Networking Security Policies Quiz
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Questions and Answers

A router interface can have both outbound and inbound ACLs for IPv4 and IPv6.

True

Only one type of ACL can be configured per router interface.

False

Basic planning is unnecessary before configuring an ACL.

False

Standard ACLs filter packets based solely on the destination IPv4 address.

<p>False</p> Signup and view all the answers

Using a text editor to manage ACLs can aid in creating a reusable library of ACLs.

<p>True</p> Signup and view all the answers

Documenting ACLs using the remark command can assist others in understanding their purpose.

<p>True</p> Signup and view all the answers

Testing ACLs on a production network is recommended before implementation.

<p>False</p> Signup and view all the answers

ACLs do not require accuracy since they can be modified easily after implementation.

<p>False</p> Signup and view all the answers

Extended ACLs should be placed as close to the destination as possible.

<p>False</p> Signup and view all the answers

An extended ACL on R3 can be used since Company A controls that device.

<p>False</p> Signup and view all the answers

The extended ACL on R1 applies to packets leaving the 192.168.11.0/24 network.

<p>True</p> Signup and view all the answers

Permitting all other traffic is part of the ACL configuration for Company A.

<p>True</p> Signup and view all the answers

Applying the extended ACL to the G0/0/1 interface processes all packets entering R1.

<p>False</p> Signup and view all the answers

Denying Telnet and FTP traffic requires specifying both source and destination addresses in the ACL.

<p>True</p> Signup and view all the answers

If the extended ACL is placed incorrectly, it could lead to unwanted traffic crossing the network.

<p>True</p> Signup and view all the answers

Company A's network is identified as 192.168.30.0/24.

<p>False</p> Signup and view all the answers

The outbound application of the extended ACL will process packets from 192.168.10.0/24.

<p>True</p> Signup and view all the answers

The only successful approach for the extended ACL is to apply it after the packets have reached the destination.

<p>False</p> Signup and view all the answers

The placement of the ACL is influenced by organizational control, bandwidth, and configuration ease.

<p>True</p> Signup and view all the answers

Access control elements (ACE) are a type of access control list (ACL).

<p>False</p> Signup and view all the answers

Wildcard masks are used in ACLs to specify ranges of IP addresses.

<p>True</p> Signup and view all the answers

Extended ACLs can filter packets based on more than just the destination IP address.

<p>True</p> Signup and view all the answers

Standard ACLs are always numbered and cannot be named.

<p>False</p> Signup and view all the answers

An ACL is a series of IOS commands used to filter packets based on the packet body's content.

<p>False</p> Signup and view all the answers

By default, Cisco routers have ACLs configured on all interfaces.

<p>False</p> Signup and view all the answers

An inbound ACL filters packets after they have been routed to the outbound interface.

<p>False</p> Signup and view all the answers

Cisco routers only support standard ACLs.

<p>False</p> Signup and view all the answers

An outbound ACL processes packets based on the inbound interface.

<p>False</p> Signup and view all the answers

A wildcard mask is used to ignore certain bits during the matching process of an IPv4 ACE.

<p>True</p> Signup and view all the answers

A wildcard mask of 0.0.15.255 allows access to hosts in the 192.168.16.0/24 to 192.168.31.0/24 networks.

<p>True</p> Signup and view all the answers

The ANDing process in a wildcard mask works the same way as in a subnet mask.

<p>False</p> Signup and view all the answers

A wildcard mask bit 0 matches the corresponding bit in the IPv4 address.

<p>True</p> Signup and view all the answers

The wildcard mask calculated by subtracting the subnet mask from 255.255.255.0 is valid for any IPv4 address.

<p>False</p> Signup and view all the answers

An ACE for the 192.168.3.0/24 network with a wildcard mask of 0.0.0.255 permits 255 hosts.

<p>True</p> Signup and view all the answers

An ACL consists of a sequential list of permission or prohibition commands, known as ACEs.

<p>True</p> Signup and view all the answers

The wildcard mask for the subnet 192.168.3.32/28 is 0.0.0.255.

<p>False</p> Signup and view all the answers

All packets are evaluated by the router before being forwarded if an ACL is applied.

<p>True</p> Signup and view all the answers

Wildcard masks are used in ACLs to match only specific IP addresses.

<p>False</p> Signup and view all the answers

The access-list command with 0.0.15.255 will deny all requests from hosts in the 192.168.31.0/24 network.

<p>False</p> Signup and view all the answers

The calculation for a wildcard mask is straightforward and doesn't require any specific method.

<p>False</p> Signup and view all the answers

Access-list 10 permit 192.168.3.0 0.0.0.255 allows traffic from a single host.

<p>False</p> Signup and view all the answers

The subnet mask for a /24 network is 255.255.255.0.

<p>True</p> Signup and view all the answers

Wildcards can have more than one valid value for a single mask.

<p>False</p> Signup and view all the answers

Study Notes

Router Interface ACLs

  • A router interface can have one outbound and one inbound IPv4 ACL, and one outbound and one inbound IPv6 ACL.
  • ACLs can be selectively configured based on the organization's security policy.

ACL Best Practices

  • Detailed planning is pivotal for effective ACL implementation.
  • ACLs should align with organizational security policies to prevent access issues.
  • Writing objectives for ACLs helps clarify their intended function.
  • Using a text editor for creating and saving ACLs fosters the development of a reusable library.
  • Documenting ACLs with remark commands enhances clarity and understanding.
  • Testing ACLs in a development environment is crucial before deploying on a production network to mitigate errors.

Types of IPv4 ACLs

  • Two main types of IPv4 ACLs exist: Standard ACLs and Extended ACLs.
  • Standard ACLs: Filter packets based solely on the source IPv4 address.

Wildcard Masks in ACLs

  • Wildcard masks are used to define address ranges for ACLs.
  • Example: To permit all hosts in the range from 192.168.16.0 to 192.168.31.0, use the wildcard mask 0.0.15.255.
  • Wildcard mask calculation: Subtract the subnet mask from 255.255.255.255.

Extended ACL Placement

  • Place extended ACLs close to the source for effective traffic control.
  • An extended ACL should specify both source and destination addresses to properly filter traffic.
  • For efficient application, extended ACLs should be placed in the most strategic interface based on organizational control.

Important Concepts

  • ACLs filter packets using a series of permit/deny statements known as Access Control Elements (ACEs).
  • Inbound ACLs filter packets before routing, while outbound ACLs filter after routing.
  • IPv4 ACEs use a 32-bit wildcard mask to determine which address bits to evaluate for matches.

Additional Key Terms

  • Access Control List (ACL)
  • Access Control Element (ACE)
  • Packet Filtering
  • Wildcard Mask
  • Host Keyword
  • Any Keyword
  • Numbered ACLs
  • Named ACLs

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Related Documents

ENSA_Module_4_ACL_Concept.pdf

Description

Test your understanding of router interface ACL configurations in networking security. This quiz covers the application of inbound and outbound IPv4 and IPv6 ACLs and their relevance to organizational security policies. See how well you know the rules governing access control lists in routers.

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