Cisco 400-251: CCIE Security Written Exam | ASA Transparent Mode

ASA Transparent Mode

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Question

Which two statements about ASA transparent mode are true? (Choose two.)

Answers

Explanations

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A. B. C. D. E. F.

CD.

Sure, I'd be happy to explain the answer to this question!

ASA (Adaptive Security Appliance) is a security device developed by Cisco, which can operate in different modes, including routed mode, transparent mode, and multiple context mode. In transparent mode, the ASA acts like a "bump in the wire," where it does not modify the IP addresses of the traffic passing through it and does not participate in routing.

Now, let's look at each statement and determine if it's true or false.

A. It requires the inside and outside interface to be in different subnets. True. In transparent mode, the ASA does not perform routing, and hence, the inside and outside interfaces must be in different IP subnets. This allows the ASA to forward traffic between the interfaces based on the MAC addresses of the hosts, rather than their IP addresses.

B. It cannot pass multicast traffic. False. The ASA in transparent mode can pass multicast traffic, just like any other traffic. However, the ASA cannot route multicast traffic, so it can only pass multicast traffic that is destined to hosts on the same subnet.

C. It can pass IPv6 traffic. True. The ASA in transparent mode supports both IPv4 and IPv6 traffic.

D. It supports ARP inspection. True. The ASA in transparent mode supports ARP inspection, which can help prevent ARP spoofing attacks.

E. It drops ARP traffic unless it is permitted. False. By default, the ASA in transparent mode allows all ARP traffic to pass through it. However, you can configure ARP access-lists to permit or deny specific ARP traffic.

F. It does not support NAT. True. In transparent mode, the ASA does not perform network address translation (NAT). NAT is a function performed by a device that modifies the source or destination IP addresses of traffic passing through it.

So, the two correct statements are:

A. It requires the inside and outside interface to be in different subnets. D. It supports ARP inspection.