The correct answer is:
Layer 2 Tunnel:
Facilitates Layer 2 connectivity between the WLC's wired interface and the WLAN clients.
Encapsulates LWAPP traffic between the access point and the WLC in Ethernet 0xBBBB.
Layer 3 Tunnel:
Requires IP addresses on the access point and the WLC.
Uses UDP or UDP Lite for IPv6 deployments.
The reason why "It forwards only IP EtherType frames" and "It supports LWAPP tunneling within Ethernet frames and UDP packets." are wrong because the CCNA exam is testing your knowledge of the different wireless architectures. These two points do not describe any specific wireless architecture. They simply describe the general features of a Layer 2 tunnel.
The correct answer for the CCNA question describes the specific features of the two wireless architectures: Layer 2 Tunnel and Layer 3 Tunnel. This is the information that the CCNA exam is testing you on.
Processing the statements through ChatGPT gives the following result:
1: Layer 2
2: Layer 2
3: Discarded, as both tunnels can forward other protocols than IP Ethertype frames
4: Layer 3
5: Layer 3
6: Discarded, as IPv6 is irrelevant here and UDP Lite typically not used in standard tunneling protocols
Option 3,4,5 apply to both L2 tunnel and L3 tunnel.
Apparently, the person who created this question doesn't even understand the text he/she copied from Cisco documentation.
Lightweight Access Point Protocol (LWAPP) is a protocol that can control multiple Wi-Fi wireless access points at once. This can reduce the amount of time spent on configuring, monitoring and troubleshooting a large network. The system will also allow network administrators to closely analyze the network.
On Layer 2, LWAPP only requires a data link connection in order to transfer frames and Layer 2 broadcasts. Even if IP connectivity is not established it will still operate at layer 2.
LWAPP Layer 3 and 4
edit
Layer 4 UDP 12222 (data channel) and 12223 (control channel) connectivity must be established to work with this form of the protocol. Broadcasts or DHCP option 43 can be used to prime the access-points of the network. The controller must be on the same subnet if DHCP is not configured to handle layer 3 LWAPP provisioning. Another option for directing an AP to the controller is by defining the controller on the DNS server of the network.
I think this kind of question is not in CCNA 200-301 exam topic
upvoted 6 times
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