Link Aggregation Group Operation Modes

Answer - C.

The AWS documentation mentions the following.

All LAGs have an attribute that determines the minimum number of connections in the LAG that must be operational for the LAG itself to be operational.

By default, new LAGs have this attribute set to 0

You can update your LAG to specify a different value-doing so means that your entire LAG becomes non-operational if the number of operational connections falls below this threshold.

This attribute can be used to prevent over-utilization of the remaining connections.

All connections in a LAG operate in Active/Active mode.

For more information on link aggregation group , please refer to the below link:

http://docs.aws.amazon.com/directconnect/latest/UserGuide/lags.html

In a Link Aggregation Group (LAG), multiple physical network connections are combined into a single logical interface to increase bandwidth and provide redundancy. The mode in which connections in a LAG operate is determined by the LAG protocol used.

There are primarily two LAG protocols used:

1. Link Aggregation Control Protocol (LACP) - is a standards-based protocol that allows automatic negotiation and configuration of LAGs between network devices.

2. Static LAG (SLAG) - where the LAG configuration is manually set and does not support automatic negotiation.

Based on these protocols, there are mainly two modes in which connections in a LAG operate: Active/Passive and Active/Active.

A. Active/Passive mode: In Active/Passive mode, the LACP-enabled device actively sends LACP packets to negotiate and form LAGs, while the non-LACP device responds passively to the LACP packets. This mode is also known as LACP Passive mode.

B. Passive/Active mode: In Passive/Active mode, the LACP-enabled device responds passively to the LACP packets, while the non-LACP device actively sends LACP packets to negotiate and form LAGs. This mode is also known as LACP Active mode.

C. Active/Active mode: In Active/Active mode, both devices are LACP-enabled and actively send LACP packets to negotiate and form LAGs. This mode is also known as LACP Active mode with multiple aggregators.

D. Passive/Passive mode: Passive/Passive mode is not a valid mode in LAG.

In summary, the mode in which connections in a LAG operate is determined by the LAG protocol used. Active/Passive and Active/Active are the two valid modes, while Passive/Passive mode is not a valid mode.