A network technician is reviewing operational characteristics for standard IPv4 Access Control Lists (ACLs) on a Cisco router. Which of the following statements regarding standard IPv4 ACLs are correct? (Select TWO.)
- Standard ACLs filter network traffic based strictly on the source IPv4 address.Cevap
- Standard ACLs should generally be placed as close to the destination network as possible.Cevap
- CStandard ACLs inspect Layer 4 transport protocol header details such as TCP and UDP port numbers.
- DUnmatched traffic is allowed through by default because standard ACLs terminate with an implicit permit rule.
Cevap
Standard IPv4 ACLs filter traffic based only on the source IPv4 address and should be applied as close to the destination as possible to prevent unintentionally blocking traffic intended for other locations.
Standard IPv4 ACLs evaluate packets strictly by their source address. Because they lack the ability to inspect destination addresses or service ports, Cisco best practice is to place standard ACLs as close to the destination network as possible to avoid dropping legitimate traffic destined for other networks.
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Standard IPv4 ACL Operational Rules and Recommended Placement