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| djmaplethorpe 2004-01-22, 6:06 pm |
| I don't know why I can't figure this out.
With only the information given can some one answer this question for me:
PC1 and PC2 are on two different Ethernets that are separated by an IP router. PC1’s IP address is 10.1.1.1 and no subnetting is used. Which of the following addresses could be used for PC2?
a. 10.1.1.2
b. 10.2.2.2
c. 10.200.200.1
d. 9.1.1.1
e. 255.1.1.1
f. 1.1.1.1
I chose all except E, the answer the book gave was D and F. Why?
This came out of the new Cisco CCNA Intro Guide.
Tks
djm | |
| dmaftei 2004-01-22, 6:33 pm |
| quote:
Originally posted by djmaplethorpe
I chose all except E, the answer the book gave was D and F. Why?
Because 10.1.1.1 (which goes to the router's eth0) and a, b and c (all of which would go to the router's eth1) are in the same subnet. The router won't let you give eth0 and eth1 addresses that are in the same subnet. | |
| Boulware5 2004-01-22, 10:38 pm |
| quote:
Originally posted by dmaftei
Because 10.1.1.1 (which goes to the router's eth0) and a, b and c (all of which would go to the router's eth1) are in the same subnet. The router won't let you give eth0 and eth1 addresses that are in the same subnet.
How can you tell these addresses go to the router's eth ports? | |
| dmaftei 2004-01-22, 10:50 pm |
| quote:
Originally posted by Boulware5
How can you tell these addresses go to the router's eth ports?
I didn't say those addresses go to the router's ports. I said that different interfaces on the router cannot belong to the same subnet. Here's a picture for the question:
PC1 -- (eth0)router(eth1) -- PC2
PC1 has 10.1.1.1, and the question states "no subnetting is used". So PC1's address is in 10.0.0.0/0. So eth0's address must be in 10.0.0.0/8. So eth1's address cannot be in 10.0.0.0/8 (the IOS won't let you put eth1 in 10.0.0.0/8). So PC2's address cannot be in 10.0.0.0/8. So a, b and c cannot be assigned to PC2. | |
| Boulware5 2004-01-22, 10:53 pm |
| quote:
Originally posted by dmaftei
I didn't say those addresses go to the router's ports. I said that the PC's address and the router interface's address belong to the same subnet. Here's a picture for the question:
PC1 -- (eth0)router(eth1) -- PC2
PC1 has 10.1.1.1, and the question states "no subnetting is used". So PC1's address is in 10.0.0.0/0. So eth0's address must be in 10.0.0.0/8. So eth1's address cannot be in 10.0.0.0/8 (the IOS won't let you put eth1 in 10.0.0.0/8). So PC2's address cannot be in 10.0.0.0/8. So a, b and c cannot be assigned to PC2.
Ahh ok. I guess I interpreted what you said wrong. | |
| djmaplethorpe 2004-01-28, 12:05 pm |
| Sorry, for the slow reply, thanks both for making it clearer. I didn't have a chance to take the test while I was actually working with routers years ago and it's been almost three years since I've been able to touch one. Will have to find one on the internet I guess.
thanks agian
djm |
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