Question 1 Figure 1. Question 1 Network. Consider the network available in Figure 1 (above). It is a prebuilt, converged network using EIGRP, which is not covered in this course. You need to complete...

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Answered 7 days AfterJun 19, 2021

Answer To: Question 1 Figure 1. Question 1 Network. Consider the network available in Figure 1 (above). It is a...

Guljar answered on Jun 26 2021
139 Votes
Task:
Your challenge is to create an ACL that will allow the Right PC to ping the Left only if the IP add
ress of the PC is an ‘even’ number. However, if the Right PC IP address is an odd number, it cannot (or should not be able to) ping the Left PC!
1. Give a short explanation of how you solved this problem (max 200 words)?
Answer:
I’ve put an access list on Router left e3/0 interface, filtering inbound traffic:
Access-list 101 permit ICMP 10.1.1.0 0.0.0.254 host 12.1.1.1 (Left PC)
Interface Ethernet3/0
IP access-group 101 out
So what’s happening here? Well, let’s write the IP address out in binary (in green), and then write the wildcard mask out in binary underneath it (in blue):
00001010.00000001.00000001. 00000000
00000000.00000000.00000000.11111110
When we compare an IP address against a Cisco wildcard, we’re saying that if a bit in the wildcard mask is a 0, then the equivalent bit in the IP address has to stay the same. But if the bit in the wildcard mask is a 1, then we don’t care about the equivalent bit in the IP address.
In...
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