Cisco Updated 350-701 Exam Questions and Answers by kenzo

ExplanationEach of the ASAs interfaces need to be grouped into one or more bridge groups. Each of these groups acts as an independent transparent firewall. It is not possible for one bridge group to communicate with another bridge group without assistance from an external router.As of 8.4(1) upto 8 bridge groups are supported with 2-4 interface in each group. Prior to this only one bridge group was supported and only 2 interfaces.Up to 4 interfaces are permitted per bridge–group (inside, outside, DMZ1, DMZ2)

MAB is a fallback mechanism for IEEE 802.1X that allows network access based on the MAC address of the endpoint. However, MAB does not prevent MAC address spoofing, which is a technique used by attackers to impersonate authorized devices and bypass authentication. To mitigate this risk, two catalyst switch security features can be used in conjunction with MAB: 802.1AE MacSec and port security.

802.1AE MacSec is a standard that provides encryption and integrity protection for data frames between two MACsec-capable devices. MacSec also uses a secure key exchange protocol called MKA (MACsec Key Agreement) to establish and maintain cryptographic keys between the peers. By enabling MacSec on the switch ports, the switch can verify the identity and authenticity of the endpoints and prevent unauthorized access or tampering with the data frames.

Port security is a feature that allows the switch to limit the number and type of MAC addresses that can access a port. Port security can be configured to allow only a specific MAC address or a maximum number of MAC addresses per port. Port security can also be configured to take an action when a violation occurs, such as shutting down the port, sending a trap, or dropping packets. By enabling port security on the switch ports, the switch can prevent multiple devices from accessing the same port or deny access to devices with spoofed MAC addresses.

References:

• Implementing and Operating Cisco Security Core Technologies (SCOR) v1.0, Module 2: Network Security, Lesson 2.2: Implementing Network Access Control
• MAC Authentication Bypass Deployment Guide, MAB Benefits and Limitations, MAB Feature Interaction