Relevant Cisco CCNA ACL Questions

Relevant Cisco CCNA ACL Questions

Access Control Lists, or ACLs, are an essential part of network security and play a significant role in Cisco CCNA certification exams. Understanding how to configure and troubleshoot ACLs is crucial for aspiring network professionals. In this blog post, we will discuss various ACL-related questions that are commonly asked in CCNA exams. Test your knowledge and deepen your understanding of ACLs with this comprehensive list of questions.

Question 1: What is an ACL?

An Access Control List (ACL) is a set of rules that are used to filter network traffic based on specified criteria. It allows or denies traffic based on source and destination IP addresses, protocols, ports, or other factors. ACLs are commonly used to improve network security by restricting access to resources.

Question 2: What are the different types of ACLs?

There are two main types of ACLs: Standard ACLs and Extended ACLs. Standard ACLs operate at the network layer (Layer 3) and filter traffic based on source IP addresses. On the other hand, Extended ACLs operate at the transport layer (Layer 4) and can filter traffic using various criteria such as source/destination IP addresses, protocols, and ports.

Question 3: How do you configure a Standard ACL?

To configure a Standard ACL on a Cisco router, you can use the “access-list” command followed by a number (1-99). For example, to create a Standard ACL that denies traffic from a specific source IP address, you can use the following command:

access-list 10 deny host

Question 4: What is the difference between an inbound and outbound ACL?

Inbound and outbound ACLs determine the direction in which the ACL is applied to an interface. An inbound ACL is applied to incoming traffic on an interface, while an outbound ACL is applied to outgoing traffic. It’s important to consider the direction of the ACL when configuring rules to ensure the desired traffic is filtered.

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