Overview of Reflexive ACLs. Configuring Reflexive ACLs. Reflexive ACL Examples. Chapter 9. Context-Based Access Control. CBAC Functions. Operation of CBAC. CBAC Performance. CBAC Limitations. CBAC Configuration. CBAC Examples. Chapter Filtering Web and Application Traffic. Java Applets.
URL Filtering. Network-Based Application Recognition. Part V: Address Translation and Firewalls. Address Translation. Address Translation Overview. How Address Translation Works.
Address Translation Configuration. Address Translation Issues. Embedded Addressing Information. Controlling Address Translation. Address Translation and Redundancy. Traffic Distribution with Server Load Balancing. Lock-and-Key Access Lists. Lock-and-Key Overview. Lock-and-Key Configuration. Lock-and-Key Example. Authentication Proxy. Introduction to AP. AP Configuration. Verifying and Troubleshooting AP. AP Examples. Routing Protocol Protection. Static and Black Hole Routing.
Interior Gateway Protocol Security. BGP Security. Reverse-Path Forwarding Unicast Traffic. Intrusion-Detection System.
IDS Introduction. IDS Signatures. IDS Configuration. IDS Example. It doesn't matter what the bits in the last octet say. As soon as the router only cares about the first three octets.
If they're on the blocked list, then you're not getting through. A wildcard mask tells the router which bits it should examine and which bits not to examine. It's an easy enough concept. If you needed to create an access list that's going to deny everything from the Notice the wildcard mask. The wildcard mask is 0. With the wildcard mask, the IP address doesn't have to match, it could be anything.
Wildcard masks are beneficial when you have a large network and need to allow free traffic flow between multiple routers. If you have a large network with several routers and LAN segments, you will likely run into wildcard masks.
Just make sure you properly set your wildcard mask to ensure only allowable traffic can pass through your router. Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites.
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This web site contains links to other sites. Because the switch does not know where to send the frame that is addressed to PC3, it will forward the frame to all the switch ports, except for port 4, which is the incoming port.
Which two wildcard masks are required in an extended access list entry that blocks the traffic from network They are created in interface configuration mode.
They require manual reconfiguration to accommodate network changes. They automatically become the default gateway of the router. They are identified in the routing table with the prefix S. They are automatically updated whenever an interface is reconfigured or shutdown. UDP can be used when an application can tolerate some data loss.
UDP is the preferred protocol for applications that provide voice or video that cannot tolerate delay. An extended access list has been created to prevent human resource users from gaining access to the accounting server. All other network traffic is to be permitted. When following the ACL configuration guidelines, on which router, interface, and direction should the access list be applied? The ACL configuration guidelines recommend placing extended access control lists as close to the source of network traffic as possible and placing standard access control lists as close to the destination of network traffic as possible.
R1 was configured with the static route command ip route How should this static route be changed to allow user traffic from the LAN to reach the Internet? Change the destination network and mask to 0. Add an administrative distance of The static route on R1 has been incorrectly configured with the wrong destination network and mask.
The correct destination network and mask is 0. What two pieces of information can be gathered from the generated message? This message is a level five notification message. This message appeared because a major error occurred that requires immediate action. This message indicates that service timestamps have been globally enabled. This message indicates that enhanced security was configured on the vty ports.
The network administrator is configuring the port security feature on switch SWC. What can be concluded from the output that is shown? Choose three. The port is configured as a trunk link. There is no device currently connected to this port. Three security violations have been detected on this interface. The switch port mode for this interface is access mode. Security violations will cause this port to shut down immediately.
Because the security violation count is at 0, no violation has occurred. The port is up because of the port status of secure-up. The violation mode is what happens when an unauthorized device is attached to the port. A port must be in access mode in order to activate and use port security. Which three statements describe limitations in using privilege levels for assigning command authorization?
There is no access control to specific interfaces on a router. The root user must be assigned to each privilege level that is defined. Commands set on a higher privilege level are not available for lower privilege users. Views are required to define the CLI commands that each user can access. Creating a user account that needs access to most but not all commands can be a tedious process.
It is required that all 16 privilege levels be defined, whether they are used or not. An administrator can create customized privilege levels and assign different commands to each level.
However, this method of controlling he level of access to the router has limitations. Using privilege levels access to specific interfaces or ports cannot be controlled and availability of commands cannot be customized across levels.
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