Standard ACL Statements Breakdown
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Questions and Answers

What does the wildcard mask '0.0.0.0' indicate in an ACL statement?

  • It matches any IP address.
  • It allows all IP addresses except one.
  • It specifies a range of IP addresses.
  • It indicates a specific host address. (correct)

    • What range of autonomous numbers is used for standard ACLs?

  • 200 to 255
  • 1 to 99 (correct)
  • 1 to 100
  • 100 to 199

    • Which of the following is a reason to use the 'log' option in an ACL statement?

  • To generate an alert for the firewall.
  • To permanently block traffic.
  • To bypass the ACL for specific addresses.
  • To create a log entry for traffic matching the rule. (correct)

    • In an extended ACL statement, which protocol is NOT typically listed as an option?

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

    What is the purpose of specifying a destination address in an extended ACL?

    <p>To control access to specific devices in the network.</p> Signup and view all the answers

    Which ACL statement denies access to a specific host while also logging attempts?

    <p>access-list 78 deny host 192.168.90.36 log</p> Signup and view all the answers

    What do extended ACLs allow you to match as part of their configuration?

    <p>Protocols and both source and destination addresses</p> Signup and view all the answers

    What does the term 'permit or deny' indicate in an ACL statement?

    <p>It determines whether traffic is allowed or blocked.</p> Signup and view all the answers

    What is the primary function of an access control list (ACL) in this context?

    <p>To permit and deny specific traffic based on defined rules.</p> Signup and view all the answers

    In the extended access list example provided, which network is being blocked from receiving information?

    <p>172.20.70.0</p> Signup and view all the answers

    Which command is used to start configuring the access control list on the router?

    <p>Router(config)# access-list</p> Signup and view all the answers

    What is the purpose of the command 'ip access-group _________ in or out'?

    <p>To apply the ACL to an interface for controlling incoming/outgoing traffic.</p> Signup and view all the answers

    What subnet mask is used for the 172.20.70.0 network in this context?

    <p>255.255.255.0</p> Signup and view all the answers

    Which of the following addresses must be blocked from reaching Cindy’s computer?

    <p>192.168.122.0 to 192.168.122.63</p> Signup and view all the answers

    Which command allows users to exit the configuration mode back to the router prompt?

    <p>Router(config)# exit</p> Signup and view all the answers

    What is the first step in configuring an ACL on a router?

    <p>Accessing the configuration terminal mode.</p> Signup and view all the answers

    What must be done after creating the access list before it is functional?

    <p>Assign it to an interface.</p> Signup and view all the answers

    What is the purpose of the access control list (ACL) mentioned?

    <p>To specify which IP addresses can communicate with each other.</p> Signup and view all the answers

    Which command is used to enter the configuration mode on the router?

    <p>Router# configure terminal</p> Signup and view all the answers

    When creating an ACL, at which point do you specify the direction of traffic?

    <p>When applying the access-list to an interface.</p> Signup and view all the answers

    What must the router's interface command include after defining the ACL?

    <p>ip access-group</p> Signup and view all the answers

    What does the term 'deny/permit specific addresses' imply in the context of an ACL?

    <p>It allows traffic from specific addresses while blocking others.</p> Signup and view all the answers

    What should be included when writing an extended access list to allow specific communications?

    <p>Both permit and deny rules for traffic.</p> Signup and view all the answers

    What is the function of input and output in the command 'ip access-group _________ in or out'?

    <p>Input refers to traffic received, output refers to traffic sent from the router.</p> Signup and view all the answers

    In the context provided, which IP address should be explicitly denied access in the ACL?

    <p>172.59.2.18</p> Signup and view all the answers

    What is a characteristic of extended access lists compared to standard access lists?

    <p>They can filter traffic based on additional criteria such as protocols and ports.</p> Signup and view all the answers

    What is likely the first step when implementing an ACL on a router?

    <p>Identify the IP addresses that need to be controlled.</p> Signup and view all the answers

    What is the main function of the access list named 'Media_Center'?

    <p>Permit traffic from 172.31.195.1 through 172.31.195.7 to the 192.168.125.0 network</p> Signup and view all the answers

    How should the access-list be applied to an interface according to the installation process?

    <p>By configuring the command 'ip access-group <number> in or out'</p> Signup and view all the answers

    What is the purpose of the command 'deny all other traffic' in an access list?

    <p>To ensure only specified traffic is allowed</p> Signup and view all the answers

    Which command would you use to create a named extended access list?

    <p>Router(config)# ip access-list extended Media_Center</p> Signup and view all the answers

    What information is necessary to complete the access-list configuration on a router?

    <p>Router name, interface, and access-list number</p> Signup and view all the answers

    What command begins the configuration of an access control list (ACL) on a router?

    <p>Router(config)# ip access-list extended</p> Signup and view all the answers

    Which step follows placing the access list on the interface?

    <p>Router(config-if)# exit</p> Signup and view all the answers

    In the command 'Router(config-if)# ip access-group _________ in or out', what should be provided in the blank?

    <p>ACL number or name</p> Signup and view all the answers

    What is the purpose of the extended access list sample #5 mentioned?

    <p>To deny the first 15 usable addresses of the 192.168.15.0 network from reaching the 172.21.0.0 network</p> Signup and view all the answers

    When applying an ACL, what must be indicated as part of the command structure?

    <p>Whether the access-list is applied in or out</p> Signup and view all the answers

    What is required before copying the running configuration to the startup configuration?

    <p>Exit global configuration mode</p> Signup and view all the answers

    What command is used to save the running configuration on a router?

    <p>Router# copy run start</p> Signup and view all the answers

    Which IP addresses are being denied access in the extended access list sample to the 172.21.0.0 network?

    <p>192.168.15.0 to 192.168.15.14</p> Signup and view all the answers

    What is the first step in configuring an ACL on a router?

    <p>Enter global configuration mode</p> Signup and view all the answers

    What must be done to remove an access list from an interface?

    <p>Use the 'no ip access-group' command</p> Signup and view all the answers

    Study Notes

    Standard ACL Statements

    • Standard ACLs use numbers ranging from 1 to 99.
    • Commands include permit or deny, and they apply to source addresses only.
    • Example: access-list 1 permit 192.168.90.36 0.0.0.0 allows the specified IP.
    • Wildcard mask 0.0.0.0 indicates a match for the exact source address.
    • access-list 78 deny host 192.168.90.36 log blocks a specific host and logs each matching packet.

    Extended ACL Statements

    • Extended ACLs range from 100 to 199.
    • Includes protocols like TCP, UDP, ICMP, and IP, allowing for fine-grained traffic control.
    • Source and destination addresses can be specified with wildcard masks.
    • Example: access-list 125 permit ip 192.168.90.36 0.0.0.0 192.175.63.12 0.0.0.0 permits IP traffic from one specific IP to another.
    • Log entries are optional, indicating the traffic affected by the ACL statements.

    ACL Configuration Steps

    • Enter configuration mode with Router# configure terminal.
    • Define the ACL with the appropriate commands.
    • Assign the ACL to an interface with ip access-group followed by specifying inbound or outbound direction.
    • Save the configuration with Router# copy run start.

    Example ACL Problems

    • Block devices from one network accessing specific other hosts using extended ACLs.
    • For instance, deny network 172.20.70.0 from receiving data from a specified IP and control traffic from another specified range.
    • Named ACLs, such as “Media_Center,” can be created to manage specific address ranges and deny all other traffic.

    Address Ranges in ACLs

    • ACLs can deny or permit ranges of addresses effectively.
    • Blocking a range impacts multiple devices on specified networks.
    • Specific implementations may vary based on network requirements with multiple formats for statements.

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    Related Documents

    Access Lists Workbook PDF

    Description

    Explore the components and syntax of a standard Access Control List (ACL) statement. This quiz will guide you through the elements including permit/deny actions, wildcard masks, and access-list numbering. Perfect for those looking to deepen their understanding of network security.

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