Switch Ports

Switch ports can be configured to allow traffic from multiple VLANs. These ports are called trunk ports or tagged ports. Which of these is NOT a key points about trunk ports.

• • The traffic on a trunk port is kept separate through identifying tags.

• • Each tag identifies the VLAN the packet came from.

• • The tags are placed in the header each time the packet reaches a new switch in the network.

• • This tagging system is labeled 802.1ax by the IEEE.

Link aggregation is incorporating multiple links together to act as a single port. Which of these does link aggregation FAIL to do:

• • Is designated 802.1AX by IEEE.

• Decrease bandwidth to the cumulative total of each of the combined links. Costing money.

• Typically uses Link Aggregation Protocol (LACP).

• • Creates a seamless redundancy if a link fails.

LACP works as follows:

• • Both ends of the connection need LACP enabled.

• • Both devices automatically combine the multiple links between them as a single logical link.

• • If one of the links fails, LACP automatically load balances without interruption of connectivity.

• You can't configure active or passive mode.

LACP mode:
Is typically the preferred mode.

• Puts the interface into an unconditional negotiating state.

• Sends frames automatically.

• Active

• Passive

LACP mode:
Is the default mode.

• Will respond only to received frames.

• Will never initiate negotiations.

• Active

• Passive

Auto-negotiation is a default setting of Ethernet devices in which connected devices communicate to select the speed, duplex parameter, and flow control parameter for transmissions.

Duplex options are:

• Full duplex

• Half duplex

• Auto-negotiation

• Flow Control

Auto-negotiation speed options are all but:

• 10 Mbps

• 100 Mbps

• 1000 Mbps

• 1 Mbps

Flow control is a configuration that sends a pause frame to the transmitting devices when the receiving device cannot keep up with the volume of data being sent. Flow control does what?

• Prevents packet loss

• Adjust speeds

• Allows to transmit and receive at the same time

• Is an 802.1q IEEE standard

802.1q by IEEE is

• Port Tagging

• Link Aggregation Control Protocol (LACP)

• Jumbo Frames

• Flow Control

802.1AX by IEEE is

• Port Tagging

• Link Aggregation Control Protocol (LACP)

• Jumbo Frames

• Flow Control