cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
1052
Views
15
Helpful
3
Replies

Summarization doubt

RennyGalindez
Level 1
Level 1

I have trying to make this exercice about Summarization,

 

Duda.png

 

 

 

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

luis_cordova
VIP Alumni
VIP Alumni

Hi @RennyGalindez ,

 

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

View solution in original post

3 Replies 3

luis_cordova
VIP Alumni
VIP Alumni

Hi @RennyGalindez ,

 

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

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,

Regards,
Harold Ritter, CCIE #4168 (EI, SP)

Harold Ritter
Spotlight
Spotlight

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

 

Regards,

Regards,
Harold Ritter, CCIE #4168 (EI, SP)
Review Cisco Networking for a $25 gift card