Exam 200-301 topic 1 question 1246 discussion

A - 802.3ad ->From what I'm reading its 802.3ad is a link aggregation standard for WLC LAG. This is similar to 802.1q standard for trunk ports on switches. Cisco: Link aggregation (LAG) is a partial implementation of the 802.3ad port aggregation standard. It bundles all of the controller’s distribution system ports into a single 802.3ad port channel. This reduces the number of IP addresses required to configure the ports on your controller. When LAG is enabled, the system dynamically manages port redundancy and load balances access points transparently to the user. https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-5/config-guide/b_cg85/ports_and_interfaces.html

A is correct All WLCs support the aggregation of multiple distribution ports into a single port using the 802.3ad port standard. This allows an administrator to create one large link between the WLC and the local switch. https://www.firewall.cx/cisco/cisco-wireless/cisco-wireless-controllers-interfaces-ports-functionality.html (last page)

The standard required when more than one distribution system port and only one IP address are configured for a Cisco Wireless LAN Controller (WLC) is 802.3ad. This standard is used for Link Aggregation (LAG), which bundles all of the controller’s distribution system ports into a single 802.3ad port channel. This reduces the number of IP addresses required to configure the ports on your controller. So, the correct answer is A. 802.3ad.

A is Correct! 802.3ad is LAG(link aggregation protocol) which is used between the WLC(using the distribution system port) and the switch. 802.1q isn't necessary since LAG can be configured in both access and trunk port modes

GPTs answer(802.1q): In a Cisco Wireless LAN Controller (WLC) deployment where more than one distribution system port is configured and only one IP address is used, the standard required is IEEE 802.1Q. IEEE 802.1Q is a standard for Virtual LANs (VLANs) that provides a method for tagging Ethernet frames with VLAN information. It allows multiple VLANs to share a single physical connection and helps in separating broadcast domains in a network. When using multiple distribution system ports on a Cisco WLC with a single IP address, VLAN tagging (802.1Q) is typically employed to differentiate between different VLANs and maintain logical separation. Each VLAN can be associated with a specific distribution system port on the WLC. Make sure that the switches and other network devices in your infrastructure also support and are configured to handle 802.1Q VLAN tagging to ensure proper communication between the WLC and the rest of the network.

Guys, this is B: 802.1Q The quesiton isn't very clear, but the point is that we can only use one IP address, so if we have several SSIDs, we have to tag the rest of the VLANs. Feel free to correct me.

I think A is the answer. B is incorrect because 802.1q is a standard for VLAN tagging. 802.1d is for Spanning Tree Protocol. 802.1af - I never heard fo this.

It´s A for LAG

To get the most use out of each distribution system port, you can configure all of them to operate as a single logical group, much like an EtherChannel or port-channel on a switch. Controller distribution system ports can be configured as a link aggregation group (LAG) such that they are bundled together to act as one larger link. With a LAG configuration, traffic can be load-balanced across the individual ports that make up the LAG. In addition, LAG offers resiliency; if one individual port fails, traffic will be redirected to the remaining working ports instead.

A. 802.3ad When more than one distribution system port and only one IP address are configured for a Cisco Wireless LAN Controller (WLC), the 802.3ad standard, also known as Link Aggregation or EtherChannel, is typically used. EtherChannel allows multiple physical links to be bundled together into a single logical link, providing increased bandwidth and redundancy. In the context of a Cisco WLC, this can be used to aggregate multiple ports for increased capacity and reliability. The use of EtherChannel ensures that a single IP address can be assigned to the logical link, simplifying the management of the WLC. Therefore, option A (802.3ad) is the correct choice for this scenario.

The correct answer is B. 802.1q. The 802.3ad (Link Aggregation Control Protocol or LACP) standard is used to group multiple physical interfaces into a single logical interface, known as an aggregation port. However, this standard is not used when there is more than one port of a distribution system and only one IP address configured on a Cisco WLC (Cisco Wireless LAN Controller). Instead, the standard needed in this scenario is 802.1q. This standard is used to support VLAN tags on an Ethernet switch. It allows a single physical port to support multiple VLANs and can therefore accommodate multiple distribution systems using only one IP address on the WLC.