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| yuvalkoen 2003-09-18, 5:40 am |
| first of all i sorry about my English.
I have the question:
Wich of the following if addresses can be assigned to host devices (choose two)?
a. 205.7.8.32/27
b. 191.168.10.2/23
c. 127.0.0.1
d. 224.0.0.10
e. 203.123.45.47/28
f. 10.10.0.0/13
answer is: B and F
i don't understand why F is a correct answer. because it is a private address and it is class A, so how can i do subnetting to class a?
thank you | |
| martek 2003-09-18, 10:55 am |
| You can subnet private addresses, whether they are A, B or C class. The same subnetting principles apply to both public and private addresses.  | |
| Demijohn 2003-09-18, 12:29 pm |
| Another way to look at it like this:
A is the address for a subnet, (host bits are 0 0000)
B is a host address (host bits are 0 0000 0010)
C is the reserved loopback address
D is a reserved multicast address
E is a broadcast address for a subnet (host bits are 1111)
F is a host address (host bits are 010.....0)
D | |
| yuvalkoen 2003-09-18, 1:23 pm |
| what is the network and broadcast addresses for 10.10.0.0/13? How much subnets and host available and what is the range?
but i can't do subnetting for public address from class A, right?
thank you | |
| martek 2003-09-18, 5:33 pm |
| You can subnet whatever you like, whether it's public or private, A, B or C class.
For 10.10.0.0/13 the answers are:
Subnet ID: 10.8.0.0
Broadcast address: 10.15.255.255
Valid IP range: 10.8.0.1 - 10.15.255.254
Number of subnets: 32 (2 of those reserved)
Number of hosts/subnet: 524288 (2 of those reserved per subnet)
I'll let you figure out the math. | |
| Demijohn 2003-09-18, 5:37 pm |
| You asked : but i can't do subnetting for public address from class A, right?
Why not? people do it all the time. You can subnet it. You just can't route it out on the public internet.
For 10.10.0.0/13 subnet address is 10.8.0.0,
broadcast address is 10.15.255.255, address range is 10.8.0.1 through 10.15.255.254. Total number useable addresses is (2**19)-2. | |
| yuvalkoen 2003-09-19, 6:23 am |
| but I learned a table of class A and B, but i didn't see something about class A. Somebody can give me please the table (with: # of bits, subnet mask, subnet, host, range) about class A? and if not, if somebody can write howcan i calculate the table of class A.
thank you very much. | |
| Demijohn 2003-09-19, 9:35 am |
| Memorizing a table is fine, but you need to learn how to subnet. The rules are the same regardless of class.
Check out this link:
http://cisco.com/warp/public/701/3.html | |
| yuvalkoen 2003-09-19, 10:50 am |
| you right, thank you.
i have another question:
1. There is a different between inter-vlan and vlan?
2. can be situation that in the first time the exam is easy and in the second time the exam is difficult?
3. i have the question:
Wich of the following addresses would require the use of the ip subnet-zero command?
A. ip= 131.64.16.133, mask= 255.255.255.128
B. ip= 192.168.36.10, mask= 255.255.255.0
C. ip= 156.100.11.37, mask= 255.255.240.0
D. ip= 205.100.16.3, mask= 255.255.255.0
the answer is C but i don't understand why. Somebody can say me why does C is the correct answer?
thanx | |
| martek 2003-09-19, 11:31 am |
| 1. A VLAN is a virtual LAN while inter-VLAN would mean most likely traffic between VLANs.
2. It depends how well you are prepared and the type of questions you get. If you get questions you're well prepared for, then the exam might seem "easy". If you're not, then the exam will seem "hard".
3. The answer is C cause 156.100.11.37 belongs to subnet zero. The first subnet is 156.100.0.0 (subnet zero) with IP range 156.100.0.1 to 156.100.15.254. So for the router to use IP 156.100.11.37 the command 'ip subnet-zero' should be used.
I hope this helps. | |
| Demijohn 2003-09-19, 11:54 am |
| I apologize if my last post seemed dismissive, but memorizing a table isn’t enough. But if you think it will help, here are the first few lines. Figuring out the rest is a good exercise:
Class A Effective Effective
# bits Mask Subnets Hosts
------- --------------- --------- ---------
22 255.255.255.252 2**22 – 2 (about 4 million) 2
21 255.255.255.248 2**21 – 2 (about 2 million) 6
20 255.255.255.240 2**20 – 2 14
regarding your other questions:
1 – Remember that Inter VLAN traffic requires a router
2 – Yes, It depends on what you know and what questions you get. Best bet is to be ready for anything
3- see Martek answer | |
| yuvalkoen 2003-09-19, 11:54 am |
| i don't understand why a,b and d is incorrect answers. can you help me with this?
when i said that the exam is "easy" or "difficult", i mean that i afraid that in the next time the exam will be more difficult then the previous. What is the maximum number of simulators that i can get?
thanx | |
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| martek 2003-09-19, 10:13 pm |
| A. IP 131.64.16.133, mask 255.255.255.128 - the IP does not belong to subnet zero so 'ip subnet-zero' is not required.
B. IP 192.168.36.10, mask 255.255.255.0 - same answer as A.
C. IP 156.100.11.37, mask 255.255.240.0 - the IP belongs to subnet zero so 'ip subnet-zero' is required.
D. IP 205.100.16.3, mask 255.255.255.0 - same as A and B.
I suggest you read up on what subnet zero is and what the 'ip subnet-zero' command does. Here's my post on subnet zero from another thread http://www.examnotes.net/article1022083.html | |
| yuvalkoen 2003-09-20, 3:13 am |
| thanks all of you
somebody can links me to page that learn TCP\IP? | |
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| http://www.learntosubnet.com/
http://www.learnTCPIP.com/
...and a lot of information on www.cisco.com (search about keywords) and other sites (found on google)....
Demijohn said:
quote:
but memorizing a table isn’t enough
and he is quite right! 25% of your ccna questions will be IP addressing and Protocols related. So, try to understand the general guiding rules!!! |
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