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ccna composite exam vs icnd1 icnd2. Self-inverting IPv4 ACL configuration and debugging methods.The experimental topology for configuring self-reversing IPV4ACL is shown in Figure 9-3. This experiment requires that the intranet hosts can actively access the external network, but the external hosts cannot actively access the internal network, so as to effectively protect the internal network and achieve network connectivity through RIPv2.Configure a self-inverting IPv4 ACL on Router R2 R2(config)#ip reflexive-list timeout 100 Configure a temporary access entry to live for 300 seconds by default, in the range of 1.2 147 483 seconds R2(config)#ip access-list extended ACLOUT R2(config-ext-nacl)#perinit tcp any any reflect REF Create a self-reversing IPv4 ACL table entry with the name of REF R2(config-ext-nacl)#permit udp any any reflect REFR2(config-ext-nacl)#permit icmp any any reflect REF R2(config)#ip access^list extended ACLIN R2(config-ext-nacl)#peniiitudpanyanyeq520 Release RIP routing protocol traffic R2(config-ext-nacl)#evaluateREFEvaluate the reflection listR2(config)#interface Serial0/0/l R2(config-if)#ip access-group ACLOUT out R2(config-if)#ip access-group ACLIN in.128.Cisco Networking Lab CCNA Lab Guide (Release 2)Multiple [Technical Points].Although conceptually similar to the established parameters of an extended IPv4ACL, a self-reversing IPv4ACL can also be used for UDP and ICMP protocols that do not contain ACK or RST bits. Self-inverting IPv4ACLs can only be defined in named extended IPv4ACLs and cannot be defined using numbered IPv4ACLs. Using a self-reversing IPV4ACL allows outgoing traffic to return, but prevents actively generated traffic from the external network (unless special traffic, such as the RIP traffic in this experiment, is allowed with a permit statement) from accessing the internal network, thus allowing better protection of the internal network. Self-reversing IPv4ACLs are automatically generated temporarily when traffic is generated (e.g., outbound traffic) and temporary entries are deleted when the session ends.Self-inverting IPv4ACLs are not applied directly under an interface, but are nested under a named extended IIMACL. 4. experimental debugging