You were tasked to configure a Cisco ASA to permit SMTP traffic from hosts in 192.168.88.0/25 to an email server (10.2.2.2). Which of the following access control entries (ACEs) in... You were tasked to configure a Cisco ASA to permit SMTP traffic from hosts in 192.168.88.0/25 to an email server (10.2.2.2). Which of the following access control entries (ACEs) in an ACL will accomplish this task?
Understand the Problem
The question is asking for the correct access control entry (ACE) to allow SMTP traffic (port 25) from a specific network to an email server. The focus is on identifying which of the provided options accurately specifies the correct ACL configuration.
Answer
access-list ACL_NAME permit tcp 192.168.88.0 255.255.255.128 host 10.2.2.2 eq smtp
The appropriate ACE is: access-list ACL_NAME permit tcp 192.168.88.0 255.255.255.128 host 10.2.2.2 eq smtp
Answer for screen readers
The appropriate ACE is: access-list ACL_NAME permit tcp 192.168.88.0 255.255.255.128 host 10.2.2.2 eq smtp
More Information
In Cisco ASA, Access Control Entries (ACEs) in an Access Control List (ACL) define rules that allow or deny traffic based on various criteria. Here, the source is the network 192.168.88.0/25, and the destination is the exact IP of the email server 10.2.2.2 on the SMTP port.
Tips
A common mistake is forgetting to specify the correct subnet mask or forgetting to specify the 'eq smtp' to specify the SMTP port.
Sources
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