Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
5 Cards in this Set
- Front
- Back
What is an ACL?
|
An ACL is a router configuration script that controls whether a router permits or denies packets to pass based on criteria found in the packet header. ACLs are among the most commonly used objects in Cisco IOS software.
|
|
How many ACLs are allowed on a router?
|
Remember the three Ps. You can configure one ACL per protocol, per direction, per interface:
One ACL per protocol-To control traffic flow on an interface, an ACL must be defined for each protocol enabled on the interface. One ACL per direction-ACLs control traffic in one direction at a time on an interface. Two separate ACLs must be created to control inbound and outbound traffic. One ACL per interface-ACLs control traffic for an interface, for example, Fast Ethernet 0/0. |
|
Dynamic ACL's (Lock and Key)
|
Users that want to traverse the router are blocked until they use Telnet to connect to the router and are authenticated
Lock-and-key is available for IP traffic only. Dynamic ACLs are dependent on Telnet connectivity, authentication (local or remote), and extended ACLs. |
|
Reflexive ACS's
|
Allows outbound traffic and limits inbound traffic in response to sessions that originate inside the router
|
|
Time-based ACLs
|
Allows for access control based on the time of day and week
|