Cisco 400-251: ASA Classifier Behaviors in Shared Interface | CCIE Security Exam

ASA Classifier Behaviors in Shared Interface

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Question

Depending on configuration, which of the following two behaviors can the ASA classifier exhibit when receiving unicast traffic on an interface shared by multiple contexts? (Choose two.)

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Explanations

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A. B. C. D. E.

BE.

The ASA classifier is responsible for determining the context to which incoming traffic belongs when it arrives on an interface that is shared by multiple contexts. The behavior of the classifier can vary depending on the configuration.

Option A - Traffic is classified using the destination address of the packet using the connection table: In this case, the ASA classifier will examine the destination IP address of the incoming packet and match it against the connection table. The connection table contains information about existing connections, including the context to which the connection belongs. If a match is found, the packet is classified and forwarded to the appropriate context.

Option B - Traffic is classified using the destination address of the packet using the NAT table: If this option is configured, the ASA classifier will examine the destination IP address of the incoming packet and match it against the NAT table. The NAT table contains information about how IP addresses and ports are translated between different networks. If a match is found, the packet is classified and forwarded to the appropriate context.

Option C - Traffic is classified using the destination address of the packet using the routing table: In this case, the ASA classifier will examine the destination IP address of the incoming packet and match it against the routing table. The routing table contains information about how to reach different networks. If a match is found, the packet is classified and forwarded to the appropriate context.

Option D - Traffic is classified by copying and sending the packet to all the contexts: If this option is configured, the ASA classifier will copy the incoming packet and send it to all contexts. Each context will then examine the packet and determine whether it belongs to that context. This can lead to increased processing overhead and potentially reduce performance.

Option E - Traffic is classified using the destination MAC address of the packet: In this case, the ASA classifier will examine the destination MAC address of the incoming packet and match it against a MAC access list. The MAC access list contains information about which MAC addresses are allowed to pass through the interface. If a match is found, the packet is classified and forwarded to the appropriate context.

In summary, options A, B, and C are all valid ways to classify traffic based on the destination IP address, while option D involves copying the packet to all contexts and option E involves classifying traffic based on the destination MAC address.