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Which Two Statements Are Correct About Extended ACLs? Choose Two
Access Control Lists (ACLs) play a crucial role in network security by filtering traffic based on defined rules. Extended ACLs offer more flexibility than standard ACLs as they allow for granular control over network traffic. However, understanding the correct statements about extended ACLs is essential to ensure effective network security implementation. In this article, we will discuss two statements that are correct about extended ACLs and provide answers to some frequently asked questions (FAQs) related to their use.
Statement 1: Extended ACLs can filter traffic based on source and destination IP addresses.
This statement is correct. Extended ACLs provide the ability to filter traffic based on both source and destination IP addresses. By specifying specific IP addresses or ranges, network administrators can allow or deny traffic from specific hosts or networks. This level of granularity allows for precise control over network traffic flow, improving security and network performance.
For example, an extended ACL rule can be created to allow traffic from a specific source IP address (e.g., 192.168.1.10) to a specific destination IP address (e.g., 10.0.0.1). This rule would only permit traffic between these two IP addresses while blocking all other traffic.
Statement 2: Extended ACLs can filter traffic based on protocols and port numbers.
This statement is also correct. In addition to filtering based on IP addresses, extended ACLs can filter traffic based on protocols and port numbers. This level of control allows administrators to restrict or allow traffic to specific services or applications running on different ports.
For instance, an extended ACL rule can be configured to allow incoming traffic on TCP port 80 (HTTP) to a web server while blocking traffic on other ports. Similarly, it can allow traffic on UDP port 53 (DNS) to a DNS server while denying traffic on other ports.
FAQs:
Q1. What is the difference between standard and extended ACLs?
A1. Standard ACLs primarily filter traffic based on source IP addresses only, while extended ACLs offer more granular control by filtering traffic based on source and destination IP addresses, protocols, and port numbers.
Q2. Can extended ACLs be applied to both inbound and outbound traffic?
A2. Yes, extended ACLs can be applied to both inbound and outbound traffic. Inbound ACLs control traffic coming into an interface, while outbound ACLs control traffic leaving the interface.
Q3. How are extended ACLs processed?
A3. Extended ACLs are processed sequentially from the top down. Each rule is evaluated in the order it appears in the ACL until a match is found. Once a match is found, the action specified in that rule is applied, and processing stops.
Q4. Can extended ACLs be used to filter traffic based on MAC addresses?
A4. No, extended ACLs are primarily used for filtering traffic based on IP addresses, protocols, and port numbers. MAC addresses are typically handled by other security mechanisms, such as MAC filtering on switches.
In conclusion, the correct statements about extended ACLs are that they can filter traffic based on source and destination IP addresses, as well as protocols and port numbers. By leveraging these capabilities, network administrators can enhance network security and ensure proper traffic management. Understanding the differences between standard and extended ACLs, as well as their processing order, is crucial for effective implementation.
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