cancel
Showing results for
Did you mean:
cancel
441
Views
15
3
Replies
Highlighted
Beginner

## Summarization doubt

I have trying to make this exercice about Summarization,

After my calculations I tought the correct answer maybe B, D and E, the simulator says the correct is B and E, why they are the answer and not E and D for example?

Thanks!

1 ACCEPTED SOLUTION

Accepted Solutions
Highlighted

After summarizing the networks, the result was:

192.168.176.0/21 = 192.168.1011 0|000.0

This indicates that the networks connected to R2 must be equal until the cut of the mask (/21)

Options A and C do not meet this condition, so they are not one of the networks connected to R2.

Option B meets the condition:

192.168.183.41 = 192.168.1011 0111.0010 1001

Option E meets the condition:

192.168.179.4 = 192.168.1011 0011.0000 0100

Option D meets the condition, but it is a broadcast address, so it will not be a viable destination ip (only unicast addresses are routed from one router to another):

192.168.183.255 = 192.168.1011 0111.1111 1111

Regards

3 REPLIES 3
Highlighted

After summarizing the networks, the result was:

192.168.176.0/21 = 192.168.1011 0|000.0

This indicates that the networks connected to R2 must be equal until the cut of the mask (/21)

Options A and C do not meet this condition, so they are not one of the networks connected to R2.

Option B meets the condition:

192.168.183.41 = 192.168.1011 0111.0010 1001

Option E meets the condition:

192.168.179.4 = 192.168.1011 0011.0000 0100

Option D meets the condition, but it is a broadcast address, so it will not be a viable destination ip (only unicast addresses are routed from one router to another):

192.168.183.255 = 192.168.1011 0111.1111 1111

Regards

Highlighted
Cisco Employee

Hi Luis,

> Option D meets the condition, but it is a broadcast address, so it will not be a viable destination ip (only unicast addresses are > routed from one router to another):

This subnet is not directly connected, therefore this would not prevent traffic to this destination from being forwarded from R1 to R2.

Regards,

Harold Ritter
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
México
Highlighted
Cisco Employee

You are correct. D is also correct. R1 would forward packets with destination address 192.168.183.255 to R2.

Regards,

Harold Ritter