In Figure 8.12, assume that the outer router uses ACL rules given in Table 8.7 a

Question

In Figure 8.12, assume that the outer router uses ACL rules given in Table 8.7 and the inner router uses ACL rules given in Table 8.8. In addition to port 25, other ports in the tables are defined as follows: port 80 is used for Web server program HTTP, port 7 is used for server program echo, port 23 is used for server program telnet, and port 22 is used for server program SSH.

(a) Explain what each ACL rule is intended to do.

(b) Point out which ACL rule is used for egress packets and which ACL rule is used for ingress packets.

Explanation / Answer

Answer :

A) any ACL is configured in such a way that condition checks starts from top to end of the ACL.

I am not sure if this ACL will work.However , Here explaining each line individually.

B)

Egress ACL : Any ACL which filter any packet going outside is termed as egress acl

Ingress ACL: any ACL which filters the traffic coming inside is known as ingress ACL.

in Table 8.7

Line number 2 & 3 respresnts ACL for egress packets. remaining ingress packet ACL.

in Table 8.8

line number 4,5,9& 10 are ingress and rest is egress.

Thanks

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