Homework Assignment Week 6, 45 Points Maximum: What Is The

Homework Assignmentweek 645 Points Maximumacls1 What Is The Best Plac

HOMEWORK ASSIGNMENT Week Points Maximum ACLs 1. What is the best place to put a Standard ACL? Why is this the best place to put it? Where is the best place to put an Extended ACL? Why? ( 10 Points ) 2. What range of IP addresses is represented by the network and wildcard mask 192.168.70.0 0.0.0. points ) 3. Create an ACL that would prevent only Host A from accessing only the Finance Server? ( 25 points )

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Homework Assignmentweek 645 Points Maximumacls1 What Is The Best Plac

Homework Assignmentweek 645 Points Maximumacls1 What Is The Best Plac

This assignment explores the strategic placement and creation of Access Control Lists (ACLs) within a network infrastructure. It emphasizes understanding the optimal locations to place Standard and Extended ACLs, interpreting IP address ranges based on network and wildcard masks, and designing tailored ACLs to control specific host access. Proper implementation of ACLs is crucial for maintaining network security while ensuring authorized user access.

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Access Control Lists (ACLs) are fundamental tools in network security, allowing administrators to define which users or devices can access specific network resources. Proper placement and configuration of ACLs are vital to maximize their effectiveness and minimize unintended restrictions or security loopholes.

1. Optimal Placement of Standard and Extended ACLs

Standard ACLs should ideally be placed closest to the destination network or resource. This approach minimizes the risk of restricting traffic unnecessarily and ensures that only authorized sources gain access to the target network. Placing a standard ACL near the destination allows the network administrator to filter traffic based solely on source IP addresses, making it efficient for simple access restrictions.

In contrast, Extended ACLs should be positioned as close to the source as possible, especially when filtering based on both source and destination IP addresses, protocols, or port numbers. By doing so, unwanted traffic is prevented from traversing deeper into the network, reducing unnecessary load on the network devices and enhancing overall security. For example, configuring an Extended ACL near the originating device or network segment prevents undesirable traffic from entering or crossing into other parts of the network.

2. Interpreting IP Address Range Using Network and Wildcard Mask

The IP address 192.168.70.0 with a wildcard mask of 0.0.0.255 specifies a range of IP addresses within the 192.168.70.0/24 subnet. The wildcard mask 0.0.0.255 indicates that the last octet is variable, meaning any IP address from 192.168.70.0 through 192.168.70.255 is included in this network range. This range encompasses 256 IP addresses, from 192.168.70.0 to 192.168.70.255, which includes the network address, broadcast address, and all usable host addresses within that subnet.

3. Creating an ACL to Restrict Host A from Accessing the Finance Server

To prevent only Host A from accessing the Finance Server, a specific ACL must be designed with precise source and destination IP addresses. Assuming Host A has an IP address of 192.168.70.10, and the Finance Server's IP address is 192.168.70.50, the ACL would be configured to deny traffic from Host A to the server. The ACL example in Cisco syntax is as follows:

access-list 100 deny ip host 192.168.70.10 host 192.168.70.50


access-list 100 permit ip any any

This ACL denies all IP traffic from Host A to the Finance Server while allowing all other traffic. It should be applied inbound or outbound on the appropriate interface depending on network architecture. Accurate IP addresses must be confirmed for host and server for the ACL to function correctly.

Conclusion

Understanding where to place ACLs and how to design them according to specific security requirements is critical for protecting network infrastructure. Placing Standard ACLs near its destination optimizes simple filtering, while Positioned Extended ACLs closer to the source provides more granular control. Additionally, correctly interpreting network and wildcard masks helps define accurate IP ranges, and creating precise ACLs enables tailored access restrictions, enhancing overall network security.

References

  • Cisco. (2020). Cisco Access Control Lists (ACLs). Cisco. https://www.cisco.com
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  • Stanford, I., & Browning, T. (2019). Networking Fundamentals: CCNA Exploration Companion Guide. Cisco Press.
  • Mehta, P., & Sethi, J. (2021). Network Security Essentials: Applications and Standards. McGraw-Hill Education.
  • Hucaby, D. (2009). CCNP Routing and Switching ROUTE 300-101 Official Cert Guide. Cisco Press.
  • Benjamin, C. (2016). Network Security Principles and Practice. Routledge.
  • Kozierok, R. (2005). The TCP/IP Guide: A Comprehensive, Illustrated Internet Protocols Reference. No Starch Press.
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  • Vacca, J. R. (2014). Computer and Network Security. Jones & Bartlett Learning.
  • Gerhards, M. (2020). Implementing ACLs in Cisco Networks. Network World. https://www.networkworld.com

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