subnetting, and subnetting, … 🙂
Sam, where did you get Packet Tracer from?
I passed Icnd 1 with 987/1000 yeasterday ….Now ready for icnd 2.
examcollection.com and 9tut is really helpful.just go through it.and you will pass in first attempt.but important thing is that you have to understand every concept….
thank you website author and other friends…..it’s worth it…..
can anyone explain how to open files in examcollection? I have tried numerous times and I go to the site click on one of the tests and it does not open. any help??
I just passed ICND 1 with a 912.
Like the previous people stated that the LABSim and Security Testlet questions was on there.
There were a lot of questions that came from the latest TestKing from the examcollection.com
@bman
Sorry for the delay man. I used the VCES only for training. The real deal was the CBT Nuggets and the books. Packet tracer 5x is a very important tool for exam preparation. Of course the 9tut questions helped a lot…
Can someone PLEASE explain how to use Examcollection? I downloaded the software and I am somewhat lost how to use it afterwards. If someone can explain it to me I would appreciate it.
@bigd
you download the setup, install the program.
you then look for exam practice files (aka VCEs), you download which file you wish, double click on it. that’s it.
Any question in ICND1 from WLAN…..
I passed my ICND1 today. Thank you 9tut. All the sims and testlets on this site helped a lot.
@BIGD: Packet Tracer is available at Cisco site, or (as I did it) on the torrents.
Sam, thanks for getting back, but you lost me as far as Torrents
Passed the ICND1 exam yesterday with 862. Do understand why the answer is correct as in the real exam the labs are using different ip’s and so on. The security testlet is having more questions now. I saw 100% score on security for me, so I must have been correct in my answers. Did not choice MOTB answer for switch/router. One question with 802.11w. Did not know about that one. Questions with IDS and DHCP (Dora) where there too.
Just passed with a 825!! I did get the security question. This website, ExamCollection and a good understanding of subnetting are the key.
C-Cuned– I can not open the tests on ExamCollection, what do you use to open the exams?
anyone have dump for ICND1 ? could you point exactly file name and share with us. i go to take exam in next week.
@BIGD: Packet Tracer is available on Cisco site for download (as I remember), and your can open for example torrentz.eu site, input “Packet Tracer” and there you go (all you need is a good torrent client – uTorrent for example).
@Cheat: Why are you trying to be a Cisco certificated if you are not interested in the networking field? There is no point of having a certificate, if you lack a proper knowledge. This is like wanting to become a marine biologist or vetenarian and being afraid of animals – there is no point.
I guess the majority of people on this site are taking Cisco exams, so they (including me) can get a better paid job. But what good will it do, if you won’t be able to maintain and troubleshoot a network – you will get fired sooner or later, and you could bitch around that you *have* a certificate, but in the end, you know shit about how network work.
So, in my opinion, if you want to become CCENT or greater, first try to learn this stuff and then when you think you are ready for the exam, read some online questions, go through the exams on this site, but don’t memorize them, try to understand them.
You know, to become a CCENT, CCNA or CCNP you only need to take five steps, which are:
1. LEARN
2. UNDERSTAND
3. CONFIGURE
4. VERIFY
5. TROUBLESHOOT
The key is UNDERSTAND!
For example, if you take this sim (https://www.9tut.net/icnd1/labsim/implementation-sim) there is no point of trying to memorize how to solve it, because in the real exam everything is mixed. It is easier to learn about CDP and how can it help when solving this kind of problems. And again, you have to understand stuff. If you cannot “dissect” the output of IOS command “show cdp neighbors”, you don’t understand the concepts, and that the whole point – understanding!
Good luck with your studies.
@MyNameIsSam: thank for your comment, to be honest my road map will become CCENT, CCNA, CCNP in next 2 years later. i was finished preparation but just need exactly dump which is most popular in the exam. i noticed a lot dump from internet like exam collection but it seem a lot and could identify which one are correct most.
@MyNameIsSam The Cisco exams are a total rip-off. I worked as a net admin for 10 years and out of nowhere my job mandated a CCNA. It is a money making scheme by Cisco. It took me a while to pass their rigged composite test. People should use every option at their disposal to pass these BS tests.
@Bryan: I agree that certification is a rip-off, but it could help you get a better paid job. For example, college tuition fees are a rip-off, but you have a higher chance to get a job with a college degree than without it.
And Cisco is not alone in this field. Microsoft, IBM, etc.. are the same. The only difference is that Cisco makes their certifications harder to get, and are thus more valuable to you and your future employer.
Agreed, I don’t know about anyone else, but I want to make sure that what ever I do I want to work hard for it. I don’t want anything handed to me. I feel better knowing that I busted my a** to work for what is mine and no one had to go out of there way to give it to me. As far as this site, I think it is fantastic, it helps people get a little further, so what if people posted the answers. I got hit with the security sim and for weeks I couldn’t find out what I did wrong and it literally drove me nuts and someone mentioned this site and sure enough here it was and I found out that I was studying for it the wrong way. So in essence, it corrected me because I would have went home again and studied for it again the wrong way. Don’t get me wrong, i don’t believe in cheating either, doesn’t get you no where and eventually it will catch up to you.
passed my icnd1 925. I usually run out of time fast, but briefly reviewing 9tut sim questions saved my a good 25 mins on the exam.
This information a great before test, see if you understand it material. You should not even take the test if all you are looking for if enough info to pass. What happens when you need to solve a real problem at work?
The material here works. I would expect to see these types of questions such as understanding how to use the CDP commands to create a network map.
So far I’ve read at least two books, used plenty of commercial programs including a network simulator. Also LABSIM which has some very good lessons. The stuff here just helps to get ready for the test, and more importantly to understand the different types of questions you will face. The four types, and the timing is something that you should know before waling into the test. Plenty of people lose out because they think the Sim’s and simlets, plus those multiple question questions are going to take too much time they rush through the simple multiple choice ones and lose valuable questions.
@BIGD: I totally agree. I missed some questions on CCENT exam, and I think is foolish of Cisco in that it does not tell you which questions were missed and what were the correct answers. Sometimes you can learn a lot from your mistakes.
Whats the best place to get CCND1 PDF file for theory purposes?
Brilliant website guys. Passed my CCENT yesterday, and this site helped me a lot. About 3-4 of the sims came off here and and 2 of the drag and drops. Going over these questions saved me about 20-30 min. Great stuff!
In ICND1 do you have to configur NAT or just understand the operation of PAT and NAT inside and outside addresses?
I understand NAT and remeber some of the steps to configur NAT get a bit confused with ACL.
@ maven
Can you specify what sims came out in your exam?
Thanks in advance…
Took the ICND 1 today and passed with a 920. Had 50 question with 4 sims/testlets altogether. Remember testlets count as ONE question not 4. All IPs on the exam were different from the “dumps” and sims you see online so you better know how to subnet fast on paper or in your head. Most subnetting was on Class C addresses so its easy to do in your head. I had the sims and testlets in the first half of the exam which took some time and I got alittle spooked when I saw the time running but the second half was so easy that in the end I had over 25 mins left.
There was a wireless Q Ive never seen before asking about 802.11 standards requesting 3 choices. Remember 802.11 has 14 channels NOT only 11. Also 802.11w is in fact one of the standards.
NAT sims are not part of ICND 1 but there were 1 or 2 basic questions, remember PAT uses TCP ports.
The sims are not exactly the same as u see here. The IPs are different and the drag-ins are scrambled. If you study them they are very easy when taking the test.
I think the most important thing to know about this test is if you CANT do class C subnetting in your head you might run out of time. No joke, learn to subnet in your head! You will thank me later.
@ Grimster
Congratulations for passing!
Is the implementation sim 2 in your exam or the implementation sim only…
Thanks
I just passed the icnd1 yesterday with 962! Dont have much of a background in networking. I prepared mainly from the cisco press books and the net for reference. All of the topics on the exams are in there. Need to sure of all the concepts. And I used this site and ariel vce a week before the exam. these really helped a lot!! helped me get an idea of the questions i would face on the exam… Many of the queestions are similar to the ones here. I would suggest to study the material first and then use this site to check ur concepts/knowledge a little before ur exam date. Thanks!!
@MyNameisSam – infosec managers are required (or should be required) to have a deep understanding of networking, so I’m getting a CCNA even though I never intend to do any network ops. That is one reason why people get the cert — the other reason being is some It jobs want you to have the cert even though very little of your job will be involved in network engineering. Where I live, a typical job posting wants a person to have a CCNA, MSCE (or MCITP), a BS in computer science, plus the sun, the moon and the stars…
hello, taking my icnd1 in 3 hours. holy poop.
@grimster – I don’t believe 802.11w is technically a wireless “standard”.
@grimster – okay maybe it is?
@ OMGIMNERVOUS, GOOD LUCK AND DON’T FORGET TO LET US KNOW HOW YOU MADE OUT & IF THERE WAS ANYTHING WORTH MENTIONING..
Dear 9TUT TEAM,
Am from singapore. Today i have attended the exam and passed with 887/1000. Thank you so much for ur great help to prepare the exam using this sites.
could someone help me with these subnetting problems
If an Ethernet port on a router were assigned an IP address of 172.16.112.1/25, what would
be the valid subnet address of this host?
A. 172.16.112.0
B. 172.16.0.0
C. 172.16.96.0
D. 172.16.255.0
E. 172.16.128.0
What is the subnetwork number of a host with an IP address of 172.16.66.0/21?
A. 172.16.36.0
B. 172.16.48.0
C. 172.16.64.0
D. 172.16.0.0