A Linux administrator is troubleshooting a server with two network interfaces, eth0 and eth1, configured as a bonded interface named bond0. The server is connected to a basic, unmanaged network switch. Users report slow performance and intermittent connection drops to the server. The administrator inspects the bonding configuration file and finds the line BONDING_OPTS="mode=802.3ad miimon=100". What is the most likely cause of the network issues?
The miimon=100 setting is too aggressive and is causing false link-down events.
The Maximum Transmission Unit (MTU) is mismatched between the bond0 interface and the slave interfaces.
The server should be configured in active-backup mode, which has better performance than 802.3ad.
The 802.3ad mode requires Link Aggregation Control Protocol (LACP) support on the switch, which an unmanaged switch cannot provide.
The correct answer is that the 802.3ad bonding mode requires switch-side configuration, which is not available on an unmanaged switch. Mode 4, or 802.3ad, uses the Link Aggregation Control Protocol (LACP) to negotiate the link aggregation with the switch. An unmanaged switch does not support LACP, leading to improper link behavior, packet loss, and intermittent connectivity.
The active-backup mode is a suitable alternative for this setup as it provides fault tolerance without requiring any special switch configuration. The miimon=100 parameter is a standard setting for link monitoring and is not the cause of the issue. A Maximum Transmission Unit (MTU) mismatch could cause issues, but the primary and most evident problem in this scenario is the incompatibility between the bonding mode and the switch hardware.
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